Getting started in EJ2 JavaScript Treegrid control

5 Jul 202424 minutes to read

This section explains the steps required to create a simple Essential JS 2 TreeGrid and demonstrates the basic usage of the TreeGrid control in a JavaScript application.

Dependencies

Following is the list of dependencies to use the TreeGrid with all features.

|-- @syncfusion/ej2-treegrid
     |-- @syncfusion/ej2-treegrid
          |-- @syncfusion/ej2-base
          |-- @syncfusion/ej2-data
          |-- @syncfusion/ej2-buttons
          |-- @syncfusion/ej2-popups
          |-- @syncfusion/ej2-navigations
          |-- @syncfusion/ej2-dropdowns
          |-- @syncfusion/ej2-lists
          |-- @syncfusion/ej2-inputs
          |-- @syncfusion/ej2-splitbuttons
          |-- @syncfusion/ej2-calendars
          |-- @syncfusion/ej2-excel-export
          |-- @syncfusion/ej2-pdf-export
          |-- @syncfusion/ej2-file-utils
          |-- @syncfusion/ej2-compression

Setup for local environment

Refer to the following steps to setup your local environment.

Step 1: Create a root folder myapp for your application.

Step 2: Create myapp/resources folder to store local scripts and styles files.

Step 3: Create myapp/index.js and myapp/index.html files for initializing Essential JS 2 TreeGrid control.

Adding Syncfusion resources

The Essential JS 2 TreeGrid control can be initialized by using either of the following ways.

  • Using local script and style.
  • Using CDN link for script and style.

Using local script and style

You can get the global scripts and styles from the Essential Studio JavaScript (Essential JS 2) build installed location.

After installing the Essential JS 2 product build, copy the TreeGrid and its dependencies scripts and style file into the resources/scripts and resources/styles folder.

Refer to the following code to find location TreeGrid’s script and style file.

Syntax:

Script: **(installed location)**/Syncfusion/Essential Studio/{RELEASE_VERSION}/Essential JS 2/{PACKAGE_NAME}/dist/global/{PACKAGE_NAME}.min.js

Styles: **(installed location)**/Syncfusion/Essential Studio/{RELEASE_VERSION}/Essential JS 2/{PACKAGE_NAME}/styles/material.css

Example:

Script: C:/Program Files (x86)/Syncfusion/Essential Studio/26.1.35/Essential JS 2/ej2-treegrid/dist/global/ej2-treegrid.min.js

Styles: C:/Program Files (x86)/Syncfusion/Essential Studio/26.1.35/Essential JS 2/ej2-treegrid/styles/material.css

After copying the files, refer the TreeGrid’s scripts and styles into the index.html file.
The following HTML code example shows the minimal dependency of TreeGrid.


<!DOCTYPE html>
  <html xmlns="http://www.w3.org/1999/xhtml">
       <head>
            <title>Essential JS 2 TreeGrid</title>
            <!-- Essential JS 2 TreeGrid's dependent material theme -->
            <link href="resources/base/styles/material.css" rel="stylesheet" type="text/css"/>
            <link href="resources/popups/styles/material.css" rel="stylesheet" type="text/css"/>
            <!-- Essential JS 2 material theme -->
            <link href="resources/treegrid/styles/material.css" rel="stylesheet" type="text/css"/>

            <!-- Essential JS 2 TreeGrid's dependent scripts -->
            <script src="resources/scripts/ej2-base.min.js" type="text/javascript"></script>
            <script src="resources/scripts/ej2-data.min.js" type="text/javascript"></script>
            <script src="resources/scripts/ej2-popups.min.js" type="text/javascript"></script>
            <script src="resources/scripts/ej2-grids.min.js" type="text/javascript"></script>
            <!-- Essential JS 2 TreeGrid's global script -->
            <script src="resources/scripts/ej2-treegrid.min.js" type="text/javascript"></script>
       </head>
       <body>
       </body>
  </html>

Using CDN link, you can directly refer the TreeGrid control’s script and style into the index.html.

Refer to the TreeGrid’s CDN links as follows.

Syntax:

Script: http://cdn.syncfusion.com/ej2/{RELEASE_VERSION}/{PACKAGE_NAME}/dist/global/{PACKAGE_NAME}.min.js

Styles: http://cdn.syncfusion.com/ej2/{RELEASE_VERSION}/{PACKAGE_NAME}/styles/material.css

Example:

Script: http://cdn.syncfusion.com/ej2/26.1.35/ej2-treegrid/dist/global/ej2-treegrid.min.js

Styles: http://cdn.syncfusion.com/ej2/26.1.35/ej2-treegrid/styles/material.css

The following HTML code example shows the minimal dependency of TreeGrid.

<!DOCTYPE html>
  <html xmlns="http://www.w3.org/1999/xhtml">
       <head>
            <title>Essential JS 2 TreeGrid</title>
            <!-- Essential JS 2 TreeGrid's dependent material theme -->
            <link href="http://cdn.syncfusion.com/ej2/26.1.35/ej2-base/styles/material.css" rel="stylesheet" type="text/css"/>
            <link href="http://cdn.syncfusion.com/ej2/26.1.35/ej2-popups/styles/material.css" rel="stylesheet" type="text/css"/>
            <link href="http://cdn.syncfusion.com/ej2/26.1.35/ej2-grids/styles/material.css" rel="stylesheet" type="text/css"/>
            <!-- Essential JS 2 material theme -->
            <link href="http://cdn.syncfusion.com/ej2/26.1.35/ej2-treegrid/styles/material.css" rel="stylesheet" type="text/css"/>

            <!-- Essential JS 2 TreeGrid's dependent script -->
            <script src="http://cdn.syncfusion.com/ej2/26.1.35/ej2-base/dist/global/ej2-base.min.js" type="text/javascript"></script>
            <script src="http://cdn.syncfusion.com/ej2/26.1.35/ej2-data/dist/global/ej2-data.min.js" type="text/javascript"></script>
            <script src="http://cdn.syncfusion.com/ej2/26.1.35/ej2-popups/dist/global/ej2-popups.min.js" type="text/javascript"></script>
            <script src="http://cdn.syncfusion.com/ej2/26.1.35/ej2-grids/dist/global/ej2-grids.min.js" type="text/javascript"></script>
            <!-- Essential JS 2 TreeGrid's global script -->
            <script src="http://cdn.syncfusion.com/ej2/26.1.35/ej2-treegrid/dist/global/ej2-treegrid.min.js" type="text/javascript"></script>
       </head>
       <body>
       </body>
  </html>

Adding TreeGrid control

Now, you can start adding TreeGrid control in the application. For getting started, add a div element for TreeGrid control in index.html. Then refer the index.js file into the index.html file.

In this document context, the ej2.min.js is used, which includes all the Essential JS 2 components and its dependent scripts.

<!DOCTYPE html>
  <html xmlns="http://www.w3.org/1999/xhtml">
       <head>
            <title>Essential JS 2 TreeGrid</title>
            <!-- Essential JS 2 TreeGrid's dependent material theme -->
            <link href="http://cdn.syncfusion.com/ej2/26.1.35/ej2-base/styles/material.css" rel="stylesheet" type="text/css"/>
            <link href="http://cdn.syncfusion.com/ej2/26.1.35/ej2-popups/styles/material.css" rel="stylesheet" type="text/css"/>
            <link href="http://cdn.syncfusion.com/ej2/26.1.35/ej2-grids/styles/material.css" rel="stylesheet" type="text/css"/>
            <!-- Essential JS 2 material theme -->
            <link href="http://cdn.syncfusion.com/ej2/26.1.35/ej2-treegrid/styles/material.css" rel="stylesheet" type="text/css"/>

            <!-- Essential JS 2 all script -->
            <script src="http://cdn.syncfusion.com/ej2/26.1.35/dist/ej2.min.js" type="text/javascript"></script>
       </head>
       <body>
           <!-- Add the HTML <div> element for TreeGrid  -->
             <div id="TreeGrid"></div>
             <script src="index.js" type="text/javascript"></script>
       </body>
  </html>

Place the following TreeGrid code in the index.js.

var treeGridObj = ej.treegrid.TreeGrid();
treeGridObj.appendTo('#TreeGrid');

Defining Row Data

Data for the TreeGrid control is bind by using the dataSource property. It accepts either an array of JavaScript object or DataManager instance.

