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Grouping in React Grid component

The Grid has options to group records by dragging and dropping the column header to the group drop area. When grouping is applied, grid records are organized into a hierarchical structure to facilitate easier expansion and collapse of records.

To enable grouping in the grid, set the allowGrouping as true. Grouping options can be configured through the groupSettings.

To Group, inject Group module in the grid.

Source
Preview
App.tsx
datasource.tsx
import { ColumnDirective, ColumnsDirective, GridComponent, Group, Inject } from '@syncfusion/ej2-react-grids';
import * as React from 'react';
import { data } from './datasource';

export default class App extends React.Component<{}, {}>{
  public render(){
    return <GridComponent  dataSource={data} allowGrouping={true} height={267}>
              <ColumnsDirective>
                <ColumnDirective field='OrderID' headerText='Order ID' width='120' textAlign="Right"/>
                <ColumnDirective field='CustomerID' headerText='Customer ID' width='150'/>
                <ColumnDirective field='ShipCity' headerText='Ship City' width='150'/>
                <ColumnDirective field='ShipName' headerText='Ship Name' width='150'/>
            </ColumnsDirective>
            <Inject services={[Group]}/>
        </GridComponent >
    }
};
export let employeeData: Object[] = [{
    'EmployeeID': 1,
    'LastName': 'Davolio',
    'FirstName': 'Nancy',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-664743600000),
    'HireDate': new Date(704692800000),
    'Address': '507 - 20th Ave. E.\r\nApt. 2A',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98122',
    'Country': 'USA',
    'HomePhone': '(206) 555-9857',
    'Extension': '5467',
    'Photo': { 'Length': 21626 },

    'Notes': 'Education includes a BA in psychology from Colorado State University in 1970.  She also completed\
    \'The Art of the Cold Call.\'  Nancy is a member of Toastmasters International.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 2,
    'LastName': 'Fuller',
    'FirstName': 'Andrew',
    'Title': 'Vice President, Sales',
    'TitleOfCourtesy': 'Dr.',
    'BirthDate': new Date(-563828400000),
    'HireDate': new Date(713764800000),
    'Address': '908 W. Capital Way',
    'City': 'Tacoma',
    'Region': 'WA',
    'PostalCode': '98401',
    'Country': 'USA',
    'HomePhone': '(206) 555-9482',
    'Extension': '3457',
    'Photo': { 'Length': 21626 },

    'Notes': 'Andrew received his BTS commercial in 1974 and a Ph.D. in international marketing from the University of \
    Dallas in 1981.  He is fluent in French and Italian and reads German.  He joined the company as a sales representative, \
    was promoted to sales manager in January 1992 and to vice president of sales in March 1993.  Andrew is a member of the \
    Sales Management Roundtable, the Seattle Chamber of Commerce, and the Pacific Rim Importers Association.',
    'ReportsTo': 0,
    'PhotoPath': 'http://accweb/emmployees/fuller.bmp'
},
{
    'EmployeeID': 3,
    'LastName': 'Leverling',
    'FirstName': 'Janet',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-200088000000),
    'HireDate': new Date(702104400000),
    'Address': '722 Moss Bay Blvd.',
    'City': 'Kirkland',
    'Region': 'WA',
    'PostalCode': '98033',
    'Country': 'USA',
    'HomePhone': '(206) 555-3412',
    'Extension': '3355',
    'Photo': { 'Length': 21722 },

    'Notes': 'Janet has a BS degree in chemistry from Boston College (1984). \
     She has also completed a certificate program in food retailing management.\
     Janet was hired as a sales associate in 1991 and promoted to sales representative in February 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/leverling.bmp'
},
{
    'EmployeeID': 4,
    'LastName': 'Peacock',
    'FirstName': 'Margaret',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mrs.',
    'BirthDate': new Date(-1018814400000),
    'HireDate': new Date(736401600000),
    'Address': '4110 Old Redmond Rd.',
    'City': 'Redmond',
    'Region': 'WA',
    'PostalCode': '98052',
    'Country': 'USA',
    'HomePhone': '(206) 555-8122',
    'Extension': '5176',
    'Photo': { 'Length': 21626 },

    'Notes': 'Margaret holds a BA in English literature from Concordia College (1958) and an MA from the American \
    Institute of Culinary Arts (1966).  She was assigned to the London office temporarily from July through November 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/peacock.bmp'
},
{
    'EmployeeID': 5,
    'LastName': 'Buchanan',
    'FirstName': 'Steven',
    'Title': 'Sales Manager',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-468010800000),
    'HireDate': new Date(750830400000),
    'Address': '14 Garrett Hill',
    'City': 'London',
    'Region': null,
    'PostalCode':
    'SW1 8JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-4848',
    'Extension': '3453',
    'Photo': { 'Length': 21626 },

    'Notes': 'Steven Buchanan graduated from St. Andrews University, Scotland, with a BSC degree in 1976.  Upon joining the company as \
    a sales representative in 1992, he spent 6 months in an orientation program at the Seattle office and then returned to his permanent \
    post in London.  He was promoted to sales manager in March 1993.  Mr. Buchanan has completed the courses \'Successful \
    Telemarketing\' and \'International Sales Management.\'  He is fluent in French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/buchanan.bmp'
},
{
    'EmployeeID': 6,
    'LastName': 'Suyama',
    'FirstName': 'Michael',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-205185600000),
    'HireDate': new Date(750830400000),
    'Address': 'Coventry House\r\nMiner Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'EC2 7JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-7773',
    'Extension': '428',
    'Photo': { 'Length': 21626 },

    'Notes': 'Michael is a graduate of Sussex University (MA, economics, 1983) and the University of California at Los Angeles \
    (MBA, marketing, 1986).  He has also taken the courses \'Multi-Cultural Selling\' and \'Time Management for the Sales Professional.\'  \
    He is fluent in Japanese and can read and write French, Portuguese, and Spanish.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 7,
    'LastName': 'King',
    'FirstName': 'Robert',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-302731200000),
    'HireDate': new Date(757486800000),
    'Address': 'Edgeham Hollow\r\nWinchester Way',
    'City': 'London',
    'Region': null,
    'PostalCode': 'RG1 9SP',
    'Country': 'UK',
    'HomePhone': '(71) 555-5598',
    'Extension': '465',
    'Photo': { 'Length': 21626 },

    'Notes': 'Robert King served in the Peace Corps and traveled extensively before completing his degree in English at the \
    University of Michigan in 1992, the year he joined the company.  After completing a course entitled \'Selling in Europe,\' \
    he was transferred to the London office in March 1993.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 8,
    'LastName': 'Callahan',
    'FirstName': 'Laura',
    'Title': 'Inside Sales Coordinator',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-377982000000),
    'HireDate': new Date(762843600000),
    'Address': '4726 - 11th Ave. N.E.',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98105',
    'Country': 'USA',
    'HomePhone': '(206) 555-1189',
    'Extension': '2344',
    'Photo': { 'Length': 21626 },

    'Notes': 'Laura received a BA in psychology from the University of Washington.  She has also completed a course in business \
    French.  She reads and writes French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 9,
    'LastName': 'Dodsworth',
    'FirstName': 'Anne',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-123966000000),
    'HireDate': new Date(784875600000),
    'Address': '7 Houndstooth Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'WG2 7LT',
    'Country': 'UK',
    'HomePhone': '(71) 555-4444',
    'Extension': '452',
    'Photo': { 'Length': 21626 },

    'Notes': 'Anne has a BA degree in English from St. Lawrence College.  She is fluent in French and German.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
}];


export let data: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'France', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Switzerland', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    },
    {
        OrderID: 10256, CustomerID: 'WELLI', EmployeeID: 3, OrderDate: new Date(837369e6),
        ShipName: 'Wellington Importadora', ShipCity: 'Resende', ShipAddress: 'Rua do Mercado, 12',
        ShipRegion: 'SP', ShipPostalCode: '08737-363', ShipCountry: 'Brazil', Freight: 13.97, Verified: !1
    },
    {
        OrderID: 10257, CustomerID: 'HILAA', EmployeeID: 4, OrderDate: new Date(8374554e5),
        ShipName: 'HILARION-Abastos', ShipCity: 'San Cristóbal', ShipAddress: 'Carrera 22 con Ave. Carlos Soublette #8-35',
        ShipRegion: 'Táchira', ShipPostalCode: '5022', ShipCountry: 'Venezuela', Freight: 81.91, Verified: !0
    },
    {
        OrderID: 10258, CustomerID: 'ERNSH', EmployeeID: 1, OrderDate: new Date(8375418e5),
        ShipName: 'Ernst Handel', ShipCity: 'Graz', ShipAddress: 'Kirchgasse 6',
        ShipRegion: 'CJ', ShipPostalCode: '8010', ShipCountry: 'Austria', Freight: 140.51, Verified: !0
    },
    {
        OrderID: 10259, CustomerID: 'CENTC', EmployeeID: 4, OrderDate: new Date(8376282e5),
        ShipName: 'Centro comercial Moctezuma', ShipCity: 'México D.F.', ShipAddress: 'Sierras de Granada 9993',
        ShipRegion: 'CJ', ShipPostalCode: '05022', ShipCountry: 'Mexico', Freight: 3.25, Verified: !1
    },
    {
        OrderID: 10260, CustomerID: 'OTTIK', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Ottilies Käseladen', ShipCity: 'Köln', ShipAddress: 'Mehrheimerstr. 369',
        ShipRegion: 'CJ', ShipPostalCode: '50739', ShipCountry: 'Germany', Freight: 55.09, Verified: !0
    },
    {
        OrderID: 10261, CustomerID: 'QUEDE', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Que Delícia', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua da Panificadora, 12',
        ShipRegion: 'RJ', ShipPostalCode: '02389-673', ShipCountry: 'Brazil', Freight: 3.05, Verified: !1
    },
    {
        OrderID: 10262, CustomerID: 'RATTC', EmployeeID: 8, OrderDate: new Date(8379738e5),
        ShipName: 'Rattlesnake Canyon Grocery', ShipCity: 'Albuquerque', ShipAddress: '2817 Milton Dr.',
        ShipRegion: 'NM', ShipPostalCode: '87110', ShipCountry: 'USA', Freight: 48.29, Verified: !0
    }];

export let sdata: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'Brazil', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Brazil', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    }];

Initial group

To apply group at initial rendering, set the column field name in the groupSettings.columns.

Source
Preview
App.tsx
datasource.tsx
import { ColumnDirective, ColumnsDirective, GridComponent, Group, GroupSettingsModel, Inject } from '@syncfusion/ej2-react-grids';
import * as React from 'react';
import { data } from './datasource';

export default class App extends React.Component<{}, {}>{
  public groupOptions : GroupSettingsModel = {
    columns: ['CustomerID', 'ShipCity']
  };

  public render(){
      return <GridComponent  dataSource={data} allowGrouping={true} groupSettings={this.groupOptions} height={267}>
                <ColumnsDirective>
                  <ColumnDirective field='OrderID' headerText='Order ID' width='120' textAlign="Right"/>
                  <ColumnDirective field='CustomerID' headerText='Customer ID' width='150'/>
                  <ColumnDirective field='ShipCity' headerText='Ship City' width='150'/>
                  <ColumnDirective field='ShipName' headerText='Ship Name' width='150'/>
              </ColumnsDirective>
              <Inject services={[Group]}/>
          </GridComponent >
      }
};
export let employeeData: Object[] = [{
    'EmployeeID': 1,
    'LastName': 'Davolio',
    'FirstName': 'Nancy',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-664743600000),
    'HireDate': new Date(704692800000),
    'Address': '507 - 20th Ave. E.\r\nApt. 2A',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98122',
    'Country': 'USA',
    'HomePhone': '(206) 555-9857',
    'Extension': '5467',
    'Photo': { 'Length': 21626 },

    'Notes': 'Education includes a BA in psychology from Colorado State University in 1970.  She also completed\
    \'The Art of the Cold Call.\'  Nancy is a member of Toastmasters International.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 2,
    'LastName': 'Fuller',
    'FirstName': 'Andrew',
    'Title': 'Vice President, Sales',
    'TitleOfCourtesy': 'Dr.',
    'BirthDate': new Date(-563828400000),
    'HireDate': new Date(713764800000),
    'Address': '908 W. Capital Way',
    'City': 'Tacoma',
    'Region': 'WA',
    'PostalCode': '98401',
    'Country': 'USA',
    'HomePhone': '(206) 555-9482',
    'Extension': '3457',
    'Photo': { 'Length': 21626 },

