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Display null date values at the bottom of the grid in React Grid component

By default the null values are displayed at bottom of the Grid row while perform sorting in ascending order. As well as this values are displayed at top of the Grid row while perform sorting with descending order. But you can customize this default order to display the null values at always bottom row of the Grid by using column.sortComparer method.

In the below demo we have displayed the null date values at bottom of the Grid row while sorting the OrderDate column in both ways.

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

export default class App extends React.Component<{}, {action: string}> {
    constructor(props: any) {
      super(props);
      this.state = {action: ''};
    }
    // The custom function
    public sortComparer(reference: any, comparer: any) {
        const sortAsc = this.state.action === "Ascending" ? true : false;
        if (sortAsc && reference === null) {
            return 1;
        } else if (sortAsc && comparer === null) {
            return -1;
        } else if (!sortAsc && reference === null) {
            return -1;
        } else if (!sortAsc && comparer === null) {
            return 1;
        } else {
            return reference - comparer;
        }
    };
    public actionBegin(args: SortEventArgs): void {
        if (args.requestType === "sorting") {
          this.setState({action: args.direction as string});
        }
    }
    public render() {
      this.actionBegin = this.actionBegin.bind(this);
      this.sortComparer = this.sortComparer.bind(this);
      return <GridComponent id='grid' dataSource={data} allowSorting={true} actionBegin={this.actionBegin}>
        <ColumnsDirective>
            <ColumnDirective field='OrderID' headerText='Order ID' width='100' textAlign="Right"/>
            <ColumnDirective field='CustomerID' headerText='Customer ID' width='120'/>
            <ColumnDirective field='OrderDate' headerText='Order Date' format='yMd' sortComparer={this.sortComparer} width='120'/>
            <ColumnDirective field='ShipCountry' headerText='Ship Country' width='150'/>
        </ColumnsDirective>
        <Inject services={[Sort]} />
      </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: null,
        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: null,
        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
    }];

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
    }];