<!DOCTYPE html>
  <html xmlns="http://www.w3.org/1999/xhtml">
       <head>
            <title>Essential JS 2 TreeGrid</title>
            <!-- Essential JS 2 TreeGrid's dependent material theme -->
            <link href="http://cdn.syncfusion.com/ej2/26.1.35/ej2-base/styles/material.css" rel="stylesheet" type="text/css"/>
            <link href="http://cdn.syncfusion.com/ej2/26.1.35/ej2-popups/styles/material.css" rel="stylesheet" type="text/css"/>
            <link href="http://cdn.syncfusion.com/ej2/26.1.35/ej2-grids/styles/material.css" rel="stylesheet" type="text/css"/>
            <!-- Essential JS 2 material theme -->
            <link href="http://cdn.syncfusion.com/ej2/26.1.35/ej2-treegrid/styles/material.css" rel="stylesheet" type="text/css"/>

            <!-- Essential JS 2 all script -->
            <script src="http://cdn.syncfusion.com/ej2/26.1.35/dist/ej2.min.js" type="text/javascript"></script>
       </head>
       <body>
           <!-- Add the HTML <div> element for TreeGrid  -->
             <div id="TreeGrid"></div>
             <script src="index.js" type="text/javascript"></script>
       </body>
  </html>

Place the following TreeGrid code in the index.js.

var sampleData = [
    {
        taskID: 1,
        taskName: 'Planning',
        startDate: new Date('02/03/2017'),
        duration: 5,
        subtasks: [
            { taskID: 2, taskName: 'Plan timeline', startDate: new Date('02/03/2017'), duration: 5 },
            { taskID: 3, taskName: 'Plan budget', startDate: new Date('02/03/2017'), duration: 5},
            { taskID: 4, taskName: 'Allocate resources', startDate: new Date('02/03/2017'), duration: 5},
            { taskID: 5, taskName: 'Planning complete', startDate: new Date('02/07/2017'), duration: 0}
        ]
    }];
var treeGridObj = ej.treegrid.TreeGrid({dataSource: sampleData});
treeGridObj.appendTo('#TreeGrid');

Defining Columns

The TreeGrid has an option to define the columns as an array. In these columns, the following properties are used to customize the columns.

  • The field has been added to map with a property name in an array of JavaScript objects.
  • The headerText has been added to change the title of columns.
  • The textAlign has been added to change the alignment of columns. By default, columns will be left aligned. To change the columns to right align, define textAlign to Right.
  • Also, the another useful property, format has been used. Using this, you can format number and date values to standard or custom formats. Here, it is defined for the conversion of numeric values to currency.

Tree Column which is used to expand or collapse child rows is defined by using treeColumnIndex property.

var sampleData = [
    {
        taskID: 1,
        taskName: 'Planning',
        startDate: new Date('02/03/2017'),
        duration: 5,
        subtasks: [
            { taskID: 2, taskName: 'Plan timeline', startDate: new Date('02/03/2017'), duration: 5 },
            { taskID: 3, taskName: 'Plan budget', startDate: new Date('02/03/2017'), duration: 5},
            { taskID: 4, taskName: 'Allocate resources', startDate: new Date('02/03/2017'), duration: 5},
            { taskID: 5, taskName: 'Planning complete', startDate: new Date('02/07/2017'), duration: 0}
        ]
    }];
var treeGridObj = ej.treegrid.TreeGrid({
    dataSource: sampleData,
    childMapping: 'subtasks',
    treeColumnIndex: 1,
    columns: [
                { field: 'taskID', headerText: 'Task ID', width: 70, textAlign: 'Right' },
                { field: 'taskName', headerText: 'Task Name', width: 200, textAlign: 'Left' },
                {
                    field: 'startDate', headerText: 'Start Date', width: 90, textAlign: 'Right', type: 'date',format: 'yMd'
                },
                { field: 'duration', headerText: 'Duration', width: 80, textAlign: 'Right' }
    ],
    height: 380
});
treeGridObj.appendTo('#TreeGrid');

In the above code example, the hierarchical data binding is represented in which the chilMapping property denotes the hierarchy relationship; whereas in self-referencing data binding idMapping and parentIdMapping denotes the hierarchy relationship.

Module injection

To create a treegrid with additional features, inject the required modules. The following modules are used to extend TreeGrid’s basic functionality.

  • Page: Inject this module to use paging feature.
  • Sort: Inject this module to use sorting feature.
  • Filter: Inject this module to use filtering feature.
  • ExcelExport: Inject this module to use Excel export feature.
  • PdfExport: Inject this module to use PDF export feature.

These modules should be injected into the TreeGrid using the ej.treegrid.TreeGrid.Inject method.

Additional feature modules are available here.

Enable paging

The paging feature enables users to view the TreeGrid record in a paged view. It can be enabled by setting the allowPaging property to true. Inject the Page
module as follows. If the Page module is not injected, the pager will not be rendered in the TreeGrid. The pager can be customized using the pageSettings property.

In root-level paging mode, paging is based on the root-level rows only, i.e., it ignores the child row count and it can be enabled by using the pageSettings.pageSizeMode property.

ej.treegrid.TreeGrid.Inject(ej.treegrid.Page);
var treeGridObj = new ej.treegrid.TreeGrid({
    dataSource: sampleData,
    childMapping: 'subtasks',
    treeColumnIndex: 1,
    allowPaging: true,
    pageSettings: { pageSize: 7 },
    columns: [
                { field: 'taskID', headerText: 'Task ID', width: 90, textAlign: 'Right' },
                { field: 'taskName', headerText: 'Task Name', width: 180, textAlign: 'Left' },
                {
                    field: 'startDate', headerText: 'Start Date', width: 90, textAlign: 'Right', type: 'date', format: 'yMd' 
                },
                { field: 'duration', headerText: 'Duration', width: 80, textAlign: 'Right' }
    ]
});

treeGridObj.appendTo('#TreeGrid');
/**
 * TreeGrid DataSource
 */

window.sampleData =  [
    {
        taskID: 1,
        taskName: 'Planning',
        startDate: new Date('02/03/2017'),
        endDate: new Date('02/07/2017'),
        progress: 100,
        duration: 5,
        priority: 'Normal',
        approved: false,
        subtasks: [
            { taskID: 2, taskName: 'Plan timeline', startDate: new Date('02/03/2017'),
                endDate: new Date('02/07/2017'), duration: 5, progress: 100, priority: 'Normal', approved: false },
            { taskID: 3, taskName: 'Plan budget', startDate: new Date('02/03/2017'),
                endDate: new Date('02/07/2017'), duration: 5, progress: 100, priority: 'Low', approved: true },
            { taskID: 4, taskName: 'Allocate resources', startDate: new Date('02/03/2017'),
                endDate: new Date('02/07/2017'), duration: 5, progress: 100, priority: 'Critical', approved: false },
            { taskID: 5, taskName: 'Planning complete', startDate: new Date('02/07/2017'),
                endDate: new Date('02/07/2017'), duration: 0, progress: 0, priority: 'Low', approved: true }
        ]
    },
    {
        taskID: 6,
        taskName: 'Design',
        startDate: new Date('02/10/2017'),
        endDate: new Date('02/14/2017'),
        duration: 3,
        progress: 86,
        priority: 'High',
        approved: false,
        subtasks: [
            { taskID: 7, taskName: 'Software Specification', startDate: new Date('02/10/2017'),
                endDate: new Date('02/12/2017'), duration: 3, progress: 60, priority: 'Normal', approved: false },
            { taskID: 8, taskName: 'Develop prototype', startDate: new Date('02/10/2017'),
                endDate: new Date('02/12/2017'), duration: 3, progress: 100, priority: 'Critical', approved: false },
            { taskID: 9, taskName: 'Get approval from customer', startDate: new Date('02/13/2017'),
                endDate: new Date('02/14/2017'), duration: 2, progress: 100, priority: 'Low', approved: true },
            { taskID: 10, taskName: 'Design Documentation', startDate: new Date('02/13/2017'),
                endDate: new Date('02/14/2017'), duration: 2, progress: 100, priority: 'High', approved: true },
            { taskID: 11, taskName: 'Design complete', startDate: new Date('02/14/2017'),
                endDate: new Date('02/14/2017'), duration: 0, progress: 0, priority: 'Normal', approved: true }
        ]
    },
    {
        taskID: 12,
        taskName: 'Implementation Phase',
        startDate: new Date('02/17/2017'),
        endDate: new Date('02/27/2017'),
        priority: 'Normal',
        approved: false,
        duration: 11,
        progress: 66,
        subtasks: [
            {
                taskID: 13,
                taskName: 'Phase 1',
                startDate: new Date('02/17/2017'),
                endDate: new Date('02/27/2017'),
                priority: 'High',
                approved: false,
                progress: 50,
                duration: 11,
                subtasks: [{
                    taskID: 14,
                    taskName: 'Implementation Module 1',
                    startDate: new Date('02/17/2017'),
                    endDate: new Date('02/27/2017'),
                    priority: 'Normal',
                    duration: 11,
                    progress: 10,
                    approved: false,
                    subtasks: [
                        { taskID: 15, taskName: 'Development Task 1', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'High', approved: false },
                        { taskID: 16, taskName: 'Development Task 2', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'Low', approved: true },
                        { taskID: 17, taskName: 'Testing', startDate: new Date('02/20/2017'),
                            endDate: new Date('02/21/2017'), duration: 2, progress: '0', priority: 'Normal', approved: true },
                        { taskID: 18, taskName: 'Bug fix', startDate: new Date('02/24/2017'),
                            endDate: new Date('02/25/2017'), duration: 2, progress: '0', priority: 'Critical', approved: false },
                        { taskID: 19, taskName: 'Customer review meeting', startDate: new Date('02/26/2017'),
                            endDate: new Date('02/27/2017'), duration: 2, progress: '0', priority: 'High', approved: false },
                        { taskID: 20, taskName: 'Phase 1 complete', startDate: new Date('02/27/2017'),
                            endDate: new Date('02/27/2017'), duration: 0, progress: '50', priority: 'Low', approved: true }