    'Notes': 'Andrew received his BTS commercial in 1974 and a Ph.D. in international marketing from the University of \
    Dallas in 1981.  He is fluent in French and Italian and reads German.  He joined the company as a sales representative, \
    was promoted to sales manager in January 1992 and to vice president of sales in March 1993.  Andrew is a member of the \
    Sales Management Roundtable, the Seattle Chamber of Commerce, and the Pacific Rim Importers Association.',
    'ReportsTo': 0,
    'PhotoPath': 'http://accweb/emmployees/fuller.bmp'
},
{
    'EmployeeID': 3,
    'LastName': 'Leverling',
    'FirstName': 'Janet',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-200088000000),
    'HireDate': new Date(702104400000),
    'Address': '722 Moss Bay Blvd.',
    'City': 'Kirkland',
    'Region': 'WA',
    'PostalCode': '98033',
    'Country': 'USA',
    'HomePhone': '(206) 555-3412',
    'Extension': '3355',
    'Photo': { 'Length': 21722 },

    'Notes': 'Janet has a BS degree in chemistry from Boston College (1984). \
     She has also completed a certificate program in food retailing management.\
     Janet was hired as a sales associate in 1991 and promoted to sales representative in February 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/leverling.bmp'
},
{
    'EmployeeID': 4,
    'LastName': 'Peacock',
    'FirstName': 'Margaret',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mrs.',
    'BirthDate': new Date(-1018814400000),
    'HireDate': new Date(736401600000),
    'Address': '4110 Old Redmond Rd.',
    'City': 'Redmond',
    'Region': 'WA',
    'PostalCode': '98052',
    'Country': 'USA',
    'HomePhone': '(206) 555-8122',
    'Extension': '5176',
    'Photo': { 'Length': 21626 },

    'Notes': 'Margaret holds a BA in English literature from Concordia College (1958) and an MA from the American \
    Institute of Culinary Arts (1966).  She was assigned to the London office temporarily from July through November 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/peacock.bmp'
},
{
    'EmployeeID': 5,
    'LastName': 'Buchanan',
    'FirstName': 'Steven',
    'Title': 'Sales Manager',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-468010800000),
    'HireDate': new Date(750830400000),
    'Address': '14 Garrett Hill',
    'City': 'London',
    'Region': null,
    'PostalCode':
    'SW1 8JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-4848',
    'Extension': '3453',
    'Photo': { 'Length': 21626 },

    'Notes': 'Steven Buchanan graduated from St. Andrews University, Scotland, with a BSC degree in 1976.  Upon joining the company as \
    a sales representative in 1992, he spent 6 months in an orientation program at the Seattle office and then returned to his permanent \
    post in London.  He was promoted to sales manager in March 1993.  Mr. Buchanan has completed the courses \'Successful \
    Telemarketing\' and \'International Sales Management.\'  He is fluent in French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/buchanan.bmp'
},
{
    'EmployeeID': 6,
    'LastName': 'Suyama',
    'FirstName': 'Michael',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-205185600000),
    'HireDate': new Date(750830400000),
    'Address': 'Coventry House\r\nMiner Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'EC2 7JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-7773',
    'Extension': '428',
    'Photo': { 'Length': 21626 },

    'Notes': 'Michael is a graduate of Sussex University (MA, economics, 1983) and the University of California at Los Angeles \
    (MBA, marketing, 1986).  He has also taken the courses \'Multi-Cultural Selling\' and \'Time Management for the Sales Professional.\'  \
    He is fluent in Japanese and can read and write French, Portuguese, and Spanish.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 7,
    'LastName': 'King',
    'FirstName': 'Robert',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-302731200000),
    'HireDate': new Date(757486800000),
    'Address': 'Edgeham Hollow\r\nWinchester Way',
    'City': 'London',
    'Region': null,
    'PostalCode': 'RG1 9SP',
    'Country': 'UK',
    'HomePhone': '(71) 555-5598',
    'Extension': '465',
    'Photo': { 'Length': 21626 },

    'Notes': 'Robert King served in the Peace Corps and traveled extensively before completing his degree in English at the \
    University of Michigan in 1992, the year he joined the company.  After completing a course entitled \'Selling in Europe,\' \
    he was transferred to the London office in March 1993.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 8,
    'LastName': 'Callahan',
    'FirstName': 'Laura',
    'Title': 'Inside Sales Coordinator',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-377982000000),
    'HireDate': new Date(762843600000),
    'Address': '4726 - 11th Ave. N.E.',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98105',
    'Country': 'USA',
    'HomePhone': '(206) 555-1189',
    'Extension': '2344',
    'Photo': { 'Length': 21626 },

    'Notes': 'Laura received a BA in psychology from the University of Washington.  She has also completed a course in business \
    French.  She reads and writes French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 9,
    'LastName': 'Dodsworth',
    'FirstName': 'Anne',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-123966000000),
    'HireDate': new Date(784875600000),
    'Address': '7 Houndstooth Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'WG2 7LT',
    'Country': 'UK',
    'HomePhone': '(71) 555-4444',
    'Extension': '452',
    'Photo': { 'Length': 21626 },

    'Notes': 'Anne has a BA degree in English from St. Lawrence College.  She is fluent in French and German.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
}];


export let data: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'France', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Switzerland', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    },
    {
        OrderID: 10256, CustomerID: 'WELLI', EmployeeID: 3, OrderDate: new Date(837369e6),
        ShipName: 'Wellington Importadora', ShipCity: 'Resende', ShipAddress: 'Rua do Mercado, 12',
        ShipRegion: 'SP', ShipPostalCode: '08737-363', ShipCountry: 'Brazil', Freight: 13.97, Verified: !1
    },
    {
        OrderID: 10257, CustomerID: 'HILAA', EmployeeID: 4, OrderDate: new Date(8374554e5),
        ShipName: 'HILARION-Abastos', ShipCity: 'San Cristóbal', ShipAddress: 'Carrera 22 con Ave. Carlos Soublette #8-35',
        ShipRegion: 'Táchira', ShipPostalCode: '5022', ShipCountry: 'Venezuela', Freight: 81.91, Verified: !0
    },
    {
        OrderID: 10258, CustomerID: 'ERNSH', EmployeeID: 1, OrderDate: new Date(8375418e5),
        ShipName: 'Ernst Handel', ShipCity: 'Graz', ShipAddress: 'Kirchgasse 6',
        ShipRegion: 'CJ', ShipPostalCode: '8010', ShipCountry: 'Austria', Freight: 140.51, Verified: !0
    },
    {
        OrderID: 10259, CustomerID: 'CENTC', EmployeeID: 4, OrderDate: new Date(8376282e5),
        ShipName: 'Centro comercial Moctezuma', ShipCity: 'México D.F.', ShipAddress: 'Sierras de Granada 9993',
        ShipRegion: 'CJ', ShipPostalCode: '05022', ShipCountry: 'Mexico', Freight: 3.25, Verified: !1
    },
    {
        OrderID: 10260, CustomerID: 'OTTIK', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Ottilies Käseladen', ShipCity: 'Köln', ShipAddress: 'Mehrheimerstr. 369',
        ShipRegion: 'CJ', ShipPostalCode: '50739', ShipCountry: 'Germany', Freight: 55.09, Verified: !0
    },
    {
        OrderID: 10261, CustomerID: 'QUEDE', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Que Delícia', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua da Panificadora, 12',
        ShipRegion: 'RJ', ShipPostalCode: '02389-673', ShipCountry: 'Brazil', Freight: 3.05, Verified: !1
    },
    {
        OrderID: 10262, CustomerID: 'RATTC', EmployeeID: 8, OrderDate: new Date(8379738e5),
        ShipName: 'Rattlesnake Canyon Grocery', ShipCity: 'Albuquerque', ShipAddress: '2817 Milton Dr.',
        ShipRegion: 'NM', ShipPostalCode: '87110', ShipCountry: 'USA', Freight: 48.29, Verified: !0
    }];

export let sdata: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'Brazil', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Brazil', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    }];

Caption Template

You can customize the group caption by using the groupSettings.captionTemplate property.

Source
Preview
App.tsx
datasource.tsx
import { ColumnDirective, ColumnsDirective, GridComponent, Group, GroupSettingsModel, Inject } from '@syncfusion/ej2-react-grids';
import * as React from 'react';
import { data } from './datasource';

export default class App extends React.Component<{}, {}>{
  public groupOptions : GroupSettingsModel = {
    columns: ['CustomerID', 'ShipCity'],
    showDropArea: false,
    captionTemplate: '<span class="groupItems" style="color:blue"> ${field} - ${count} Items</span>'
  };

  public render(){
      return <GridComponent  dataSource={data} allowGrouping={true} groupSettings={this.groupOptions} height={267}>
                <ColumnsDirective>
                  <ColumnDirective field='OrderID' headerText='Order ID' width='120' textAlign="Right"/>
                  <ColumnDirective field='CustomerID' headerText='Customer ID' width='150'/>
                  <ColumnDirective field='ShipCity' headerText='Ship City' width='150'/>
                  <ColumnDirective field='ShipName' headerText='Ship Name' width='150'/>
              </ColumnsDirective>
              <Inject services={[Group]}/>
          </GridComponent >
      }
};
export let employeeData: Object[] = [{
    'EmployeeID': 1,
    'LastName': 'Davolio',
    'FirstName': 'Nancy',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-664743600000),
    'HireDate': new Date(704692800000),
    'Address': '507 - 20th Ave. E.\r\nApt. 2A',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98122',
    'Country': 'USA',
    'HomePhone': '(206) 555-9857',
    'Extension': '5467',
    'Photo': { 'Length': 21626 },

    'Notes': 'Education includes a BA in psychology from Colorado State University in 1970.  She also completed\
    \'The Art of the Cold Call.\'  Nancy is a member of Toastmasters International.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 2,
    'LastName': 'Fuller',
    'FirstName': 'Andrew',
    'Title': 'Vice President, Sales',
    'TitleOfCourtesy': 'Dr.',
    'BirthDate': new Date(-563828400000),
    'HireDate': new Date(713764800000),
    'Address': '908 W. Capital Way',
    'City': 'Tacoma',
    'Region': 'WA',
    'PostalCode': '98401',
    'Country': 'USA',
    'HomePhone': '(206) 555-9482',
    'Extension': '3457',
    'Photo': { 'Length': 21626 },

    'Notes': 'Andrew received his BTS commercial in 1974 and a Ph.D. in international marketing from the University of \
    Dallas in 1981.  He is fluent in French and Italian and reads German.  He joined the company as a sales representative, \
    was promoted to sales manager in January 1992 and to vice president of sales in March 1993.  Andrew is a member of the \
    Sales Management Roundtable, the Seattle Chamber of Commerce, and the Pacific Rim Importers Association.',
    'ReportsTo': 0,
    'PhotoPath': 'http://accweb/emmployees/fuller.bmp'
},
{
    'EmployeeID': 3,
    'LastName': 'Leverling',
    'FirstName': 'Janet',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-200088000000),
    'HireDate': new Date(702104400000),
    'Address': '722 Moss Bay Blvd.',
    'City': 'Kirkland',
    'Region': 'WA',
    'PostalCode': '98033',
    'Country': 'USA',
    'HomePhone': '(206) 555-3412',
    'Extension': '3355',
    'Photo': { 'Length': 21722 },

    'Notes': 'Janet has a BS degree in chemistry from Boston College (1984). \
     She has also completed a certificate program in food retailing management.\
     Janet was hired as a sales associate in 1991 and promoted to sales representative in February 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/leverling.bmp'
},
{
    'EmployeeID': 4,
    'LastName': 'Peacock',
    'FirstName': 'Margaret',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mrs.',
    'BirthDate': new Date(-1018814400000),
    'HireDate': new Date(736401600000),
    'Address': '4110 Old Redmond Rd.',
    'City': 'Redmond',
    'Region': 'WA',
    'PostalCode': '98052',
    'Country': 'USA',
    'HomePhone': '(206) 555-8122',
    'Extension': '5176',
    'Photo': { 'Length': 21626 },