                    ]
                }]
            },
            {
                taskID: 21,
                taskName: 'Phase 2',
                startDate: new Date('02/17/2017'),
                endDate: new Date('02/28/2017'),
                priority: 'High',
                approved: false,
                duration: 12,
                progress: 60,
                subtasks: [{
                    taskID: 22,
                    taskName: 'Implementation Module 2',
                    startDate: new Date('02/17/2017'),
                    endDate: new Date('02/28/2017'),
                    priority: 'Critical',
                    approved: false,
                    duration: 12,
                    progress: 90,
                    subtasks: [
                        { taskID: 23, taskName: 'Development Task 1', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/20/2017'), duration: 4, progress: '50', priority: 'Normal', approved: true },
                        { taskID: 24, taskName: 'Development Task 2', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/20/2017'), duration: 4, progress: '50', priority: 'Critical', approved: true },
                        { taskID: 25, taskName: 'Testing', startDate: new Date('02/21/2017'),
                            endDate: new Date('02/24/2017'), duration: 2, progress: '0', priority: 'High', approved: false },
                        { taskID: 26, taskName: 'Bug fix', startDate: new Date('02/25/2017'),
                            endDate: new Date('02/26/2017'), duration: 2, progress: '0', priority: 'Low', approved: false },
                        { taskID: 27, taskName: 'Customer review meeting', startDate: new Date('02/27/2017'),
                            endDate: new Date('02/28/2017'), duration: 2, progress: '0', priority: 'Critical', approved: true },
                        { taskID: 28, taskName: 'Phase 2 complete', startDate: new Date('02/28/2017'),
                            endDate: new Date('02/28/2017'), duration: 0, progress: '50', priority: 'Normal', approved: false }

                    ]
                }]
            },

            {
                taskID: 29,
                taskName: 'Phase 3',
                startDate: new Date('02/17/2017'),
                endDate: new Date('02/27/2017'),
                priority: 'Normal',
                approved: false,
                duration: 11,
                progress: 30,
                subtasks: [{
                    taskID: 30,
                    taskName: 'Implementation Module 3',
                    startDate: new Date('02/17/2017'),
                    endDate: new Date('02/27/2017'),
                    priority: 'High',
                    approved: false,
                    duration: 11,
                    progress: 60,
                    subtasks: [
                        { taskID: 31, taskName: 'Development Task 1', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'Low', approved: true },
                        { taskID: 32, taskName: 'Development Task 2', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'Normal', approved: false },
                        { taskID: 33, taskName: 'Testing', startDate: new Date('02/20/2017'),
                            endDate: new Date('02/21/2017'), duration: 2, progress: '0', priority: 'Critical', approved: true },
                        { taskID: 34, taskName: 'Bug fix', startDate: new Date('02/24/2017'),
                            endDate: new Date('02/25/2017'), duration: 2, progress: '0', priority: 'High', approved: false },
                        { taskID: 35, taskName: 'Customer review meeting', startDate: new Date('02/26/2017'),
                            endDate: new Date('02/27/2017'), duration: 2, progress: '0', priority: 'Normal', approved: true },
                        { taskID: 36, taskName: 'Phase 3 complete', startDate: new Date('02/27/2017'),
                            endDate: new Date('02/27/2017'), duration: 0, progress: '50', priority: 'Critical', approved: false },
                    ]
                }]
            }
        ]
    }
];

window.sortData = [
    {
        orderID: '1',
        orderName: 'Order 1',
        orderDate: new Date('02/03/2017'),
        shippedDate: new Date('02/09/2017'),
        units: '1395',
        unitPrice: '47',
        price: '133.66',
        Category: 'Products',
        subtasks: [
            { orderID: '1.1', orderName: 'Mackerel', Category: 'Frozen seafood', units: '235',
            orderDate: new Date('03/03/2017'), shippedDate: new Date('03/10/2017'), unitPrice: '12', price: '28.20' },
            { orderID: '1.2', orderName: 'Yellowfin Tuna', Category: 'Frozen seafood', units: '324',
            orderDate: new Date('04/05/2017'), shippedDate: new Date('04/12/2017'), unitPrice: '8', price: '25.92' },
            { orderID: '1.3', orderName: 'Herrings', Category: 'Frozen seafood', units: '488',
            orderDate: new Date('05/08/2017'), shippedDate: new Date('05/15/2017'), unitPrice: '11', price: '52.68' },
            { orderID: '1.4', orderName: 'Preserved Olives', Category: 'Edible', units: '125',
            orderDate: new Date('06/10/2017'), shippedDate: new Date('06/17/2017'), unitPrice: '9', price: '11.25' },
            { orderID: '1.5', orderName: 'Sweet corn Frozen', Category: 'Edible', units: '223',
            orderDate: new Date('07/12/2017'), shippedDate: new Date('07/19/2019'), unitPrice: '7', price: '15.61' }
         ]
    },
    {
        orderID: '2',
        orderName: 'Order 2',
        orderDate: new Date('01/10/2018'),
        shippedDate: new Date('01/16/2018'),
        units: '1944',
        unitPrice: '58',
        price: '212.33',
        Category:'SeaFood',
        subtasks: [
            { orderID: '2.1', orderName: 'Tilapias', Category: 'Frozen seafood',
            orderDate: new Date('02/05/2018'), shippedDate: new Date('02/12/2018'), units: '278', unitPrice: '15', price: '41.70' },
            { orderID: '2.2', orderName: 'White Shrimp', Category: 'Frozen seafood', units: '560',
            orderDate: new Date('05/22/2018'), shippedDate: new Date('05/29/2018'), unitPrice: '7', price: '39.20' },
            { orderID: '2.3', orderName: 'Fresh Cheese', Category: 'Dairy', units: '323', unitPrice: '12',
            orderDate: new Date('06/08/2018'), shippedDate: new Date('06/15/2018'), price: '38.76' },
            { orderID: '2.4', orderName: 'Blue Veined Cheese', Category: 'Dairy', units: '370', unitPrice: '15',
            orderDate: new Date('07/10/2018'), shippedDate: new Date('07/17/2018'), price: '55.50' },
            { orderID: '2.5', orderName: 'Butter', Category: 'Dairy', units: '413', unitPrice: '9',
            orderDate: new Date('09/18/2018'), shippedDate: new Date('09/25/2018'), price: '37.17' }
        ]
    },
    {
        orderID: '3',
        orderName: 'Order 3',
        orderDate: new Date('09/10/2018'),
        shippedDate: new Date('09/20/2018'),
        units: '1120',
        unitPrice: '33',
        price: '108.80',
        Category:'Crystals',
        subtasks: [
            { orderID: '3.1', orderName: 'Lead glassware', Category: 'Solid crystals',
            orderDate: new Date('02/07/2018'), shippedDate: new Date('02/14/2018'), units: '542', unitPrice: '6', price: '32.52' },
            { orderID: '3.2', orderName: 'Pharmaceutical Glassware', Category: 'Solid crystals',
            orderDate: new Date('04/19/2018'), shippedDate: new Date('04/26/2018'), units: '324', unitPrice: '11', price: '35.64' },
            { orderID: '3.3', orderName: 'Glass beads', Category: 'Solid crystals', units: '254',
            orderDate: new Date('05/22/2018'), shippedDate: new Date('03/22/2018'), unitPrice: '16', price: '40.64' }
        ]
    }

];
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Grid</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Grid Control">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-base/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-grids/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-treegrid/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-dropdowns/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-calendars/styles/material.css" rel="stylesheet">
    
    
    
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    
    
    
    
<script src="https://cdn.syncfusion.com/ej2/26.1.35/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <div id="TreeGrid"></div>        
    </div>

<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Enable sorting

The sorting feature enables you to order the records. It can be enabled by setting the allowSorting property to true. Inject the Sort
module as follows. If the Sort module is not injected, you cannot sort when a header is clicked. Sorting feature can be customized using the sortSettings property.

ej.treegrid.TreeGrid.Inject(ej.treegrid.Page, ej.treegrid.Sort);
var treeGridObj = new ej.treegrid.TreeGrid({
    dataSource: sortData,
    childMapping: 'subtasks',
    treeColumnIndex: 1,
    allowSorting: true,
    sortSettings: { columns: [{ field: 'Category', direction: 'Ascending' }, { field: 'orderName', direction: 'Ascending' }] },
    allowPaging: true,
    columns: [
                { field: 'orderName', headerText: 'Order Name', width: 170 },
                { field: 'Category', headerText: 'Category', width: 150 },
                { field: 'orderDate', headerText: 'Order Date', width: 130, textAlign: 'Right', format: 'yMd',    type: 'date' },
                { field: 'price', headerText: 'Price', width: 100, format: 'C0', textAlign: 'Right' }
    ],
    height: 260
});
treeGridObj.appendTo('#TreeGrid');
/**
 * TreeGrid DataSource
 */

window.sampleData =  [
    {
        taskID: 1,
        taskName: 'Planning',
        startDate: new Date('02/03/2017'),
        endDate: new Date('02/07/2017'),
        progress: 100,
        duration: 5,
        priority: 'Normal',
        approved: false,
        subtasks: [
            { taskID: 2, taskName: 'Plan timeline', startDate: new Date('02/03/2017'),
                endDate: new Date('02/07/2017'), duration: 5, progress: 100, priority: 'Normal', approved: false },
            { taskID: 3, taskName: 'Plan budget', startDate: new Date('02/03/2017'),
                endDate: new Date('02/07/2017'), duration: 5, progress: 100, priority: 'Low', approved: true },
            { taskID: 4, taskName: 'Allocate resources', startDate: new Date('02/03/2017'),
                endDate: new Date('02/07/2017'), duration: 5, progress: 100, priority: 'Critical', approved: false },
            { taskID: 5, taskName: 'Planning complete', startDate: new Date('02/07/2017'),
                endDate: new Date('02/07/2017'), duration: 0, progress: 0, priority: 'Low', approved: true }
        ]
    },
    {
        taskID: 6,
        taskName: 'Design',
        startDate: new Date('02/10/2017'),
        endDate: new Date('02/14/2017'),
        duration: 3,
        progress: 86,
        priority: 'High',
        approved: false,
        subtasks: [
            { taskID: 7, taskName: 'Software Specification', startDate: new Date('02/10/2017'),
                endDate: new Date('02/12/2017'), duration: 3, progress: 60, priority: 'Normal', approved: false },
            { taskID: 8, taskName: 'Develop prototype', startDate: new Date('02/10/2017'),
                endDate: new Date('02/12/2017'), duration: 3, progress: 100, priority: 'Critical', approved: false },
            { taskID: 9, taskName: 'Get approval from customer', startDate: new Date('02/13/2017'),
                endDate: new Date('02/14/2017'), duration: 2, progress: 100, priority: 'Low', approved: true },
            { taskID: 10, taskName: 'Design Documentation', startDate: new Date('02/13/2017'),
                endDate: new Date('02/14/2017'), duration: 2, progress: 100, priority: 'High', approved: true },
            { taskID: 11, taskName: 'Design complete', startDate: new Date('02/14/2017'),
                endDate: new Date('02/14/2017'), duration: 0, progress: 0, priority: 'Normal', approved: true }
        ]
    },
    {
        taskID: 12,
        taskName: 'Implementation Phase',
        startDate: new Date('02/17/2017'),
        endDate: new Date('02/27/2017'),
        priority: 'Normal',
        approved: false,
        duration: 11,
        progress: 66,
        subtasks: [
            {
                taskID: 13,
                taskName: 'Phase 1',
                startDate: new Date('02/17/2017'),
                endDate: new Date('02/27/2017'),
                priority: 'High',
                approved: false,
                progress: 50,
                duration: 11,
                subtasks: [{
                    taskID: 14,
                    taskName: 'Implementation Module 1',
                    startDate: new Date('02/17/2017'),
                    endDate: new Date('02/27/2017'),
                    priority: 'Normal',
                    duration: 11,
                    progress: 10,
                    approved: false,
                    subtasks: [
                        { taskID: 15, taskName: 'Development Task 1', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'High', approved: false },
                        { taskID: 16, taskName: 'Development Task 2', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'Low', approved: true },
                        { taskID: 17, taskName: 'Testing', startDate: new Date('02/20/2017'),
                            endDate: new Date('02/21/2017'), duration: 2, progress: '0', priority: 'Normal', approved: true },
                        { taskID: 18, taskName: 'Bug fix', startDate: new Date('02/24/2017'),
                            endDate: new Date('02/25/2017'), duration: 2, progress: '0', priority: 'Critical', approved: false },
                        { taskID: 19, taskName: 'Customer review meeting', startDate: new Date('02/26/2017'),
                            endDate: new Date('02/27/2017'), duration: 2, progress: '0', priority: 'High', approved: false },
                        { taskID: 20, taskName: 'Phase 1 complete', startDate: new Date('02/27/2017'),
                            endDate: new Date('02/27/2017'), duration: 0, progress: '50', priority: 'Low', approved: true }

                    ]
                }]
            },
            {
                taskID: 21,
                taskName: 'Phase 2',
                startDate: new Date('02/17/2017'),
                endDate: new Date('02/28/2017'),
                priority: 'High',
                approved: false,
                duration: 12,
                progress: 60,
                subtasks: [{
                    taskID: 22,
                    taskName: 'Implementation Module 2',
                    startDate: new Date('02/17/2017'),
                    endDate: new Date('02/28/2017'),
                    priority: 'Critical',
                    approved: false,
                    duration: 12,
                    progress: 90,
                    subtasks: [
                        { taskID: 23, taskName: 'Development Task 1', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/20/2017'), duration: 4, progress: '50', priority: 'Normal', approved: true },
                        { taskID: 24, taskName: 'Development Task 2', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/20/2017'), duration: 4, progress: '50', priority: 'Critical', approved: true },
                        { taskID: 25, taskName: 'Testing', startDate: new Date('02/21/2017'),
                            endDate: new Date('02/24/2017'), duration: 2, progress: '0', priority: 'High', approved: false },
                        { taskID: 26, taskName: 'Bug fix', startDate: new Date('02/25/2017'),
                            endDate: new Date('02/26/2017'), duration: 2, progress: '0', priority: 'Low', approved: false },
                        { taskID: 27, taskName: 'Customer review meeting', startDate: new Date('02/27/2017'),
                            endDate: new Date('02/28/2017'), duration: 2, progress: '0', priority: 'Critical', approved: true },
                        { taskID: 28, taskName: 'Phase 2 complete', startDate: new Date('02/28/2017'),
                            endDate: new Date('02/28/2017'), duration: 0, progress: '50', priority: 'Normal', approved: false }