    'Notes': 'Margaret holds a BA in English literature from Concordia College (1958) and an MA from the American \
    Institute of Culinary Arts (1966).  She was assigned to the London office temporarily from July through November 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/peacock.bmp'
},
{
    'EmployeeID': 5,
    'LastName': 'Buchanan',
    'FirstName': 'Steven',
    'Title': 'Sales Manager',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-468010800000),
    'HireDate': new Date(750830400000),
    'Address': '14 Garrett Hill',
    'City': 'London',
    'Region': null,
    'PostalCode':
    'SW1 8JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-4848',
    'Extension': '3453',
    'Photo': { 'Length': 21626 },

    'Notes': 'Steven Buchanan graduated from St. Andrews University, Scotland, with a BSC degree in 1976.  Upon joining the company as \
    a sales representative in 1992, he spent 6 months in an orientation program at the Seattle office and then returned to his permanent \
    post in London.  He was promoted to sales manager in March 1993.  Mr. Buchanan has completed the courses \'Successful \
    Telemarketing\' and \'International Sales Management.\'  He is fluent in French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/buchanan.bmp'
},
{
    'EmployeeID': 6,
    'LastName': 'Suyama',
    'FirstName': 'Michael',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-205185600000),
    'HireDate': new Date(750830400000),
    'Address': 'Coventry House\r\nMiner Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'EC2 7JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-7773',
    'Extension': '428',
    'Photo': { 'Length': 21626 },

    'Notes': 'Michael is a graduate of Sussex University (MA, economics, 1983) and the University of California at Los Angeles \
    (MBA, marketing, 1986).  He has also taken the courses \'Multi-Cultural Selling\' and \'Time Management for the Sales Professional.\'  \
    He is fluent in Japanese and can read and write French, Portuguese, and Spanish.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 7,
    'LastName': 'King',
    'FirstName': 'Robert',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-302731200000),
    'HireDate': new Date(757486800000),
    'Address': 'Edgeham Hollow\r\nWinchester Way',
    'City': 'London',
    'Region': null,
    'PostalCode': 'RG1 9SP',
    'Country': 'UK',
    'HomePhone': '(71) 555-5598',
    'Extension': '465',
    'Photo': { 'Length': 21626 },

    'Notes': 'Robert King served in the Peace Corps and traveled extensively before completing his degree in English at the \
    University of Michigan in 1992, the year he joined the company.  After completing a course entitled \'Selling in Europe,\' \
    he was transferred to the London office in March 1993.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 8,
    'LastName': 'Callahan',
    'FirstName': 'Laura',
    'Title': 'Inside Sales Coordinator',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-377982000000),
    'HireDate': new Date(762843600000),
    'Address': '4726 - 11th Ave. N.E.',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98105',
    'Country': 'USA',
    'HomePhone': '(206) 555-1189',
    'Extension': '2344',
    'Photo': { 'Length': 21626 },

    'Notes': 'Laura received a BA in psychology from the University of Washington.  She has also completed a course in business \
    French.  She reads and writes French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 9,
    'LastName': 'Dodsworth',
    'FirstName': 'Anne',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-123966000000),
    'HireDate': new Date(784875600000),
    'Address': '7 Houndstooth Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'WG2 7LT',
    'Country': 'UK',
    'HomePhone': '(71) 555-4444',
    'Extension': '452',
    'Photo': { 'Length': 21626 },

    'Notes': 'Anne has a BA degree in English from St. Lawrence College.  She is fluent in French and German.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
}];


export let data: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'France', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Switzerland', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    },
    {
        OrderID: 10256, CustomerID: 'WELLI', EmployeeID: 3, OrderDate: new Date(837369e6),
        ShipName: 'Wellington Importadora', ShipCity: 'Resende', ShipAddress: 'Rua do Mercado, 12',
        ShipRegion: 'SP', ShipPostalCode: '08737-363', ShipCountry: 'Brazil', Freight: 13.97, Verified: !1
    },
    {
        OrderID: 10257, CustomerID: 'HILAA', EmployeeID: 4, OrderDate: new Date(8374554e5),
        ShipName: 'HILARION-Abastos', ShipCity: 'San Cristóbal', ShipAddress: 'Carrera 22 con Ave. Carlos Soublette #8-35',
        ShipRegion: 'Táchira', ShipPostalCode: '5022', ShipCountry: 'Venezuela', Freight: 81.91, Verified: !0
    },
    {
        OrderID: 10258, CustomerID: 'ERNSH', EmployeeID: 1, OrderDate: new Date(8375418e5),
        ShipName: 'Ernst Handel', ShipCity: 'Graz', ShipAddress: 'Kirchgasse 6',
        ShipRegion: 'CJ', ShipPostalCode: '8010', ShipCountry: 'Austria', Freight: 140.51, Verified: !0
    },
    {
        OrderID: 10259, CustomerID: 'CENTC', EmployeeID: 4, OrderDate: new Date(8376282e5),
        ShipName: 'Centro comercial Moctezuma', ShipCity: 'México D.F.', ShipAddress: 'Sierras de Granada 9993',
        ShipRegion: 'CJ', ShipPostalCode: '05022', ShipCountry: 'Mexico', Freight: 3.25, Verified: !1
    },
    {
        OrderID: 10260, CustomerID: 'OTTIK', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Ottilies Käseladen', ShipCity: 'Köln', ShipAddress: 'Mehrheimerstr. 369',
        ShipRegion: 'CJ', ShipPostalCode: '50739', ShipCountry: 'Germany', Freight: 55.09, Verified: !0
    },
    {
        OrderID: 10261, CustomerID: 'QUEDE', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Que Delícia', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua da Panificadora, 12',
        ShipRegion: 'RJ', ShipPostalCode: '02389-673', ShipCountry: 'Brazil', Freight: 3.05, Verified: !1
    },
    {
        OrderID: 10262, CustomerID: 'RATTC', EmployeeID: 8, OrderDate: new Date(8379738e5),
        ShipName: 'Rattlesnake Canyon Grocery', ShipCity: 'Albuquerque', ShipAddress: '2817 Milton Dr.',
        ShipRegion: 'NM', ShipPostalCode: '87110', ShipCountry: 'USA', Freight: 48.29, Verified: !0
    }];

export let sdata: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'Brazil', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Brazil', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    }];

Hide drop area

To avoid ungrouping or further grouping of a column after initial column grouping, define the groupSettings.showDropArea as false.

Source
Preview
App.tsx
datasource.tsx
import { ColumnDirective, ColumnsDirective, GridComponent, Group, GroupSettingsModel, Inject } from '@syncfusion/ej2-react-grids';
import * as React from 'react';
import { data } from './datasource';

export default class App extends React.Component<{}, {}>{
  public groupOptions : GroupSettingsModel = {
    columns: ['CustomerID', 'ShipCity'],
    showDropArea: false
  };

  public render(){
      return <GridComponent  dataSource={data} allowGrouping={true} groupSettings={this.groupOptions} height={267}>
                <ColumnsDirective>
                  <ColumnDirective field='OrderID' headerText='Order ID' width='120' textAlign="Right"/>
                  <ColumnDirective field='CustomerID' headerText='Customer ID' width='150'/>
                  <ColumnDirective field='ShipCity' headerText='Ship City' width='150'/>
                  <ColumnDirective field='ShipName' headerText='Ship Name' width='150'/>
              </ColumnsDirective>
              <Inject services={[Group]}/>
          </GridComponent >
      }
};
export let employeeData: Object[] = [{
    'EmployeeID': 1,
    'LastName': 'Davolio',
    'FirstName': 'Nancy',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-664743600000),
    'HireDate': new Date(704692800000),
    'Address': '507 - 20th Ave. E.\r\nApt. 2A',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98122',
    'Country': 'USA',
    'HomePhone': '(206) 555-9857',
    'Extension': '5467',
    'Photo': { 'Length': 21626 },

    'Notes': 'Education includes a BA in psychology from Colorado State University in 1970.  She also completed\
    \'The Art of the Cold Call.\'  Nancy is a member of Toastmasters International.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 2,
    'LastName': 'Fuller',
    'FirstName': 'Andrew',
    'Title': 'Vice President, Sales',
    'TitleOfCourtesy': 'Dr.',
    'BirthDate': new Date(-563828400000),
    'HireDate': new Date(713764800000),
    'Address': '908 W. Capital Way',
    'City': 'Tacoma',
    'Region': 'WA',
    'PostalCode': '98401',
    'Country': 'USA',
    'HomePhone': '(206) 555-9482',
    'Extension': '3457',
    'Photo': { 'Length': 21626 },

    'Notes': 'Andrew received his BTS commercial in 1974 and a Ph.D. in international marketing from the University of \
    Dallas in 1981.  He is fluent in French and Italian and reads German.  He joined the company as a sales representative, \
    was promoted to sales manager in January 1992 and to vice president of sales in March 1993.  Andrew is a member of the \
    Sales Management Roundtable, the Seattle Chamber of Commerce, and the Pacific Rim Importers Association.',
    'ReportsTo': 0,
    'PhotoPath': 'http://accweb/emmployees/fuller.bmp'
},
{
    'EmployeeID': 3,
    'LastName': 'Leverling',
    'FirstName': 'Janet',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-200088000000),
    'HireDate': new Date(702104400000),
    'Address': '722 Moss Bay Blvd.',
    'City': 'Kirkland',
    'Region': 'WA',
    'PostalCode': '98033',
    'Country': 'USA',
    'HomePhone': '(206) 555-3412',
    'Extension': '3355',
    'Photo': { 'Length': 21722 },

    'Notes': 'Janet has a BS degree in chemistry from Boston College (1984). \
     She has also completed a certificate program in food retailing management.\
     Janet was hired as a sales associate in 1991 and promoted to sales representative in February 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/leverling.bmp'
},
{
    'EmployeeID': 4,
    'LastName': 'Peacock',
    'FirstName': 'Margaret',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mrs.',
    'BirthDate': new Date(-1018814400000),
    'HireDate': new Date(736401600000),
    'Address': '4110 Old Redmond Rd.',
    'City': 'Redmond',
    'Region': 'WA',
    'PostalCode': '98052',
    'Country': 'USA',
    'HomePhone': '(206) 555-8122',
    'Extension': '5176',
    'Photo': { 'Length': 21626 },

    'Notes': 'Margaret holds a BA in English literature from Concordia College (1958) and an MA from the American \
    Institute of Culinary Arts (1966).  She was assigned to the London office temporarily from July through November 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/peacock.bmp'
},
{
    'EmployeeID': 5,
    'LastName': 'Buchanan',
    'FirstName': 'Steven',
    'Title': 'Sales Manager',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-468010800000),
    'HireDate': new Date(750830400000),
    'Address': '14 Garrett Hill',
    'City': 'London',
    'Region': null,
    'PostalCode':
    'SW1 8JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-4848',
    'Extension': '3453',
    'Photo': { 'Length': 21626 },

    'Notes': 'Steven Buchanan graduated from St. Andrews University, Scotland, with a BSC degree in 1976.  Upon joining the company as \
    a sales representative in 1992, he spent 6 months in an orientation program at the Seattle office and then returned to his permanent \
    post in London.  He was promoted to sales manager in March 1993.  Mr. Buchanan has completed the courses \'Successful \
    Telemarketing\' and \'International Sales Management.\'  He is fluent in French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/buchanan.bmp'
},
{
    'EmployeeID': 6,
    'LastName': 'Suyama',
    'FirstName': 'Michael',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-205185600000),
    'HireDate': new Date(750830400000),
    'Address': 'Coventry House\r\nMiner Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'EC2 7JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-7773',
    'Extension': '428',
    'Photo': { 'Length': 21626 },

    'Notes': 'Michael is a graduate of Sussex University (MA, economics, 1983) and the University of California at Los Angeles \
    (MBA, marketing, 1986).  He has also taken the courses \'Multi-Cultural Selling\' and \'Time Management for the Sales Professional.\'  \
    He is fluent in Japanese and can read and write French, Portuguese, and Spanish.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 7,
    'LastName': 'King',
    'FirstName': 'Robert',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-302731200000),
    'HireDate': new Date(757486800000),
    'Address': 'Edgeham Hollow\r\nWinchester Way',
    'City': 'London',
    'Region': null,
    'PostalCode': 'RG1 9SP',
    'Country': 'UK',
    'HomePhone': '(71) 555-5598',
    'Extension': '465',
    'Photo': { 'Length': 21626 },