                    ]
                }]
            },

            {
                taskID: 29,
                taskName: 'Phase 3',
                startDate: new Date('02/17/2017'),
                endDate: new Date('02/27/2017'),
                priority: 'Normal',
                approved: false,
                duration: 11,
                progress: 30,
                subtasks: [{
                    taskID: 30,
                    taskName: 'Implementation Module 3',
                    startDate: new Date('02/17/2017'),
                    endDate: new Date('02/27/2017'),
                    priority: 'High',
                    approved: false,
                    duration: 11,
                    progress: 60,
                    subtasks: [
                        { taskID: 31, taskName: 'Development Task 1', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'Low', approved: true },
                        { taskID: 32, taskName: 'Development Task 2', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'Normal', approved: false },
                        { taskID: 33, taskName: 'Testing', startDate: new Date('02/20/2017'),
                            endDate: new Date('02/21/2017'), duration: 2, progress: '0', priority: 'Critical', approved: true },
                        { taskID: 34, taskName: 'Bug fix', startDate: new Date('02/24/2017'),
                            endDate: new Date('02/25/2017'), duration: 2, progress: '0', priority: 'High', approved: false },
                        { taskID: 35, taskName: 'Customer review meeting', startDate: new Date('02/26/2017'),
                            endDate: new Date('02/27/2017'), duration: 2, progress: '0', priority: 'Normal', approved: true },
                        { taskID: 36, taskName: 'Phase 3 complete', startDate: new Date('02/27/2017'),
                            endDate: new Date('02/27/2017'), duration: 0, progress: '50', priority: 'Critical', approved: false },
                    ]
                }]
            }
        ]
    }
];

window.sortData = [
    {
        orderID: '1',
        orderName: 'Order 1',
        orderDate: new Date('02/03/2017'),
        shippedDate: new Date('02/09/2017'),
        units: '1395',
        unitPrice: '47',
        price: '133.66',
        Category: 'Products',
        subtasks: [
            { orderID: '1.1', orderName: 'Mackerel', Category: 'Frozen seafood', units: '235',
            orderDate: new Date('03/03/2017'), shippedDate: new Date('03/10/2017'), unitPrice: '12', price: '28.20' },
            { orderID: '1.2', orderName: 'Yellowfin Tuna', Category: 'Frozen seafood', units: '324',
            orderDate: new Date('04/05/2017'), shippedDate: new Date('04/12/2017'), unitPrice: '8', price: '25.92' },
            { orderID: '1.3', orderName: 'Herrings', Category: 'Frozen seafood', units: '488',
            orderDate: new Date('05/08/2017'), shippedDate: new Date('05/15/2017'), unitPrice: '11', price: '52.68' },
            { orderID: '1.4', orderName: 'Preserved Olives', Category: 'Edible', units: '125',
            orderDate: new Date('06/10/2017'), shippedDate: new Date('06/17/2017'), unitPrice: '9', price: '11.25' },
            { orderID: '1.5', orderName: 'Sweet corn Frozen', Category: 'Edible', units: '223',
            orderDate: new Date('07/12/2017'), shippedDate: new Date('07/19/2019'), unitPrice: '7', price: '15.61' }
         ]
    },
    {
        orderID: '2',
        orderName: 'Order 2',
        orderDate: new Date('01/10/2018'),
        shippedDate: new Date('01/16/2018'),
        units: '1944',
        unitPrice: '58',
        price: '212.33',
        Category:'SeaFood',
        subtasks: [
            { orderID: '2.1', orderName: 'Tilapias', Category: 'Frozen seafood',
            orderDate: new Date('02/05/2018'), shippedDate: new Date('02/12/2018'), units: '278', unitPrice: '15', price: '41.70' },
            { orderID: '2.2', orderName: 'White Shrimp', Category: 'Frozen seafood', units: '560',
            orderDate: new Date('05/22/2018'), shippedDate: new Date('05/29/2018'), unitPrice: '7', price: '39.20' },
            { orderID: '2.3', orderName: 'Fresh Cheese', Category: 'Dairy', units: '323', unitPrice: '12',
            orderDate: new Date('06/08/2018'), shippedDate: new Date('06/15/2018'), price: '38.76' },
            { orderID: '2.4', orderName: 'Blue Veined Cheese', Category: 'Dairy', units: '370', unitPrice: '15',
            orderDate: new Date('07/10/2018'), shippedDate: new Date('07/17/2018'), price: '55.50' },
            { orderID: '2.5', orderName: 'Butter', Category: 'Dairy', units: '413', unitPrice: '9',
            orderDate: new Date('09/18/2018'), shippedDate: new Date('09/25/2018'), price: '37.17' }
        ]
    },
    {
        orderID: '3',
        orderName: 'Order 3',
        orderDate: new Date('09/10/2018'),
        shippedDate: new Date('09/20/2018'),
        units: '1120',
        unitPrice: '33',
        price: '108.80',
        Category:'Crystals',
        subtasks: [
            { orderID: '3.1', orderName: 'Lead glassware', Category: 'Solid crystals',
            orderDate: new Date('02/07/2018'), shippedDate: new Date('02/14/2018'), units: '542', unitPrice: '6', price: '32.52' },
            { orderID: '3.2', orderName: 'Pharmaceutical Glassware', Category: 'Solid crystals',
            orderDate: new Date('04/19/2018'), shippedDate: new Date('04/26/2018'), units: '324', unitPrice: '11', price: '35.64' },
            { orderID: '3.3', orderName: 'Glass beads', Category: 'Solid crystals', units: '254',
            orderDate: new Date('05/22/2018'), shippedDate: new Date('03/22/2018'), unitPrice: '16', price: '40.64' }
        ]
    }

];
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Grid</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Grid Control">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-base/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-grids/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-treegrid/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-dropdowns/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-calendars/styles/material.css" rel="stylesheet">
    
    
    
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    
    
    
    
<script src="https://cdn.syncfusion.com/ej2/26.1.35/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <div id="TreeGrid"></div>        
    </div>

<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Enable filtering

The filtering feature enables you to view the reduced amount of records based on the filter criteria. It can be enabled by setting the allowFiltering property to true. The [Filter] module has to be injected as follows.
If the [Filter] module is not injected, filter bar will not be rendered in the TreeGrid. Filtering feature can be customized using the filterSettings property.

By default, filtered records are shown along with its parent records. This behavior can be changed by using the filterSettings-hierarchyMode property.

ej.treegrid.TreeGrid.Inject(ej.treegrid.Page, ej.treegrid.Sort, ej.grids.Filter);
var treeGridObj = new ej.treegrid.TreeGrid({
    dataSource: sampleData,
    childMapping: 'subtasks',
    treeColumnIndex: 1,
    allowFiltering: true,
    columns: [
                { field: 'taskID', headerText: 'Task ID', width: 90, textAlign: 'Right' },
                { field: 'taskName', headerText: 'Task Name', width: 180, textAlign: 'Left' },
                {
                    field: 'startDate', headerText: 'Start Date', width: 90, textAlign: 'Right', type: 'date', format: 'yMd' 
                },
                { field: 'duration', headerText: 'Duration', width: 80, textAlign: 'Right' }
    ],
    pageSettings: {pageSize: 11},
    allowPaging: true,
    allowSorting: true
});

treeGridObj.appendTo('#TreeGrid');
/**
 * TreeGrid DataSource
 */

window.sampleData =  [
    {
        taskID: 1,
        taskName: 'Planning',
        startDate: new Date('02/03/2017'),
        endDate: new Date('02/07/2017'),
        progress: 100,
        duration: 5,
        priority: 'Normal',
        approved: false,
        subtasks: [
            { taskID: 2, taskName: 'Plan timeline', startDate: new Date('02/03/2017'),
                endDate: new Date('02/07/2017'), duration: 5, progress: 100, priority: 'Normal', approved: false },
            { taskID: 3, taskName: 'Plan budget', startDate: new Date('02/03/2017'),
                endDate: new Date('02/07/2017'), duration: 5, progress: 100, priority: 'Low', approved: true },
            { taskID: 4, taskName: 'Allocate resources', startDate: new Date('02/03/2017'),
                endDate: new Date('02/07/2017'), duration: 5, progress: 100, priority: 'Critical', approved: false },
            { taskID: 5, taskName: 'Planning complete', startDate: new Date('02/07/2017'),
                endDate: new Date('02/07/2017'), duration: 0, progress: 0, priority: 'Low', approved: true }
        ]
    },
    {
        taskID: 6,
        taskName: 'Design',
        startDate: new Date('02/10/2017'),
        endDate: new Date('02/14/2017'),
        duration: 3,
        progress: 86,
        priority: 'High',
        approved: false,
        subtasks: [
            { taskID: 7, taskName: 'Software Specification', startDate: new Date('02/10/2017'),
                endDate: new Date('02/12/2017'), duration: 3, progress: 60, priority: 'Normal', approved: false },
            { taskID: 8, taskName: 'Develop prototype', startDate: new Date('02/10/2017'),
                endDate: new Date('02/12/2017'), duration: 3, progress: 100, priority: 'Critical', approved: false },
            { taskID: 9, taskName: 'Get approval from customer', startDate: new Date('02/13/2017'),
                endDate: new Date('02/14/2017'), duration: 2, progress: 100, priority: 'Low', approved: true },
            { taskID: 10, taskName: 'Design Documentation', startDate: new Date('02/13/2017'),
                endDate: new Date('02/14/2017'), duration: 2, progress: 100, priority: 'High', approved: true },
            { taskID: 11, taskName: 'Design complete', startDate: new Date('02/14/2017'),
                endDate: new Date('02/14/2017'), duration: 0, progress: 0, priority: 'Normal', approved: true }
        ]
    },
    {
        taskID: 12,
        taskName: 'Implementation Phase',
        startDate: new Date('02/17/2017'),
        endDate: new Date('02/27/2017'),
        priority: 'Normal',
        approved: false,
        duration: 11,
        progress: 66,
        subtasks: [
            {
                taskID: 13,
                taskName: 'Phase 1',
                startDate: new Date('02/17/2017'),
                endDate: new Date('02/27/2017'),
                priority: 'High',
                approved: false,
                progress: 50,
                duration: 11,
                subtasks: [{
                    taskID: 14,
                    taskName: 'Implementation Module 1',
                    startDate: new Date('02/17/2017'),
                    endDate: new Date('02/27/2017'),
                    priority: 'Normal',
                    duration: 11,
                    progress: 10,
                    approved: false,
                    subtasks: [
                        { taskID: 15, taskName: 'Development Task 1', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'High', approved: false },
                        { taskID: 16, taskName: 'Development Task 2', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'Low', approved: true },
                        { taskID: 17, taskName: 'Testing', startDate: new Date('02/20/2017'),
                            endDate: new Date('02/21/2017'), duration: 2, progress: '0', priority: 'Normal', approved: true },
                        { taskID: 18, taskName: 'Bug fix', startDate: new Date('02/24/2017'),
                            endDate: new Date('02/25/2017'), duration: 2, progress: '0', priority: 'Critical', approved: false },
                        { taskID: 19, taskName: 'Customer review meeting', startDate: new Date('02/26/2017'),
                            endDate: new Date('02/27/2017'), duration: 2, progress: '0', priority: 'High', approved: false },
                        { taskID: 20, taskName: 'Phase 1 complete', startDate: new Date('02/27/2017'),
                            endDate: new Date('02/27/2017'), duration: 0, progress: '50', priority: 'Low', approved: true }