    'Notes': 'Robert King served in the Peace Corps and traveled extensively before completing his degree in English at the \
    University of Michigan in 1992, the year he joined the company.  After completing a course entitled \'Selling in Europe,\' \
    he was transferred to the London office in March 1993.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 8,
    'LastName': 'Callahan',
    'FirstName': 'Laura',
    'Title': 'Inside Sales Coordinator',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-377982000000),
    'HireDate': new Date(762843600000),
    'Address': '4726 - 11th Ave. N.E.',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98105',
    'Country': 'USA',
    'HomePhone': '(206) 555-1189',
    'Extension': '2344',
    'Photo': { 'Length': 21626 },

    'Notes': 'Laura received a BA in psychology from the University of Washington.  She has also completed a course in business \
    French.  She reads and writes French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 9,
    'LastName': 'Dodsworth',
    'FirstName': 'Anne',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-123966000000),
    'HireDate': new Date(784875600000),
    'Address': '7 Houndstooth Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'WG2 7LT',
    'Country': 'UK',
    'HomePhone': '(71) 555-4444',
    'Extension': '452',
    'Photo': { 'Length': 21626 },

    'Notes': 'Anne has a BA degree in English from St. Lawrence College.  She is fluent in French and German.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
}];


export let data: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'France', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Switzerland', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    },
    {
        OrderID: 10256, CustomerID: 'WELLI', EmployeeID: 3, OrderDate: new Date(837369e6),
        ShipName: 'Wellington Importadora', ShipCity: 'Resende', ShipAddress: 'Rua do Mercado, 12',
        ShipRegion: 'SP', ShipPostalCode: '08737-363', ShipCountry: 'Brazil', Freight: 13.97, Verified: !1
    },
    {
        OrderID: 10257, CustomerID: 'HILAA', EmployeeID: 4, OrderDate: new Date(8374554e5),
        ShipName: 'HILARION-Abastos', ShipCity: 'San Cristóbal', ShipAddress: 'Carrera 22 con Ave. Carlos Soublette #8-35',
        ShipRegion: 'Táchira', ShipPostalCode: '5022', ShipCountry: 'Venezuela', Freight: 81.91, Verified: !0
    },
    {
        OrderID: 10258, CustomerID: 'ERNSH', EmployeeID: 1, OrderDate: new Date(8375418e5),
        ShipName: 'Ernst Handel', ShipCity: 'Graz', ShipAddress: 'Kirchgasse 6',
        ShipRegion: 'CJ', ShipPostalCode: '8010', ShipCountry: 'Austria', Freight: 140.51, Verified: !0
    },
    {
        OrderID: 10259, CustomerID: 'CENTC', EmployeeID: 4, OrderDate: new Date(8376282e5),
        ShipName: 'Centro comercial Moctezuma', ShipCity: 'México D.F.', ShipAddress: 'Sierras de Granada 9993',
        ShipRegion: 'CJ', ShipPostalCode: '05022', ShipCountry: 'Mexico', Freight: 3.25, Verified: !1
    },
    {
        OrderID: 10260, CustomerID: 'OTTIK', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Ottilies Käseladen', ShipCity: 'Köln', ShipAddress: 'Mehrheimerstr. 369',
        ShipRegion: 'CJ', ShipPostalCode: '50739', ShipCountry: 'Germany', Freight: 55.09, Verified: !0
    },
    {
        OrderID: 10261, CustomerID: 'QUEDE', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Que Delícia', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua da Panificadora, 12',
        ShipRegion: 'RJ', ShipPostalCode: '02389-673', ShipCountry: 'Brazil', Freight: 3.05, Verified: !1
    },
    {
        OrderID: 10262, CustomerID: 'RATTC', EmployeeID: 8, OrderDate: new Date(8379738e5),
        ShipName: 'Rattlesnake Canyon Grocery', ShipCity: 'Albuquerque', ShipAddress: '2817 Milton Dr.',
        ShipRegion: 'NM', ShipPostalCode: '87110', ShipCountry: 'USA', Freight: 48.29, Verified: !0
    }];

export let sdata: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'Brazil', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Brazil', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    }];

Group with Paging

On grouping columns with paging feature, the aggregated information and total items are displayed based on the current page. The grid does not consider aggregated information and total items from other pages. To get additional details (aggregated information and total items) from other pages, set the groupSettings.disablePageWiseAggregates to false.

If remote data is bound to grid dataSource, two requests will be sent when performing grouping action; one for getting the grouped data and another for getting aggregate details and total items count.

Group by format

By default, columns will be grouped by the data or value present for the particular row. To group numeric or datetime column based on the mentioned format, you have to enable the enableGroupByFormat property of the corresponding grid columns.

Source
Preview
App.tsx
datasource.tsx
import { ColumnDirective, ColumnsDirective, GridComponent, Group, GroupSettingsModel, Inject } from '@syncfusion/ej2-react-grids';
import * as React from 'react';
import { data } from './datasource';

export default class App extends React.Component<{}, {}>{
  public groupOptions : GroupSettingsModel = {
    columns: ['OrderDate', 'Freight'],
    showDropArea: false
  };

  public render(){
      return <GridComponent  dataSource={data} allowGrouping={true} groupSettings={this.groupOptions} height={315}>
                <ColumnsDirective>
                  <ColumnDirective field='OrderID' headerText='Order ID' width='120' textAlign="Right"/>
                  <ColumnDirective field='CustomerID' headerText='Customer ID' width='150'/>
                  <ColumnDirective field='OrderDate' headerText='Order Date' format='yMMM' enableGroupByFormat={true} width='150'/>
                  <ColumnDirective field='Freight' headerText='Freight' format='C2' enableGroupByFormat={true} width='150'/>
              </ColumnsDirective>
              <Inject services={[Group]}/>
          </GridComponent >
      }
};
export let employeeData: Object[] = [{
    'EmployeeID': 1,
    'LastName': 'Davolio',
    'FirstName': 'Nancy',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-664743600000),
    'HireDate': new Date(704692800000),
    'Address': '507 - 20th Ave. E.\r\nApt. 2A',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98122',
    'Country': 'USA',
    'HomePhone': '(206) 555-9857',
    'Extension': '5467',
    'Photo': { 'Length': 21626 },

    'Notes': 'Education includes a BA in psychology from Colorado State University in 1970.  She also completed\
    \'The Art of the Cold Call.\'  Nancy is a member of Toastmasters International.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 2,
    'LastName': 'Fuller',
    'FirstName': 'Andrew',
    'Title': 'Vice President, Sales',
    'TitleOfCourtesy': 'Dr.',
    'BirthDate': new Date(-563828400000),
    'HireDate': new Date(713764800000),
    'Address': '908 W. Capital Way',
    'City': 'Tacoma',
    'Region': 'WA',
    'PostalCode': '98401',
    'Country': 'USA',
    'HomePhone': '(206) 555-9482',
    'Extension': '3457',
    'Photo': { 'Length': 21626 },

    'Notes': 'Andrew received his BTS commercial in 1974 and a Ph.D. in international marketing from the University of \
    Dallas in 1981.  He is fluent in French and Italian and reads German.  He joined the company as a sales representative, \
    was promoted to sales manager in January 1992 and to vice president of sales in March 1993.  Andrew is a member of the \
    Sales Management Roundtable, the Seattle Chamber of Commerce, and the Pacific Rim Importers Association.',
    'ReportsTo': 0,
    'PhotoPath': 'http://accweb/emmployees/fuller.bmp'
},
{
    'EmployeeID': 3,
    'LastName': 'Leverling',
    'FirstName': 'Janet',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-200088000000),
    'HireDate': new Date(702104400000),
    'Address': '722 Moss Bay Blvd.',
    'City': 'Kirkland',
    'Region': 'WA',
    'PostalCode': '98033',
    'Country': 'USA',
    'HomePhone': '(206) 555-3412',
    'Extension': '3355',
    'Photo': { 'Length': 21722 },

    'Notes': 'Janet has a BS degree in chemistry from Boston College (1984). \
     She has also completed a certificate program in food retailing management.\
     Janet was hired as a sales associate in 1991 and promoted to sales representative in February 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/leverling.bmp'
},
{
    'EmployeeID': 4,
    'LastName': 'Peacock',
    'FirstName': 'Margaret',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mrs.',
    'BirthDate': new Date(-1018814400000),
    'HireDate': new Date(736401600000),
    'Address': '4110 Old Redmond Rd.',
    'City': 'Redmond',
    'Region': 'WA',
    'PostalCode': '98052',
    'Country': 'USA',
    'HomePhone': '(206) 555-8122',
    'Extension': '5176',
    'Photo': { 'Length': 21626 },

    'Notes': 'Margaret holds a BA in English literature from Concordia College (1958) and an MA from the American \
    Institute of Culinary Arts (1966).  She was assigned to the London office temporarily from July through November 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/peacock.bmp'
},
{
    'EmployeeID': 5,
    'LastName': 'Buchanan',
    'FirstName': 'Steven',
    'Title': 'Sales Manager',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-468010800000),
    'HireDate': new Date(750830400000),
    'Address': '14 Garrett Hill',
    'City': 'London',
    'Region': null,
    'PostalCode':
    'SW1 8JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-4848',
    'Extension': '3453',
    'Photo': { 'Length': 21626 },

    'Notes': 'Steven Buchanan graduated from St. Andrews University, Scotland, with a BSC degree in 1976.  Upon joining the company as \
    a sales representative in 1992, he spent 6 months in an orientation program at the Seattle office and then returned to his permanent \
    post in London.  He was promoted to sales manager in March 1993.  Mr. Buchanan has completed the courses \'Successful \
    Telemarketing\' and \'International Sales Management.\'  He is fluent in French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/buchanan.bmp'
},
{
    'EmployeeID': 6,
    'LastName': 'Suyama',
    'FirstName': 'Michael',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-205185600000),
    'HireDate': new Date(750830400000),
    'Address': 'Coventry House\r\nMiner Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'EC2 7JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-7773',
    'Extension': '428',
    'Photo': { 'Length': 21626 },

    'Notes': 'Michael is a graduate of Sussex University (MA, economics, 1983) and the University of California at Los Angeles \
    (MBA, marketing, 1986).  He has also taken the courses \'Multi-Cultural Selling\' and \'Time Management for the Sales Professional.\'  \
    He is fluent in Japanese and can read and write French, Portuguese, and Spanish.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 7,
    'LastName': 'King',
    'FirstName': 'Robert',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-302731200000),
    'HireDate': new Date(757486800000),
    'Address': 'Edgeham Hollow\r\nWinchester Way',
    'City': 'London',
    'Region': null,
    'PostalCode': 'RG1 9SP',
    'Country': 'UK',
    'HomePhone': '(71) 555-5598',
    'Extension': '465',
    'Photo': { 'Length': 21626 },

    'Notes': 'Robert King served in the Peace Corps and traveled extensively before completing his degree in English at the \
    University of Michigan in 1992, the year he joined the company.  After completing a course entitled \'Selling in Europe,\' \
    he was transferred to the London office in March 1993.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 8,
    'LastName': 'Callahan',
    'FirstName': 'Laura',
    'Title': 'Inside Sales Coordinator',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-377982000000),
    'HireDate': new Date(762843600000),
    'Address': '4726 - 11th Ave. N.E.',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98105',
    'Country': 'USA',
    'HomePhone': '(206) 555-1189',
    'Extension': '2344',
    'Photo': { 'Length': 21626 },

    'Notes': 'Laura received a BA in psychology from the University of Washington.  She has also completed a course in business \
    French.  She reads and writes French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 9,
    'LastName': 'Dodsworth',
    'FirstName': 'Anne',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-123966000000),
    'HireDate': new Date(784875600000),
    'Address': '7 Houndstooth Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'WG2 7LT',
    'Country': 'UK',
    'HomePhone': '(71) 555-4444',
    'Extension': '452',
    'Photo': { 'Length': 21626 },