                    ]
                }]
            },
            {
                taskID: 21,
                taskName: 'Phase 2',
                startDate: new Date('02/17/2017'),
                endDate: new Date('02/28/2017'),
                priority: 'High',
                approved: false,
                duration: 12,
                progress: 60,
                subtasks: [{
                    taskID: 22,
                    taskName: 'Implementation Module 2',
                    startDate: new Date('02/17/2017'),
                    endDate: new Date('02/28/2017'),
                    priority: 'Critical',
                    approved: false,
                    duration: 12,
                    progress: 90,
                    subtasks: [
                        { taskID: 23, taskName: 'Development Task 1', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/20/2017'), duration: 4, progress: '50', priority: 'Normal', approved: true },
                        { taskID: 24, taskName: 'Development Task 2', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/20/2017'), duration: 4, progress: '50', priority: 'Critical', approved: true },
                        { taskID: 25, taskName: 'Testing', startDate: new Date('02/21/2017'),
                            endDate: new Date('02/24/2017'), duration: 2, progress: '0', priority: 'High', approved: false },
                        { taskID: 26, taskName: 'Bug fix', startDate: new Date('02/25/2017'),
                            endDate: new Date('02/26/2017'), duration: 2, progress: '0', priority: 'Low', approved: false },
                        { taskID: 27, taskName: 'Customer review meeting', startDate: new Date('02/27/2017'),
                            endDate: new Date('02/28/2017'), duration: 2, progress: '0', priority: 'Critical', approved: true },
                        { taskID: 28, taskName: 'Phase 2 complete', startDate: new Date('02/28/2017'),
                            endDate: new Date('02/28/2017'), duration: 0, progress: '50', priority: 'Normal', approved: false }

                    ]
                }]
            },

            {
                taskID: 29,
                taskName: 'Phase 3',
                startDate: new Date('02/17/2017'),
                endDate: new Date('02/27/2017'),
                priority: 'Normal',
                approved: false,
                duration: 11,
                progress: 30,
                subtasks: [{
                    taskID: 30,
                    taskName: 'Implementation Module 3',
                    startDate: new Date('02/17/2017'),
                    endDate: new Date('02/27/2017'),
                    priority: 'High',
                    approved: false,
                    duration: 11,
                    progress: 60,
                    subtasks: [
                        { taskID: 31, taskName: 'Development Task 1', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'Low', approved: true },
                        { taskID: 32, taskName: 'Development Task 2', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'Normal', approved: false },
                        { taskID: 33, taskName: 'Testing', startDate: new Date('02/20/2017'),
                            endDate: new Date('02/21/2017'), duration: 2, progress: '0', priority: 'Critical', approved: true },
                        { taskID: 34, taskName: 'Bug fix', startDate: new Date('02/24/2017'),
                            endDate: new Date('02/25/2017'), duration: 2, progress: '0', priority: 'High', approved: false },
                        { taskID: 35, taskName: 'Customer review meeting', startDate: new Date('02/26/2017'),
                            endDate: new Date('02/27/2017'), duration: 2, progress: '0', priority: 'Normal', approved: true },
                        { taskID: 36, taskName: 'Phase 3 complete', startDate: new Date('02/27/2017'),
                            endDate: new Date('02/27/2017'), duration: 0, progress: '50', priority: 'Critical', approved: false },
                    ]
                }]
            }
        ]
    }
];

window.sortData = [
    {
        orderID: '1',
        orderName: 'Order 1',
        orderDate: new Date('02/03/2017'),
        shippedDate: new Date('02/09/2017'),
        units: '1395',
        unitPrice: '47',
        price: '133.66',
        Category: 'Products',
        subtasks: [
            { orderID: '1.1', orderName: 'Mackerel', Category: 'Frozen seafood', units: '235',
            orderDate: new Date('03/03/2017'), shippedDate: new Date('03/10/2017'), unitPrice: '12', price: '28.20' },
            { orderID: '1.2', orderName: 'Yellowfin Tuna', Category: 'Frozen seafood', units: '324',
            orderDate: new Date('04/05/2017'), shippedDate: new Date('04/12/2017'), unitPrice: '8', price: '25.92' },
            { orderID: '1.3', orderName: 'Herrings', Category: 'Frozen seafood', units: '488',
            orderDate: new Date('05/08/2017'), shippedDate: new Date('05/15/2017'), unitPrice: '11', price: '52.68' },
            { orderID: '1.4', orderName: 'Preserved Olives', Category: 'Edible', units: '125',
            orderDate: new Date('06/10/2017'), shippedDate: new Date('06/17/2017'), unitPrice: '9', price: '11.25' },
            { orderID: '1.5', orderName: 'Sweet corn Frozen', Category: 'Edible', units: '223',
            orderDate: new Date('07/12/2017'), shippedDate: new Date('07/19/2019'), unitPrice: '7', price: '15.61' }
         ]
    },
    {
        orderID: '2',
        orderName: 'Order 2',
        orderDate: new Date('01/10/2018'),
        shippedDate: new Date('01/16/2018'),
        units: '1944',
        unitPrice: '58',
        price: '212.33',
        Category:'SeaFood',
        subtasks: [
            { orderID: '2.1', orderName: 'Tilapias', Category: 'Frozen seafood',
            orderDate: new Date('02/05/2018'), shippedDate: new Date('02/12/2018'), units: '278', unitPrice: '15', price: '41.70' },
            { orderID: '2.2', orderName: 'White Shrimp', Category: 'Frozen seafood', units: '560',
            orderDate: new Date('05/22/2018'), shippedDate: new Date('05/29/2018'), unitPrice: '7', price: '39.20' },
            { orderID: '2.3', orderName: 'Fresh Cheese', Category: 'Dairy', units: '323', unitPrice: '12',
            orderDate: new Date('06/08/2018'), shippedDate: new Date('06/15/2018'), price: '38.76' },
            { orderID: '2.4', orderName: 'Blue Veined Cheese', Category: 'Dairy', units: '370', unitPrice: '15',
            orderDate: new Date('07/10/2018'), shippedDate: new Date('07/17/2018'), price: '55.50' },
            { orderID: '2.5', orderName: 'Butter', Category: 'Dairy', units: '413', unitPrice: '9',
            orderDate: new Date('09/18/2018'), shippedDate: new Date('09/25/2018'), price: '37.17' }
        ]
    },
    {
        orderID: '3',
        orderName: 'Order 3',
        orderDate: new Date('09/10/2018'),
        shippedDate: new Date('09/20/2018'),
        units: '1120',
        unitPrice: '33',
        price: '108.80',
        Category:'Crystals',
        subtasks: [
            { orderID: '3.1', orderName: 'Lead glassware', Category: 'Solid crystals',
            orderDate: new Date('02/07/2018'), shippedDate: new Date('02/14/2018'), units: '542', unitPrice: '6', price: '32.52' },
            { orderID: '3.2', orderName: 'Pharmaceutical Glassware', Category: 'Solid crystals',
            orderDate: new Date('04/19/2018'), shippedDate: new Date('04/26/2018'), units: '324', unitPrice: '11', price: '35.64' },
            { orderID: '3.3', orderName: 'Glass beads', Category: 'Solid crystals', units: '254',
            orderDate: new Date('05/22/2018'), shippedDate: new Date('03/22/2018'), unitPrice: '16', price: '40.64' }
        ]
    }

];
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Grid</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Grid Control">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-base/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-grids/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-treegrid/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-dropdowns/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-calendars/styles/material.css" rel="stylesheet">
    
    
    
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    
    
    
    
<script src="https://cdn.syncfusion.com/ej2/26.1.35/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <div id="TreeGrid"></div>        
    </div>

<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Run the application

Now, run the index.html in the web browser, it will render the Essential JS 2 TreeGrid control.