    'Notes': 'Anne has a BA degree in English from St. Lawrence College.  She is fluent in French and German.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
}];


export let data: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'France', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Switzerland', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    },
    {
        OrderID: 10256, CustomerID: 'WELLI', EmployeeID: 3, OrderDate: new Date(837369e6),
        ShipName: 'Wellington Importadora', ShipCity: 'Resende', ShipAddress: 'Rua do Mercado, 12',
        ShipRegion: 'SP', ShipPostalCode: '08737-363', ShipCountry: 'Brazil', Freight: 13.97, Verified: !1
    },
    {
        OrderID: 10257, CustomerID: 'HILAA', EmployeeID: 4, OrderDate: new Date(8374554e5),
        ShipName: 'HILARION-Abastos', ShipCity: 'San Cristóbal', ShipAddress: 'Carrera 22 con Ave. Carlos Soublette #8-35',
        ShipRegion: 'Táchira', ShipPostalCode: '5022', ShipCountry: 'Venezuela', Freight: 81.91, Verified: !0
    },
    {
        OrderID: 10258, CustomerID: 'ERNSH', EmployeeID: 1, OrderDate: new Date(8375418e5),
        ShipName: 'Ernst Handel', ShipCity: 'Graz', ShipAddress: 'Kirchgasse 6',
        ShipRegion: 'CJ', ShipPostalCode: '8010', ShipCountry: 'Austria', Freight: 140.51, Verified: !0
    },
    {
        OrderID: 10259, CustomerID: 'CENTC', EmployeeID: 4, OrderDate: new Date(8376282e5),
        ShipName: 'Centro comercial Moctezuma', ShipCity: 'México D.F.', ShipAddress: 'Sierras de Granada 9993',
        ShipRegion: 'CJ', ShipPostalCode: '05022', ShipCountry: 'Mexico', Freight: 3.25, Verified: !1
    },
    {
        OrderID: 10260, CustomerID: 'OTTIK', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Ottilies Käseladen', ShipCity: 'Köln', ShipAddress: 'Mehrheimerstr. 369',
        ShipRegion: 'CJ', ShipPostalCode: '50739', ShipCountry: 'Germany', Freight: 55.09, Verified: !0
    },
    {
        OrderID: 10261, CustomerID: 'QUEDE', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Que Delícia', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua da Panificadora, 12',
        ShipRegion: 'RJ', ShipPostalCode: '02389-673', ShipCountry: 'Brazil', Freight: 3.05, Verified: !1
    },
    {
        OrderID: 10262, CustomerID: 'RATTC', EmployeeID: 8, OrderDate: new Date(8379738e5),
        ShipName: 'Rattlesnake Canyon Grocery', ShipCity: 'Albuquerque', ShipAddress: '2817 Milton Dr.',
        ShipRegion: 'NM', ShipPostalCode: '87110', ShipCountry: 'USA', Freight: 48.29, Verified: !0
    }];

export let sdata: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'Brazil', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Brazil', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    }];

Grouping events

During the group action, the grid component triggers two events. The actionBegin event triggers before the group action starts and the actionComplete event triggers after the group action is completed. Using these events you can perform any action.

Source
Preview
App.tsx
datasource.tsx
import { ActionEventArgs, ColumnDirective, ColumnsDirective } from '@syncfusion/ej2-react-grids';
import { GridComponent, Group, GroupSettingsModel, Inject } from '@syncfusion/ej2-react-grids'
import * as React from 'react';
import { data } from './datasource';

export default class App extends React.Component<{}, {}>{
  public groupOptions : GroupSettingsModel = { columns: ['CustomerID'] };
  public actionHandler (args: ActionEventArgs) {
      /** Custom Action */
      alert(args.requestType + ' ' + args.type);
  }

  public render(){
      return (<div>
              <GridComponent  dataSource={data} allowGrouping={true} groupSettings={this.groupOptions}
              actionBegin={this.actionHandler} actionComplete={this.actionHandler} height={280}>
                <ColumnsDirective>
                  <ColumnDirective field='OrderID' headerText='Order ID' width='120' textAlign="Right"/>
                  <ColumnDirective field='CustomerID' headerText='Customer ID' width='150'/>
                  <ColumnDirective field='ShipCity' headerText='Ship City' width='150'/>
                  <ColumnDirective field='ShipName' headerText='Ship Name' width='150'/>
              </ColumnsDirective>
              <Inject services={[Group]}/>
          </GridComponent ></div>)
      }
};
export let employeeData: Object[] = [{
    'EmployeeID': 1,
    'LastName': 'Davolio',
    'FirstName': 'Nancy',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-664743600000),
    'HireDate': new Date(704692800000),
    'Address': '507 - 20th Ave. E.\r\nApt. 2A',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98122',
    'Country': 'USA',
    'HomePhone': '(206) 555-9857',
    'Extension': '5467',
    'Photo': { 'Length': 21626 },

    'Notes': 'Education includes a BA in psychology from Colorado State University in 1970.  She also completed\
    \'The Art of the Cold Call.\'  Nancy is a member of Toastmasters International.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 2,
    'LastName': 'Fuller',
    'FirstName': 'Andrew',
    'Title': 'Vice President, Sales',
    'TitleOfCourtesy': 'Dr.',
    'BirthDate': new Date(-563828400000),
    'HireDate': new Date(713764800000),
    'Address': '908 W. Capital Way',
    'City': 'Tacoma',
    'Region': 'WA',
    'PostalCode': '98401',
    'Country': 'USA',
    'HomePhone': '(206) 555-9482',
    'Extension': '3457',
    'Photo': { 'Length': 21626 },

    'Notes': 'Andrew received his BTS commercial in 1974 and a Ph.D. in international marketing from the University of \
    Dallas in 1981.  He is fluent in French and Italian and reads German.  He joined the company as a sales representative, \
    was promoted to sales manager in January 1992 and to vice president of sales in March 1993.  Andrew is a member of the \
    Sales Management Roundtable, the Seattle Chamber of Commerce, and the Pacific Rim Importers Association.',
    'ReportsTo': 0,
    'PhotoPath': 'http://accweb/emmployees/fuller.bmp'
},
{
    'EmployeeID': 3,
    'LastName': 'Leverling',
    'FirstName': 'Janet',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-200088000000),
    'HireDate': new Date(702104400000),
    'Address': '722 Moss Bay Blvd.',
    'City': 'Kirkland',
    'Region': 'WA',
    'PostalCode': '98033',
    'Country': 'USA',
    'HomePhone': '(206) 555-3412',
    'Extension': '3355',
    'Photo': { 'Length': 21722 },

    'Notes': 'Janet has a BS degree in chemistry from Boston College (1984). \
     She has also completed a certificate program in food retailing management.\
     Janet was hired as a sales associate in 1991 and promoted to sales representative in February 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/leverling.bmp'
},
{
    'EmployeeID': 4,
    'LastName': 'Peacock',
    'FirstName': 'Margaret',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mrs.',
    'BirthDate': new Date(-1018814400000),
    'HireDate': new Date(736401600000),
    'Address': '4110 Old Redmond Rd.',
    'City': 'Redmond',
    'Region': 'WA',
    'PostalCode': '98052',
    'Country': 'USA',
    'HomePhone': '(206) 555-8122',
    'Extension': '5176',
    'Photo': { 'Length': 21626 },

    'Notes': 'Margaret holds a BA in English literature from Concordia College (1958) and an MA from the American \
    Institute of Culinary Arts (1966).  She was assigned to the London office temporarily from July through November 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/peacock.bmp'
},
{
    'EmployeeID': 5,
    'LastName': 'Buchanan',
    'FirstName': 'Steven',
    'Title': 'Sales Manager',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-468010800000),
    'HireDate': new Date(750830400000),
    'Address': '14 Garrett Hill',
    'City': 'London',
    'Region': null,
    'PostalCode':
    'SW1 8JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-4848',
    'Extension': '3453',
    'Photo': { 'Length': 21626 },

    'Notes': 'Steven Buchanan graduated from St. Andrews University, Scotland, with a BSC degree in 1976.  Upon joining the company as \
    a sales representative in 1992, he spent 6 months in an orientation program at the Seattle office and then returned to his permanent \
    post in London.  He was promoted to sales manager in March 1993.  Mr. Buchanan has completed the courses \'Successful \
    Telemarketing\' and \'International Sales Management.\'  He is fluent in French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/buchanan.bmp'
},
{
    'EmployeeID': 6,
    'LastName': 'Suyama',
    'FirstName': 'Michael',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-205185600000),
    'HireDate': new Date(750830400000),
    'Address': 'Coventry House\r\nMiner Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'EC2 7JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-7773',
    'Extension': '428',
    'Photo': { 'Length': 21626 },

    'Notes': 'Michael is a graduate of Sussex University (MA, economics, 1983) and the University of California at Los Angeles \
    (MBA, marketing, 1986).  He has also taken the courses \'Multi-Cultural Selling\' and \'Time Management for the Sales Professional.\'  \
    He is fluent in Japanese and can read and write French, Portuguese, and Spanish.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 7,
    'LastName': 'King',
    'FirstName': 'Robert',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-302731200000),
    'HireDate': new Date(757486800000),
    'Address': 'Edgeham Hollow\r\nWinchester Way',
    'City': 'London',
    'Region': null,
    'PostalCode': 'RG1 9SP',
    'Country': 'UK',
    'HomePhone': '(71) 555-5598',
    'Extension': '465',
    'Photo': { 'Length': 21626 },

    'Notes': 'Robert King served in the Peace Corps and traveled extensively before completing his degree in English at the \
    University of Michigan in 1992, the year he joined the company.  After completing a course entitled \'Selling in Europe,\' \
    he was transferred to the London office in March 1993.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 8,
    'LastName': 'Callahan',
    'FirstName': 'Laura',
    'Title': 'Inside Sales Coordinator',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-377982000000),
    'HireDate': new Date(762843600000),
    'Address': '4726 - 11th Ave. N.E.',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98105',
    'Country': 'USA',
    'HomePhone': '(206) 555-1189',
    'Extension': '2344',
    'Photo': { 'Length': 21626 },

    'Notes': 'Laura received a BA in psychology from the University of Washington.  She has also completed a course in business \
    French.  She reads and writes French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 9,
    'LastName': 'Dodsworth',
    'FirstName': 'Anne',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-123966000000),
    'HireDate': new Date(784875600000),
    'Address': '7 Houndstooth Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'WG2 7LT',
    'Country': 'UK',
    'HomePhone': '(71) 555-4444',
    'Extension': '452',
    'Photo': { 'Length': 21626 },

    'Notes': 'Anne has a BA degree in English from St. Lawrence College.  She is fluent in French and German.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
}];


export let data: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'France', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Switzerland', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    },
    {
        OrderID: 10256, CustomerID: 'WELLI', EmployeeID: 3, OrderDate: new Date(837369e6),
        ShipName: 'Wellington Importadora', ShipCity: 'Resende', ShipAddress: 'Rua do Mercado, 12',
        ShipRegion: 'SP', ShipPostalCode: '08737-363', ShipCountry: 'Brazil', Freight: 13.97, Verified: !1
    },
    {
        OrderID: 10257, CustomerID: 'HILAA', EmployeeID: 4, OrderDate: new Date(8374554e5),
        ShipName: 'HILARION-Abastos', ShipCity: 'San Cristóbal', ShipAddress: 'Carrera 22 con Ave. Carlos Soublette #8-35',
        ShipRegion: 'Táchira', ShipPostalCode: '5022', ShipCountry: 'Venezuela', Freight: 81.91, Verified: !0
    },
    {
        OrderID: 10258, CustomerID: 'ERNSH', EmployeeID: 1, OrderDate: new Date(8375418e5),
        ShipName: 'Ernst Handel', ShipCity: 'Graz', ShipAddress: 'Kirchgasse 6',
        ShipRegion: 'CJ', ShipPostalCode: '8010', ShipCountry: 'Austria', Freight: 140.51, Verified: !0
    },
    {
        OrderID: 10259, CustomerID: 'CENTC', EmployeeID: 4, OrderDate: new Date(8376282e5),
        ShipName: 'Centro comercial Moctezuma', ShipCity: 'México D.F.', ShipAddress: 'Sierras de Granada 9993',
        ShipRegion: 'CJ', ShipPostalCode: '05022', ShipCountry: 'Mexico', Freight: 3.25, Verified: !1
    },
    {
        OrderID: 10260, CustomerID: 'OTTIK', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Ottilies Käseladen', ShipCity: 'Köln', ShipAddress: 'Mehrheimerstr. 369',
        ShipRegion: 'CJ', ShipPostalCode: '50739', ShipCountry: 'Germany', Freight: 55.09, Verified: !0
    },
    {
        OrderID: 10261, CustomerID: 'QUEDE', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Que Delícia', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua da Panificadora, 12',
        ShipRegion: 'RJ', ShipPostalCode: '02389-673', ShipCountry: 'Brazil', Freight: 3.05, Verified: !1
    },
    {
        OrderID: 10262, CustomerID: 'RATTC', EmployeeID: 8, OrderDate: new Date(8379738e5),
        ShipName: 'Rattlesnake Canyon Grocery', ShipCity: 'Albuquerque', ShipAddress: '2817 Milton Dr.',
        ShipRegion: 'NM', ShipPostalCode: '87110', ShipCountry: 'USA', Freight: 48.29, Verified: !0
    }];

export let sdata: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'Brazil', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Brazil', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    }];

args.requestType retrieves current action name. For example in grouping, the args.requestType value is grouping.