Output will be displayed as follows.

ej.treegrid.TreeGrid.Inject(ej.treegrid.Page, ej.treegrid.Sort, ej.grids.Filter);
var treeGridObj = new ej.treegrid.TreeGrid({
    dataSource: sampleData,
    childMapping: 'subtasks',
    treeColumnIndex: 1,
    allowFiltering: true,
    columns: [
                { field: 'taskID', headerText: 'Task ID', width: 90, textAlign: 'Right' },
                { field: 'taskName', headerText: 'Task Name', width: 180, textAlign: 'Left' },
                {
                    field: 'startDate', headerText: 'Start Date', width: 90, textAlign: 'Right', type: 'date', format: 'yMd' 
                },
                { field: 'duration', headerText: 'Duration', width: 80, textAlign: 'Right' }
    ],
    pageSettings: {pageSize: 11},
    allowPaging: true,
    allowSorting: true
});

treeGridObj.appendTo('#TreeGrid');
/**
 * TreeGrid DataSource
 */

window.sampleData =  [
    {
        taskID: 1,
        taskName: 'Planning',
        startDate: new Date('02/03/2017'),
        endDate: new Date('02/07/2017'),
        progress: 100,
        duration: 5,
        priority: 'Normal',
        approved: false,
        subtasks: [
            { taskID: 2, taskName: 'Plan timeline', startDate: new Date('02/03/2017'),
                endDate: new Date('02/07/2017'), duration: 5, progress: 100, priority: 'Normal', approved: false },
            { taskID: 3, taskName: 'Plan budget', startDate: new Date('02/03/2017'),
                endDate: new Date('02/07/2017'), duration: 5, progress: 100, priority: 'Low', approved: true },
            { taskID: 4, taskName: 'Allocate resources', startDate: new Date('02/03/2017'),
                endDate: new Date('02/07/2017'), duration: 5, progress: 100, priority: 'Critical', approved: false },
            { taskID: 5, taskName: 'Planning complete', startDate: new Date('02/07/2017'),
                endDate: new Date('02/07/2017'), duration: 0, progress: 0, priority: 'Low', approved: true }
        ]
    },
    {
        taskID: 6,
        taskName: 'Design',
        startDate: new Date('02/10/2017'),
        endDate: new Date('02/14/2017'),
        duration: 3,
        progress: 86,
        priority: 'High',
        approved: false,
        subtasks: [
            { taskID: 7, taskName: 'Software Specification', startDate: new Date('02/10/2017'),
                endDate: new Date('02/12/2017'), duration: 3, progress: 60, priority: 'Normal', approved: false },
            { taskID: 8, taskName: 'Develop prototype', startDate: new Date('02/10/2017'),
                endDate: new Date('02/12/2017'), duration: 3, progress: 100, priority: 'Critical', approved: false },
            { taskID: 9, taskName: 'Get approval from customer', startDate: new Date('02/13/2017'),
                endDate: new Date('02/14/2017'), duration: 2, progress: 100, priority: 'Low', approved: true },
            { taskID: 10, taskName: 'Design Documentation', startDate: new Date('02/13/2017'),
                endDate: new Date('02/14/2017'), duration: 2, progress: 100, priority: 'High', approved: true },
            { taskID: 11, taskName: 'Design complete', startDate: new Date('02/14/2017'),
                endDate: new Date('02/14/2017'), duration: 0, progress: 0, priority: 'Normal', approved: true }
        ]
    },
    {
        taskID: 12,
        taskName: 'Implementation Phase',
        startDate: new Date('02/17/2017'),
        endDate: new Date('02/27/2017'),
        priority: 'Normal',
        approved: false,
        duration: 11,
        progress: 66,
        subtasks: [
            {
                taskID: 13,
                taskName: 'Phase 1',
                startDate: new Date('02/17/2017'),
                endDate: new Date('02/27/2017'),
                priority: 'High',
                approved: false,
                progress: 50,
                duration: 11,
                subtasks: [{
                    taskID: 14,
                    taskName: 'Implementation Module 1',
                    startDate: new Date('02/17/2017'),
                    endDate: new Date('02/27/2017'),
                    priority: 'Normal',
                    duration: 11,
                    progress: 10,
                    approved: false,
                    subtasks: [
                        { taskID: 15, taskName: 'Development Task 1', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'High', approved: false },
                        { taskID: 16, taskName: 'Development Task 2', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'Low', approved: true },
                        { taskID: 17, taskName: 'Testing', startDate: new Date('02/20/2017'),
                            endDate: new Date('02/21/2017'), duration: 2, progress: '0', priority: 'Normal', approved: true },
                        { taskID: 18, taskName: 'Bug fix', startDate: new Date('02/24/2017'),
                            endDate: new Date('02/25/2017'), duration: 2, progress: '0', priority: 'Critical', approved: false },
                        { taskID: 19, taskName: 'Customer review meeting', startDate: new Date('02/26/2017'),
                            endDate: new Date('02/27/2017'), duration: 2, progress: '0', priority: 'High', approved: false },
                        { taskID: 20, taskName: 'Phase 1 complete', startDate: new Date('02/27/2017'),
                            endDate: new Date('02/27/2017'), duration: 0, progress: '50', priority: 'Low', approved: true }

                    ]
                }]
            },
            {
                taskID: 21,
                taskName: 'Phase 2',
                startDate: new Date('02/17/2017'),
                endDate: new Date('02/28/2017'),
                priority: 'High',
                approved: false,
                duration: 12,
                progress: 60,
                subtasks: [{
                    taskID: 22,
                    taskName: 'Implementation Module 2',
                    startDate: new Date('02/17/2017'),
                    endDate: new Date('02/28/2017'),
                    priority: 'Critical',
                    approved: false,
                    duration: 12,
                    progress: 90,
                    subtasks: [
                        { taskID: 23, taskName: 'Development Task 1', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/20/2017'), duration: 4, progress: '50', priority: 'Normal', approved: true },
                        { taskID: 24, taskName: 'Development Task 2', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/20/2017'), duration: 4, progress: '50', priority: 'Critical', approved: true },
                        { taskID: 25, taskName: 'Testing', startDate: new Date('02/21/2017'),
                            endDate: new Date('02/24/2017'), duration: 2, progress: '0', priority: 'High', approved: false },
                        { taskID: 26, taskName: 'Bug fix', startDate: new Date('02/25/2017'),
                            endDate: new Date('02/26/2017'), duration: 2, progress: '0', priority: 'Low', approved: false },
                        { taskID: 27, taskName: 'Customer review meeting', startDate: new Date('02/27/2017'),
                            endDate: new Date('02/28/2017'), duration: 2, progress: '0', priority: 'Critical', approved: true },
                        { taskID: 28, taskName: 'Phase 2 complete', startDate: new Date('02/28/2017'),
                            endDate: new Date('02/28/2017'), duration: 0, progress: '50', priority: 'Normal', approved: false }