Collapse By External Button

You can collapse the selected group from an external button by invoking expandCollapseRows method.

Source
Preview
App.tsx
datasource.tsx
import { ButtonComponent } from '@syncfusion/ej2-react-buttons';
import { ColumnDirective, ColumnsDirective } from '@syncfusion/ej2-react-grids';
import { Grid, GridComponent, Group, GroupSettingsModel, Inject } from '@syncfusion/ej2-react-grids'
import * as React from 'react';
import { data } from './datasource';

export default class App extends React.Component<{}, {}>{
  public grid: Grid | null;
  public groupOptions : GroupSettingsModel = {
    columns: ['CustomerID']
  };
  public collapse() {
      if (this.grid) {
        if (this.grid.getSelectedRowIndexes().length) {
          let currentTr: HTMLElement = this.grid.getRows()[this.grid.getSelectedRowIndexes()[0]] as HTMLElement;
          while (currentTr.classList && currentTr.classList.length){
              currentTr = currentTr.previousSibling as HTMLElement;
          }
          const collapseElement = currentTr.querySelector('.e-recordplusexpand');
          /** Pass the collapse row element */
          this.grid.groupModule.expandCollapseRows(collapseElement as Element);
        }
      }
  }

  public render(){
      this.collapse = this.collapse.bind(this);
      return (<div>
              <ButtonComponent className= {'e-flat'} onClick= { this.collapse }>Collapse</ButtonComponent>
              <GridComponent  dataSource={data} allowGrouping={true} groupSettings={this.groupOptions}
                height={240} ref={g=> this.grid = g}>
                <ColumnsDirective>
                  <ColumnDirective field='OrderID' headerText='Order ID' width='120' textAlign="Right"/>
                  <ColumnDirective field='CustomerID' headerText='Customer ID' width='150'/>
                  <ColumnDirective field='ShipCity' headerText='Ship City' width='150'/>
                  <ColumnDirective field='ShipName' headerText='Ship Name' width='150'/>
              </ColumnsDirective>
              <Inject services={[Group]}/>
          </GridComponent ></div>)
      }
};
export let employeeData: Object[] = [{
    'EmployeeID': 1,
    'LastName': 'Davolio',
    'FirstName': 'Nancy',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-664743600000),
    'HireDate': new Date(704692800000),
    'Address': '507 - 20th Ave. E.\r\nApt. 2A',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98122',
    'Country': 'USA',
    'HomePhone': '(206) 555-9857',
    'Extension': '5467',
    'Photo': { 'Length': 21626 },

    'Notes': 'Education includes a BA in psychology from Colorado State University in 1970.  She also completed\
    \'The Art of the Cold Call.\'  Nancy is a member of Toastmasters International.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 2,
    'LastName': 'Fuller',
    'FirstName': 'Andrew',
    'Title': 'Vice President, Sales',
    'TitleOfCourtesy': 'Dr.',
    'BirthDate': new Date(-563828400000),
    'HireDate': new Date(713764800000),
    'Address': '908 W. Capital Way',
    'City': 'Tacoma',
    'Region': 'WA',
    'PostalCode': '98401',
    'Country': 'USA',
    'HomePhone': '(206) 555-9482',
    'Extension': '3457',
    'Photo': { 'Length': 21626 },

    'Notes': 'Andrew received his BTS commercial in 1974 and a Ph.D. in international marketing from the University of \
    Dallas in 1981.  He is fluent in French and Italian and reads German.  He joined the company as a sales representative, \
    was promoted to sales manager in January 1992 and to vice president of sales in March 1993.  Andrew is a member of the \
    Sales Management Roundtable, the Seattle Chamber of Commerce, and the Pacific Rim Importers Association.',
    'ReportsTo': 0,
    'PhotoPath': 'http://accweb/emmployees/fuller.bmp'
},
{
    'EmployeeID': 3,
    'LastName': 'Leverling',
    'FirstName': 'Janet',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-200088000000),
    'HireDate': new Date(702104400000),
    'Address': '722 Moss Bay Blvd.',
    'City': 'Kirkland',
    'Region': 'WA',
    'PostalCode': '98033',
    'Country': 'USA',
    'HomePhone': '(206) 555-3412',
    'Extension': '3355',
    'Photo': { 'Length': 21722 },

    'Notes': 'Janet has a BS degree in chemistry from Boston College (1984). \
     She has also completed a certificate program in food retailing management.\
     Janet was hired as a sales associate in 1991 and promoted to sales representative in February 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/leverling.bmp'
},
{
    'EmployeeID': 4,
    'LastName': 'Peacock',
    'FirstName': 'Margaret',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mrs.',
    'BirthDate': new Date(-1018814400000),
    'HireDate': new Date(736401600000),
    'Address': '4110 Old Redmond Rd.',
    'City': 'Redmond',
    'Region': 'WA',
    'PostalCode': '98052',
    'Country': 'USA',
    'HomePhone': '(206) 555-8122',
    'Extension': '5176',
    'Photo': { 'Length': 21626 },

    'Notes': 'Margaret holds a BA in English literature from Concordia College (1958) and an MA from the American \
    Institute of Culinary Arts (1966).  She was assigned to the London office temporarily from July through November 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/peacock.bmp'
},
{
    'EmployeeID': 5,
    'LastName': 'Buchanan',
    'FirstName': 'Steven',
    'Title': 'Sales Manager',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-468010800000),
    'HireDate': new Date(750830400000),
    'Address': '14 Garrett Hill',
    'City': 'London',
    'Region': null,
    'PostalCode':
    'SW1 8JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-4848',
    'Extension': '3453',
    'Photo': { 'Length': 21626 },

    'Notes': 'Steven Buchanan graduated from St. Andrews University, Scotland, with a BSC degree in 1976.  Upon joining the company as \
    a sales representative in 1992, he spent 6 months in an orientation program at the Seattle office and then returned to his permanent \
    post in London.  He was promoted to sales manager in March 1993.  Mr. Buchanan has completed the courses \'Successful \
    Telemarketing\' and \'International Sales Management.\'  He is fluent in French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/buchanan.bmp'
},
{
    'EmployeeID': 6,
    'LastName': 'Suyama',
    'FirstName': 'Michael',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-205185600000),
    'HireDate': new Date(750830400000),
    'Address': 'Coventry House\r\nMiner Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'EC2 7JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-7773',
    'Extension': '428',
    'Photo': { 'Length': 21626 },

    'Notes': 'Michael is a graduate of Sussex University (MA, economics, 1983) and the University of California at Los Angeles \
    (MBA, marketing, 1986).  He has also taken the courses \'Multi-Cultural Selling\' and \'Time Management for the Sales Professional.\'  \
    He is fluent in Japanese and can read and write French, Portuguese, and Spanish.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 7,
    'LastName': 'King',
    'FirstName': 'Robert',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-302731200000),
    'HireDate': new Date(757486800000),
    'Address': 'Edgeham Hollow\r\nWinchester Way',
    'City': 'London',
    'Region': null,
    'PostalCode': 'RG1 9SP',
    'Country': 'UK',
    'HomePhone': '(71) 555-5598',
    'Extension': '465',
    'Photo': { 'Length': 21626 },

    'Notes': 'Robert King served in the Peace Corps and traveled extensively before completing his degree in English at the \
    University of Michigan in 1992, the year he joined the company.  After completing a course entitled \'Selling in Europe,\' \
    he was transferred to the London office in March 1993.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 8,
    'LastName': 'Callahan',
    'FirstName': 'Laura',
    'Title': 'Inside Sales Coordinator',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-377982000000),
    'HireDate': new Date(762843600000),
    'Address': '4726 - 11th Ave. N.E.',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98105',
    'Country': 'USA',
    'HomePhone': '(206) 555-1189',
    'Extension': '2344',
    'Photo': { 'Length': 21626 },

    'Notes': 'Laura received a BA in psychology from the University of Washington.  She has also completed a course in business \
    French.  She reads and writes French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 9,
    'LastName': 'Dodsworth',
    'FirstName': 'Anne',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-123966000000),
    'HireDate': new Date(784875600000),
    'Address': '7 Houndstooth Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'WG2 7LT',
    'Country': 'UK',
    'HomePhone': '(71) 555-4444',
    'Extension': '452',
    'Photo': { 'Length': 21626 },

    'Notes': 'Anne has a BA degree in English from St. Lawrence College.  She is fluent in French and German.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
}];


export let data: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'France', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Switzerland', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    },
    {
        OrderID: 10256, CustomerID: 'WELLI', EmployeeID: 3, OrderDate: new Date(837369e6),
        ShipName: 'Wellington Importadora', ShipCity: 'Resende', ShipAddress: 'Rua do Mercado, 12',
        ShipRegion: 'SP', ShipPostalCode: '08737-363', ShipCountry: 'Brazil', Freight: 13.97, Verified: !1
    },
    {
        OrderID: 10257, CustomerID: 'HILAA', EmployeeID: 4, OrderDate: new Date(8374554e5),
        ShipName: 'HILARION-Abastos', ShipCity: 'San Cristóbal', ShipAddress: 'Carrera 22 con Ave. Carlos Soublette #8-35',
        ShipRegion: 'Táchira', ShipPostalCode: '5022', ShipCountry: 'Venezuela', Freight: 81.91, Verified: !0
    },
    {
        OrderID: 10258, CustomerID: 'ERNSH', EmployeeID: 1, OrderDate: new Date(8375418e5),
        ShipName: 'Ernst Handel', ShipCity: 'Graz', ShipAddress: 'Kirchgasse 6',
        ShipRegion: 'CJ', ShipPostalCode: '8010', ShipCountry: 'Austria', Freight: 140.51, Verified: !0
    },
    {
        OrderID: 10259, CustomerID: 'CENTC', EmployeeID: 4, OrderDate: new Date(8376282e5),
        ShipName: 'Centro comercial Moctezuma', ShipCity: 'México D.F.', ShipAddress: 'Sierras de Granada 9993',
        ShipRegion: 'CJ', ShipPostalCode: '05022', ShipCountry: 'Mexico', Freight: 3.25, Verified: !1
    },
    {
        OrderID: 10260, CustomerID: 'OTTIK', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Ottilies Käseladen', ShipCity: 'Köln', ShipAddress: 'Mehrheimerstr. 369',
        ShipRegion: 'CJ', ShipPostalCode: '50739', ShipCountry: 'Germany', Freight: 55.09, Verified: !0
    },
    {
        OrderID: 10261, CustomerID: 'QUEDE', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Que Delícia', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua da Panificadora, 12',
        ShipRegion: 'RJ', ShipPostalCode: '02389-673', ShipCountry: 'Brazil', Freight: 3.05, Verified: !1
    },
    {
        OrderID: 10262, CustomerID: 'RATTC', EmployeeID: 8, OrderDate: new Date(8379738e5),
        ShipName: 'Rattlesnake Canyon Grocery', ShipCity: 'Albuquerque', ShipAddress: '2817 Milton Dr.',
        ShipRegion: 'NM', ShipPostalCode: '87110', ShipCountry: 'USA', Freight: 48.29, Verified: !0
    }];

export let sdata: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'Brazil', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Brazil', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    }];

Reordering on Grouped Columns

Grid provides an option to interchange the position of the Grouped Columns by dragging and dropping the grouped headercells in the droparea. So, any new column entering into the droparea can also be dropped in any position.

To enable this feature, you have to set the groupSettings.allowReordering property as true.

Source
Preview
App.tsx
datasource.tsx
import { ColumnDirective, ColumnsDirective } from '@syncfusion/ej2-react-grids';
import { Grid, GridComponent, Group, GroupSettingsModel, Inject } from '@syncfusion/ej2-react-grids'
import * as React from 'react';
import { data } from './datasource';

export default class App extends React.Component<{}, {}>{
  public grid: Grid | null;
  public groupOptions : GroupSettingsModel = {
    columns: ['CustomerID'],
    allowReordering: true
  };

  public render(){
      return (<div>
              <GridComponent  dataSource={data} allowGrouping={true} groupSettings={this.groupOptions}
                height={240} ref={g=> this.grid = g}>
                <ColumnsDirective>
                  <ColumnDirective field='OrderID' headerText='Order ID' width='120' textAlign="Right"/>
                  <ColumnDirective field='CustomerID' headerText='Customer ID' width='150'/>
                  <ColumnDirective field='ShipCity' headerText='Ship City' width='150'/>
                  <ColumnDirective field='ShipName' headerText='Ship Name' width='150'/>
              </ColumnsDirective>
              <Inject services={[Group]}/>
          </GridComponent ></div>)
      }
};
export let employeeData: Object[] = [{
    'EmployeeID': 1,
    'LastName': 'Davolio',
    'FirstName': 'Nancy',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-664743600000),
    'HireDate': new Date(704692800000),
    'Address': '507 - 20th Ave. E.\r\nApt. 2A',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98122',
    'Country': 'USA',
    'HomePhone': '(206) 555-9857',
    'Extension': '5467',
    'Photo': { 'Length': 21626 },

    'Notes': 'Education includes a BA in psychology from Colorado State University in 1970.  She also completed\
    \'The Art of the Cold Call.\'  Nancy is a member of Toastmasters International.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 2,
    'LastName': 'Fuller',
    'FirstName': 'Andrew',
    'Title': 'Vice President, Sales',
    'TitleOfCourtesy': 'Dr.',
    'BirthDate': new Date(-563828400000),
    'HireDate': new Date(713764800000),
    'Address': '908 W. Capital Way',
    'City': 'Tacoma',
    'Region': 'WA',
    'PostalCode': '98401',
    'Country': 'USA',
    'HomePhone': '(206) 555-9482',
    'Extension': '3457',
    'Photo': { 'Length': 21626 },

    'Notes': 'Andrew received his BTS commercial in 1974 and a Ph.D. in international marketing from the University of \
    Dallas in 1981.  He is fluent in French and Italian and reads German.  He joined the company as a sales representative, \
    was promoted to sales manager in January 1992 and to vice president of sales in March 1993.  Andrew is a member of the \
    Sales Management Roundtable, the Seattle Chamber of Commerce, and the Pacific Rim Importers Association.',
    'ReportsTo': 0,
    'PhotoPath': 'http://accweb/emmployees/fuller.bmp'
},
{
    'EmployeeID': 3,
    'LastName': 'Leverling',
    'FirstName': 'Janet',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-200088000000),
    'HireDate': new Date(702104400000),
    'Address': '722 Moss Bay Blvd.',
    'City': 'Kirkland',
    'Region': 'WA',
    'PostalCode': '98033',
    'Country': 'USA',
    'HomePhone': '(206) 555-3412',
    'Extension': '3355',
    'Photo': { 'Length': 21722 },

    'Notes': 'Janet has a BS degree in chemistry from Boston College (1984). \
     She has also completed a certificate program in food retailing management.\
     Janet was hired as a sales associate in 1991 and promoted to sales representative in February 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/leverling.bmp'
},
{
    'EmployeeID': 4,
    'LastName': 'Peacock',
    'FirstName': 'Margaret',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mrs.',
    'BirthDate': new Date(-1018814400000),
    'HireDate': new Date(736401600000),
    'Address': '4110 Old Redmond Rd.',
    'City': 'Redmond',
    'Region': 'WA',
    'PostalCode': '98052',
    'Country': 'USA',
    'HomePhone': '(206) 555-8122',
    'Extension': '5176',
    'Photo': { 'Length': 21626 },

    'Notes': 'Margaret holds a BA in English literature from Concordia College (1958) and an MA from the American \
    Institute of Culinary Arts (1966).  She was assigned to the London office temporarily from July through November 1992.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/peacock.bmp'
},
{
    'EmployeeID': 5,
    'LastName': 'Buchanan',
    'FirstName': 'Steven',
    'Title': 'Sales Manager',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-468010800000),
    'HireDate': new Date(750830400000),
    'Address': '14 Garrett Hill',
    'City': 'London',
    'Region': null,
    'PostalCode':
    'SW1 8JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-4848',
    'Extension': '3453',
    'Photo': { 'Length': 21626 },

    'Notes': 'Steven Buchanan graduated from St. Andrews University, Scotland, with a BSC degree in 1976.  Upon joining the company as \
    a sales representative in 1992, he spent 6 months in an orientation program at the Seattle office and then returned to his permanent \
    post in London.  He was promoted to sales manager in March 1993.  Mr. Buchanan has completed the courses \'Successful \
    Telemarketing\' and \'International Sales Management.\'  He is fluent in French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/buchanan.bmp'
},
{
    'EmployeeID': 6,
    'LastName': 'Suyama',
    'FirstName': 'Michael',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-205185600000),
    'HireDate': new Date(750830400000),
    'Address': 'Coventry House\r\nMiner Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'EC2 7JR',
    'Country': 'UK',
    'HomePhone': '(71) 555-7773',
    'Extension': '428',
    'Photo': { 'Length': 21626 },

    'Notes': 'Michael is a graduate of Sussex University (MA, economics, 1983) and the University of California at Los Angeles \
    (MBA, marketing, 1986).  He has also taken the courses \'Multi-Cultural Selling\' and \'Time Management for the Sales Professional.\'  \
    He is fluent in Japanese and can read and write French, Portuguese, and Spanish.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 7,
    'LastName': 'King',
    'FirstName': 'Robert',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Mr.',
    'BirthDate': new Date(-302731200000),
    'HireDate': new Date(757486800000),
    'Address': 'Edgeham Hollow\r\nWinchester Way',
    'City': 'London',
    'Region': null,
    'PostalCode': 'RG1 9SP',
    'Country': 'UK',
    'HomePhone': '(71) 555-5598',
    'Extension': '465',
    'Photo': { 'Length': 21626 },

    'Notes': 'Robert King served in the Peace Corps and traveled extensively before completing his degree in English at the \
    University of Michigan in 1992, the year he joined the company.  After completing a course entitled \'Selling in Europe,\' \
    he was transferred to the London office in March 1993.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 8,
    'LastName': 'Callahan',
    'FirstName': 'Laura',
    'Title': 'Inside Sales Coordinator',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-377982000000),
    'HireDate': new Date(762843600000),
    'Address': '4726 - 11th Ave. N.E.',
    'City': 'Seattle',
    'Region': 'WA',
    'PostalCode': '98105',
    'Country': 'USA',
    'HomePhone': '(206) 555-1189',
    'Extension': '2344',
    'Photo': { 'Length': 21626 },

    'Notes': 'Laura received a BA in psychology from the University of Washington.  She has also completed a course in business \
    French.  She reads and writes French.',
    'ReportsTo': 2,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
},
{
    'EmployeeID': 9,
    'LastName': 'Dodsworth',
    'FirstName': 'Anne',
    'Title': 'Sales Representative',
    'TitleOfCourtesy': 'Ms.',
    'BirthDate': new Date(-123966000000),
    'HireDate': new Date(784875600000),
    'Address': '7 Houndstooth Rd.',
    'City': 'London',
    'Region': null,
    'PostalCode': 'WG2 7LT',
    'Country': 'UK',
    'HomePhone': '(71) 555-4444',
    'Extension': '452',
    'Photo': { 'Length': 21626 },

    'Notes': 'Anne has a BA degree in English from St. Lawrence College.  She is fluent in French and German.',
    'ReportsTo': 5,
    'PhotoPath': 'http://accweb/emmployees/davolio.bmp'
}];


export let data: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'France', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Switzerland', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    },
    {
        OrderID: 10256, CustomerID: 'WELLI', EmployeeID: 3, OrderDate: new Date(837369e6),
        ShipName: 'Wellington Importadora', ShipCity: 'Resende', ShipAddress: 'Rua do Mercado, 12',
        ShipRegion: 'SP', ShipPostalCode: '08737-363', ShipCountry: 'Brazil', Freight: 13.97, Verified: !1
    },
    {
        OrderID: 10257, CustomerID: 'HILAA', EmployeeID: 4, OrderDate: new Date(8374554e5),
        ShipName: 'HILARION-Abastos', ShipCity: 'San Cristóbal', ShipAddress: 'Carrera 22 con Ave. Carlos Soublette #8-35',
        ShipRegion: 'Táchira', ShipPostalCode: '5022', ShipCountry: 'Venezuela', Freight: 81.91, Verified: !0
    },
    {
        OrderID: 10258, CustomerID: 'ERNSH', EmployeeID: 1, OrderDate: new Date(8375418e5),
        ShipName: 'Ernst Handel', ShipCity: 'Graz', ShipAddress: 'Kirchgasse 6',
        ShipRegion: 'CJ', ShipPostalCode: '8010', ShipCountry: 'Austria', Freight: 140.51, Verified: !0
    },
    {
        OrderID: 10259, CustomerID: 'CENTC', EmployeeID: 4, OrderDate: new Date(8376282e5),
        ShipName: 'Centro comercial Moctezuma', ShipCity: 'México D.F.', ShipAddress: 'Sierras de Granada 9993',
        ShipRegion: 'CJ', ShipPostalCode: '05022', ShipCountry: 'Mexico', Freight: 3.25, Verified: !1
    },
    {
        OrderID: 10260, CustomerID: 'OTTIK', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Ottilies Käseladen', ShipCity: 'Köln', ShipAddress: 'Mehrheimerstr. 369',
        ShipRegion: 'CJ', ShipPostalCode: '50739', ShipCountry: 'Germany', Freight: 55.09, Verified: !0
    },
    {
        OrderID: 10261, CustomerID: 'QUEDE', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Que Delícia', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua da Panificadora, 12',
        ShipRegion: 'RJ', ShipPostalCode: '02389-673', ShipCountry: 'Brazil', Freight: 3.05, Verified: !1
    },
    {
        OrderID: 10262, CustomerID: 'RATTC', EmployeeID: 8, OrderDate: new Date(8379738e5),
        ShipName: 'Rattlesnake Canyon Grocery', ShipCity: 'Albuquerque', ShipAddress: '2817 Milton Dr.',
        ShipRegion: 'NM', ShipPostalCode: '87110', ShipCountry: 'USA', Freight: 48.29, Verified: !0
    }];

export let sdata: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'Brazil', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Brazil', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    }];

Lazy Load Grouping

The lazy load grouping allows you to load grouped records to the Grid through the on-demand concept. So, you can use this feature to load a huge amount of grouped data to the Grid without any performance degradation.

When you enable this feature, the Grid will render only the initial level caption rows in the collapsed state at grouping. The child rows of each caption will be fetched from the server and render in the Grid when you expand the caption row. The fetching child records count will be implicitly determined by the content area occupying rows count. So, if the child records exceed the count, then the Grid will request the server again to fetch the next block of child records on scrolling.

The caption row expand/collapse state will be persisted on paging and Grid pages count will be determined based on the caption rows count instead of the child rows.

To enable this feature, you have to set the groupSettings.enableLazyLoading property as true.