                    ]
                }]
            },

            {
                taskID: 29,
                taskName: 'Phase 3',
                startDate: new Date('02/17/2017'),
                endDate: new Date('02/27/2017'),
                priority: 'Normal',
                approved: false,
                duration: 11,
                progress: 30,
                subtasks: [{
                    taskID: 30,
                    taskName: 'Implementation Module 3',
                    startDate: new Date('02/17/2017'),
                    endDate: new Date('02/27/2017'),
                    priority: 'High',
                    approved: false,
                    duration: 11,
                    progress: 60,
                    subtasks: [
                        { taskID: 31, taskName: 'Development Task 1', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'Low', approved: true },
                        { taskID: 32, taskName: 'Development Task 2', startDate: new Date('02/17/2017'),
                            endDate: new Date('02/19/2017'), duration: 3, progress: '50', priority: 'Normal', approved: false },
                        { taskID: 33, taskName: 'Testing', startDate: new Date('02/20/2017'),
                            endDate: new Date('02/21/2017'), duration: 2, progress: '0', priority: 'Critical', approved: true },
                        { taskID: 34, taskName: 'Bug fix', startDate: new Date('02/24/2017'),
                            endDate: new Date('02/25/2017'), duration: 2, progress: '0', priority: 'High', approved: false },
                        { taskID: 35, taskName: 'Customer review meeting', startDate: new Date('02/26/2017'),
                            endDate: new Date('02/27/2017'), duration: 2, progress: '0', priority: 'Normal', approved: true },
                        { taskID: 36, taskName: 'Phase 3 complete', startDate: new Date('02/27/2017'),
                            endDate: new Date('02/27/2017'), duration: 0, progress: '50', priority: 'Critical', approved: false },
                    ]
                }]
            }
        ]
    }
];

window.sortData = [
    {
        orderID: '1',
        orderName: 'Order 1',
        orderDate: new Date('02/03/2017'),
        shippedDate: new Date('02/09/2017'),
        units: '1395',
        unitPrice: '47',
        price: '133.66',
        Category: 'Products',
        subtasks: [
            { orderID: '1.1', orderName: 'Mackerel', Category: 'Frozen seafood', units: '235',
            orderDate: new Date('03/03/2017'), shippedDate: new Date('03/10/2017'), unitPrice: '12', price: '28.20' },
            { orderID: '1.2', orderName: 'Yellowfin Tuna', Category: 'Frozen seafood', units: '324',
            orderDate: new Date('04/05/2017'), shippedDate: new Date('04/12/2017'), unitPrice: '8', price: '25.92' },
            { orderID: '1.3', orderName: 'Herrings', Category: 'Frozen seafood', units: '488',
            orderDate: new Date('05/08/2017'), shippedDate: new Date('05/15/2017'), unitPrice: '11', price: '52.68' },
            { orderID: '1.4', orderName: 'Preserved Olives', Category: 'Edible', units: '125',
            orderDate: new Date('06/10/2017'), shippedDate: new Date('06/17/2017'), unitPrice: '9', price: '11.25' },
            { orderID: '1.5', orderName: 'Sweet corn Frozen', Category: 'Edible', units: '223',
            orderDate: new Date('07/12/2017'), shippedDate: new Date('07/19/2019'), unitPrice: '7', price: '15.61' }
         ]
    },
    {
        orderID: '2',
        orderName: 'Order 2',
        orderDate: new Date('01/10/2018'),
        shippedDate: new Date('01/16/2018'),
        units: '1944',
        unitPrice: '58',
        price: '212.33',
        Category:'SeaFood',
        subtasks: [
            { orderID: '2.1', orderName: 'Tilapias', Category: 'Frozen seafood',
            orderDate: new Date('02/05/2018'), shippedDate: new Date('02/12/2018'), units: '278', unitPrice: '15', price: '41.70' },
            { orderID: '2.2', orderName: 'White Shrimp', Category: 'Frozen seafood', units: '560',
            orderDate: new Date('05/22/2018'), shippedDate: new Date('05/29/2018'), unitPrice: '7', price: '39.20' },
            { orderID: '2.3', orderName: 'Fresh Cheese', Category: 'Dairy', units: '323', unitPrice: '12',
            orderDate: new Date('06/08/2018'), shippedDate: new Date('06/15/2018'), price: '38.76' },
            { orderID: '2.4', orderName: 'Blue Veined Cheese', Category: 'Dairy', units: '370', unitPrice: '15',
            orderDate: new Date('07/10/2018'), shippedDate: new Date('07/17/2018'), price: '55.50' },
            { orderID: '2.5', orderName: 'Butter', Category: 'Dairy', units: '413', unitPrice: '9',
            orderDate: new Date('09/18/2018'), shippedDate: new Date('09/25/2018'), price: '37.17' }
        ]
    },
    {
        orderID: '3',
        orderName: 'Order 3',
        orderDate: new Date('09/10/2018'),
        shippedDate: new Date('09/20/2018'),
        units: '1120',
        unitPrice: '33',
        price: '108.80',
        Category:'Crystals',
        subtasks: [
            { orderID: '3.1', orderName: 'Lead glassware', Category: 'Solid crystals',
            orderDate: new Date('02/07/2018'), shippedDate: new Date('02/14/2018'), units: '542', unitPrice: '6', price: '32.52' },
            { orderID: '3.2', orderName: 'Pharmaceutical Glassware', Category: 'Solid crystals',
            orderDate: new Date('04/19/2018'), shippedDate: new Date('04/26/2018'), units: '324', unitPrice: '11', price: '35.64' },
            { orderID: '3.3', orderName: 'Glass beads', Category: 'Solid crystals', units: '254',
            orderDate: new Date('05/22/2018'), shippedDate: new Date('03/22/2018'), unitPrice: '16', price: '40.64' }
        ]
    }

];
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Grid</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Grid Control">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-base/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-grids/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-treegrid/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-dropdowns/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-calendars/styles/material.css" rel="stylesheet">
    
    
    
    <link href="https://cdn.syncfusion.com/ej2/26.1.35/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    
    
    
    
<script src="https://cdn.syncfusion.com/ej2/26.1.35/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <div id="TreeGrid"></div>        
    </div>

<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Deploy the application

The Essential JS 2 TreeGrid control features are segregated into individual feature-wise modules. The Essential Studio JavaScript (Essential JS 2) build and CDN scripts contains code for all features used in the TreeGrid. So, do not to use the CDN scripts in production. It is strongly recommended to generate script files to use in production using our Custom Resource Generator(CRG) for Essential JS 2. CRG allows you to generate the bundled script for the currently enabled features in TreeGrid.

You can refer to our JavaScript Tree Grid feature tour page for its groundbreaking feature representations. You can also explore our JavaScript Tree Grid example JavaScript Tree Grid example to knows how to present and manipulate data.

Handling errors

Error handling in Tree Grid identifies exceptions and notifies them through the actionFailure event. When configuring the Tree Grid or enabling specific features through its API, mistakes can occur. The actionFailure event can be used to manage these errors. This event triggers when such mistakes happen. The actionFailure event handles various scenarios, including:

  • For CRUD operations, row drag and drop, and persisiting the selection, ensure the isPrimaryKey property is mapped to a unique data column. Failure to do so will cause an error.
  • Paging is not supported with virtualization. Enabling paging with virtualization will result in an error.
  • To render the Tree Grid, map either the dataSource or columns property. Failure to do so will result in an error.
  • Freeze columns by mapping either isFrozen or frozenColumns. Enabling both properties simultaneously will result in an error.
  • The detailTemplate is not supported with virtualization and stacked header. Enabling them with these features will result in an error.
  • The frozenRows and frozenColumns are not supported with rowtemplate, detailTemplate, and cell editing. Enabling them with these features will result in an error.
  • In stacked header, the freeze direction is incompatible with column reordering.
  • Selection functionality is not supported when using rowTemplate. Enabling both properties simultaneously will result in an error.
  • Set the treeColumnIndex value to display the tree structure. Make sure the value does not exceed the total column count, or it will result in an error.
  • For virtualization, do not specify height and width in percentages. Using percentages will result in an error.
  • When using the default filter (filterbar) type, do not apply the other filterType to columns within the same tree grid, as this will result in an error.
  • In Tree Grid, avoid enabling idMapping and childMapping simultaneously. Enabling both properties at the same time will result in an error.
  • The showCheckbox column should only be defined in the tree column. Defining it elsewhere will result in an error.
  • The textAlign right is not applicable for tree columns in the Tree Grid. Enabling right alignment for tree columns will result in an error.

The following code example shows how to use the actionFailure event in the Tree Grid control to display an exception when isPrimaryKey are not configured properly in the Tree Grid.

ej.treegrid.TreeGrid.Inject(ej.treegrid.Edit);

var treeGridObj = new ej.treegrid.TreeGrid({
    dataSource: sampleData,
    childMapping: 'subtasks',
    editSettings: { allowEditing: true, allowAdding: true, allowDeleting: true},
    treeColumnIndex: 1,
    columns: [
        { field: 'taskID', headerText: 'Task ID', width: 90, textAlign: 'Right'},
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