Source
Preview
App.tsx
datasource.tsx
import { ColumnDirective, ColumnsDirective } from '@syncfusion/ej2-react-grids';
import { Grid, GridComponent, Group, Page, LazyLoadGroup, GroupSettingsModel, Inject } from '@syncfusion/ej2-react-grids'
import * as React from 'react';
import { data } from './datasource';

export default class App extends React.Component<{}, {}>{
  public grid: Grid | null;
  public groupOptions : GroupSettingsModel = {
    enableLazyLoading: true,
    columns: ['ProductName', 'CustomerName']
  }

  public render(){
      return (<div>
              <GridComponent dataSource={data} allowPaging={true} allowGrouping={true} groupSettings={this.groupOptions}
                height={240} ref={g=> this.grid = g}>
                <ColumnsDirective>
                  <ColumnDirective field='OrderID' headerText='Order ID' textAlign="Right" width='120'/>
                  <ColumnDirective field='ProductName' headerText='Product Name' width='160'/>
                  <ColumnDirective field='ProductID' headerText='Product ID' textAlign="Right" width='120'/>
                  <ColumnDirective field='CustomerID' headerText='Customer ID' width='120'/>
                  <ColumnDirective field='CustomerName' headerText='Customer Name' width='160'/>
              </ColumnsDirective>
              <Inject services={[Page, Group, LazyLoadGroup]}/>
          </GridComponent></div>)
      }
};
export let data: Object[] = createLazyLoadData();

function createLazyLoadData() {
    var lazyLoadData = [];
    var customerid = ['VINET', 'TOMSP', 'HANAR', 'VICTE', 'SUPRD', 'HANAR', 'CHOPS', 'RICSU', 'WELLI', 'HILAA', 'ERNSH', 'CENTC',
        'OTTIK', 'QUEDE', 'RATTC', 'ERNSH', 'FOLKO', 'BLONP', 'WARTH', 'FRANK', 'GROSR', 'WHITC', 'WARTH', 'SPLIR', 'RATTC', 'QUICK', 'VINET',
        'MAGAA', 'TORTU', 'MORGK', 'BERGS', 'LEHMS', 'BERGS', 'ROMEY', 'ROMEY', 'LILAS', 'LEHMS', 'QUICK', 'QUICK', 'RICAR', 'REGGC', 'BSBEV',
        'COMMI', 'QUEDE', 'TRADH', 'TORTU', 'RATTC', 'VINET', 'LILAS', 'BLONP', 'HUNGO', 'RICAR', 'MAGAA', 'WANDK', 'SUPRD', 'GODOS', 'TORTU',
        'OLDWO', 'ROMEY', 'LONEP', 'ANATR', 'HUNGO', 'THEBI', 'DUMON', 'WANDK', 'QUICK', 'RATTC', 'ISLAT', 'RATTC', 'LONEP', 'ISLAT', 'TORTU',
        'WARTH', 'ISLAT', 'PERIC', 'KOENE', 'SAVEA', 'KOENE', 'BOLID', 'FOLKO', 'FURIB', 'SPLIR', 'LILAS', 'BONAP', 'MEREP', 'WARTH', 'VICTE',
        'HUNGO', 'PRINI', 'FRANK', 'OLDWO', 'MEREP', 'BONAP', 'SIMOB', 'FRANK', 'LEHMS', 'WHITC', 'QUICK', 'RATTC', 'FAMIA'];
    var product = ['Chai', 'Chang', 'Aniseed Syrup', 'Chef Anton\'s Cajun Seasoning', 'Chef Anton\'s Gumbo Mix', 'Grandma\'s Boysenberry Spread',
        'Uncle Bob\'s Organic Dried Pears', 'Northwoods Cranberry Sauce', 'Mishi Kobe Niku', 'Ikura', 'Queso Cabrales', 'Queso Manchego La Pastora', 'Konbu',
        'Tofu', 'Genen Shouyu', 'Pavlova', 'Alice Mutton', 'Carnarvon Tigers', 'Teatime Chocolate Biscuits', 'Sir Rodney\'s Marmalade', 'Sir Rodney\'s Scones',
        'Gustaf\'s Knäckebröd', 'Tunnbröd', 'Guaraná Fantástica', 'NuNuCa Nuß-Nougat-Creme', 'Gumbär Gummibärchen', 'Schoggi Schokolade', 'Rössle Sauerkraut',
        'Thüringer Rostbratwurst', 'Nord-Ost Matjeshering', 'Gorgonzola Telino', 'Mascarpone Fabioli', 'Geitost', 'Sasquatch Ale', 'Steeleye Stout', 'Inlagd Sill',
        'Gravad lax', 'Côte de Blaye', 'Chartreuse verte', 'Boston Crab Meat', 'Jack\'s New England Clam Chowder', 'Singaporean Hokkien Fried Mee', 'Ipoh Coffee',
        'Gula Malacca', 'Rogede sild', 'Spegesild', 'Zaanse koeken', 'Chocolade', 'Maxilaku', 'Valkoinen suklaa', 'Manjimup Dried Apples', 'Filo Mix', 'Perth Pasties',
        'Tourtière', 'Pâté chinois', 'Gnocchi di nonna Alice', 'Ravioli Angelo', 'Escargots de Bourgogne', 'Raclette Courdavault', 'Camembert Pierrot', 'Sirop d\'érable',
        'Tarte au sucre', 'Vegie-spread', 'Wimmers gute Semmelknödel', 'Louisiana Fiery Hot Pepper Sauce', 'Louisiana Hot Spiced Okra', 'Laughing Lumberjack Lager', 'Scottish Longbreads',
        'Gudbrandsdalsost', 'Outback Lager', 'Flotemysost', 'Mozzarella di Giovanni', 'Röd Kaviar', 'Longlife Tofu', 'Rhönbräu Klosterbier', 'Lakkalikööri', 'Original Frankfurter grüne Soße'];
    var customername = ['Maria', 'Ana Trujillo', 'Antonio Moreno', 'Thomas Hardy', 'Christina Berglund', 'Hanna Moos', 'Frédérique Citeaux', 'Martín Sommer', 'Laurence Lebihan', 'Elizabeth Lincoln',
        'Victoria Ashworth', 'Patricio Simpson', 'Francisco Chang', 'Yang Wang', 'Pedro Afonso', 'Elizabeth Brown', 'Sven Ottlieb', 'Janine Labrune', 'Ann Devon', 'Roland Mendel', 'Aria Cruz', 'Diego Roel',
        'Martine Rancé', 'Maria Larsson', 'Peter Franken', 'Carine Schmitt', 'Paolo Accorti', 'Lino Rodriguez', 'Eduardo Saavedra', 'José Pedro Freyre', 'André Fonseca', 'Howard Snyder', 'Manuel Pereira',
        'Mario Pontes', 'Carlos Hernández', 'Yoshi Latimer', 'Patricia McKenna', 'Helen Bennett', 'Philip Cramer', 'Daniel Tonini', 'Annette Roulet', 'Yoshi Tannamuri', 'John Steel', 'Renate Messner', 'Jaime Yorres',
        'Carlos González', 'Felipe Izquierdo', 'Fran Wilson', 'Giovanni Rovelli', 'Catherine Dewey', 'Jean Fresnière', 'Alexander Feuer', 'Simon Crowther', 'Yvonne Moncada', 'Rene Phillips', 'Henriette Pfalzheim',
        'Marie Bertrand', 'Guillermo Fernández', 'Georg Pipps', 'Isabel de Castro', 'Bernardo Batista', 'Lúcia Carvalho', 'Horst Kloss', 'Sergio Gutiérrez', 'Paula Wilson', 'Maurizio Moroni', 'Janete Limeira', 'Michael Holz',
        'Alejandra Camino', 'Jonas Bergulfsen', 'Jose Pavarotti', 'Hari Kumar', 'Jytte Petersen', 'Dominique Perrier', 'Art Braunschweiger', 'Pascale Cartrain', 'Liz Nixon', 'Liu Wong', 'Karin Josephs', 'Miguel Angel Paolino',
        'Anabela Domingues', 'Helvetius Nagy', 'Palle Ibsen', 'Mary Saveley', 'Paul Henriot', 'Rita Müller', 'Pirkko Koskitalo', 'Paula Parente', 'Karl Jablonski', 'Matti Karttunen', 'Zbyszek Piestrzeniewicz'];
    var customeraddress = ['507 - 20th Ave. E.\r\nApt. 2A', '908 W. Capital Way', '722 Moss Bay Blvd.', '4110 Old Redmond Rd.', '14 Garrett Hill', 'Coventry House\r\nMiner Rd.', 'Edgeham Hollow\r\nWinchester Way',
        '4726 - 11th Ave. N.E.', '7 Houndstooth Rd.', '59 rue de l\'Abbaye', 'Luisenstr. 48', '908 W. Capital Way', '722 Moss Bay Blvd.', '4110 Old Redmond Rd.', '14 Garrett Hill', 'Coventry House\r\nMiner Rd.', 'Edgeham Hollow\r\nWinchester Way',
        '7 Houndstooth Rd.', '2817 Milton Dr.', 'Kirchgasse 6', 'Sierras de Granada 9993', 'Mehrheimerstr. 369', 'Rua da Panificadora, 12', '2817 Milton Dr.', 'Mehrheimerstr. 369'];
    var quantityperunit = ['10 boxes x 20 bags', '24 - 12 oz bottles', '12 - 550 ml bottles', '48 - 6 oz jars', '36 boxes', '12 - 8 oz jars', '12 - 1 lb pkgs.', '12 - 12 oz jars', '18 - 500 g pkgs.', '12 - 200 ml jars',
        '1 kg pkg.', '10 - 500 g pkgs.', '2 kg box', '40 - 100 g pkgs.', '24 - 250 ml bottles', '32 - 500 g boxes', '20 - 1 kg tins', '16 kg pkg.', '10 boxes x 12 pieces', '30 gift boxes', '24 pkgs. x 4 pieces', '24 - 500 g pkgs.', '12 - 250 g pkgs.',
        '12 - 355 ml cans', '20 - 450 g glasses', '100 - 250 g bags'];
    var OrderID = 10248;
    for (var i = 0; i < 20000; i++) {
        lazyLoadData.push({
            'OrderID': OrderID + i,
            'CustomerID': customerid[Math.floor(Math.random() * customerid.length)],
            'CustomerName': customername[Math.floor(Math.random() * customername.length)],
            'CustomerAddress': customeraddress[Math.floor(Math.random() * customeraddress.length)],
            'ProductName': product[Math.floor(Math.random() * product.length)],
            'ProductID': i,
            'Quantity': quantityperunit[Math.floor(Math.random() * quantityperunit.length)]
        });
    }
    return lazyLoadData;
}

Handling the lazy load grouping at server-side

You can use the UrlAdaptor of DataManager when binding the remote data. Along with the default server request, this feature will additionally send the below details to handle the lazy load grouping. In the server end, these details are bound with the IsLazyLoad and OnDemandGroupInfo parameters in the DataManagerRequest model. Please refer to the below table and screenshots.

Property Name Description
isLazyLoad To differentiate the default grouping and lazy load grouping
onDemandGroupInfo Have the details of expanded caption row grouping level, skip, take and filter query of the child records

IsLazyLoad

OnDemandGroupInfo

The following code example describes the lazy load grouping handled at the server-side with other the grid actions.

public IActionResult UrlDatasource([FromBody] DataManagerRequest dm)
{
    IEnumerable groupedData = null;
    IEnumerable<Customers> DataSource = customers;
    DataOperations operation = new DataOperations();

    if (dm.Search != null && dm.Search.Count > 0)
    {
        DataSource = operation.PerformSearching(DataSource, dm.Search);  //Search
    }
    if (dm.Sorted != null && dm.Sorted.Count > 0) //Sorting
    {
        DataSource = operation.PerformSorting(DataSource, dm.Sorted);
    }
    if (dm.Where != null && dm.Where.Count > 0) //Filtering
    {
        DataSource = operation.PerformFiltering(DataSource, dm.Where, dm.Where[0].Operator);
    }
    int count = DataSource.Cast<Customers>().Count();
    if (dm.IsLazyLoad == false && dm.Skip != 0)
    {
        DataSource = operation.PerformSkip(DataSource, dm.Skip); // Paging
    }
    if (dm.IsLazyLoad == false && dm.Take != 0)
    {
        DataSource = operation.PerformTake(DataSource, dm.Take);
    }
    if (dm.IsLazyLoad)
    {
        groupedData = operation.PerformGrouping<Customers>(DataSource, dm); // Lazy load grouping
        if (dm.OnDemandGroupInfo != null && dm.Group.Count() == dm.OnDemandGroupInfo.Level)
        {
            count = groupedData.Cast<Customers>().Count();
        }
        else
        {
            count = groupedData.Cast<Group>().Count();
        }
        groupedData = operation.PerformSkip(groupedData, dm.OnDemandGroupInfo == null ? dm.Skip : dm.OnDemandGroupInfo.Skip);
        groupedData = operation.PerformTake(groupedData, dm.OnDemandGroupInfo == null ? dm.Take : dm.OnDemandGroupInfo.Take);
    }
return dm.RequiresCounts ? Json(new { result = groupedData == null ? DataSource : groupedData, count = count }) : Json(DataSource);
}

Limitations for Lazy load grouping

  • Due to the element height limitation in browsers, the maximum number of records loaded by the grid is limited due to the browser capability.
  • DataManager’s UrlAdaptor and JsonAdaptor only have the built-in lazy load grouping support.
  • Lazy load grouping is not compatible with virtualization, infinite scroll and batch editing, row template etc.
  • Programmatic selection is not supported.

See Also

Exporting grouped records