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Infinite Scrolling in JavaScript TreeGrid control

29 Nov 2021 / 4 minutes to read

Infinite scrolling is used to load a huge amount of data without degrading the Tree Grid performance. This feature works like the lazy loading concept, which means the buffer data is loaded only when the scrollbar reaches the end of the scroller.

To use Infinite scrolling, set enableInfiniteScrolling property as true and inject the InfiniteScroll module in the treegrid.

  • In this feature, Tree Grid will not make a new data request when you visit the same page again.
Source
Preview
index.ts
index.css
index.html
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import { InfiniteScroll, TreeGrid } from '@syncfusion/ej2-treegrid';
import { virtualData, dataSource } from './datasource.ts';

TreeGrid.Inject(InfiniteScroll);

dataSource();

let treegrid: TreeGrid = new TreeGrid(
        {
            dataSource: virtualData,
            enableInfiniteScrolling: true,
            treeColumnIndex: 1,
            childMapping: 'Crew',
            pageSettings: { pageSize: 30 },
            height: 317,
            columns: [
                { field: 'TaskID', headerText: 'Player Jersey', width: 140, textAlign: 'Right' },
                { field: 'FIELD1', headerText: 'Player Name', width: 140 },
                { field: 'FIELD2', headerText: 'Year', width: 120, textAlign: 'Right' },
                { field: 'FIELD3', headerText: 'Stint', width: 120, textAlign: 'Right' },
                { field: 'FIELD4', headerText: 'TMID', width: 120, textAlign: 'Right' }
               ]
        });
    treegrid.appendTo('#TreeGrid');
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<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 TreeGrid</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript TreeGrid Control" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-grids/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-treegrid/styles/material.css" rel="stylesheet" />
    
    
    
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    
    
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>
<body>
        <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='TreeGrid'></div>
    </div>
</body>
</html>

InitialBlocks

You can define the initial loading pages count by using infiniteScrollSettings.initialBlocks property. By default, this feature loads three pages in initial rendering.

In the below demo, we have changed this property value to load five page records instead of three.

Source
Preview
index.ts
index.css
index.html
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import { InfiniteScroll, TreeGrid } from '@syncfusion/ej2-treegrid';
import { virtualData, dataSource } from './datasource.ts';

TreeGrid.Inject(InfiniteScroll);

dataSource();

let treegrid: TreeGrid = new TreeGrid(
        {
            dataSource: virtualData,
            enableInfiniteScrolling: true,
            infiniteScrollSettings: { initialBlocks: 5 },
            treeColumnIndex: 1,
            childMapping: 'Crew',
            pageSettings: { pageSize: 30 },
            height: 317,
            columns: [
                { field: 'TaskID', headerText: 'Player Jersey', width: 140, textAlign: 'Right' },
                { field: 'FIELD1', headerText: 'Player Name', width: 140 },
                { field: 'FIELD2', headerText: 'Year', width: 120, textAlign: 'Right' },
                { field: 'FIELD3', headerText: 'Stint', width: 120, textAlign: 'Right' },
                { field: 'FIELD4', headerText: 'TMID', width: 120, textAlign: 'Right' }
               ]
        });
    treegrid.appendTo('#TreeGrid');
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<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 TreeGrid</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript TreeGrid Control" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-grids/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-treegrid/styles/material.css" rel="stylesheet" />
    
    
    
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    
    
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>
<body>
        <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='TreeGrid'></div>
    </div>
</body>
</html>

Cache Mode

Cache is used to store the loaded rows object in the Tree Grid instance which can be reused for creating the row elements whenever you scroll to already visited page. Also, this mode maintains row elements based on the infiniteScrollSettings.maxBlocks count value, once this limit exceeds then it will remove row elements from DOM for new rows.

To enable the cache mode in Infinite scrolling, set infiniteScrollSettings.enableCache property as true.

Source
Preview
index.ts
index.css
index.html
Copied to clipboard
import { InfiniteScroll, TreeGrid } from '@syncfusion/ej2-treegrid';
import { virtualData, dataSource } from './datasource.ts';

TreeGrid.Inject(InfiniteScroll);

dataSource();

let treegrid: TreeGrid = new TreeGrid(
        {
            dataSource: virtualData,
            enableInfiniteScrolling: true,
            infiniteScrollSettings: { enableCache: true },
            treeColumnIndex: 1,
            childMapping: 'Crew',
            pageSettings: { pageSize: 30 },
            height: 317,
            columns: [
                { field: 'TaskID', headerText: 'Player Jersey', width: 140, textAlign: 'Right' },
                { field: 'FIELD1', headerText: 'Player Name', width: 140 },
                { field: 'FIELD2', headerText: 'Year', width: 120, textAlign: 'Right' },
                { field: 'FIELD3', headerText: 'Stint', width: 120, textAlign: 'Right' },
                { field: 'FIELD4', headerText: 'TMID', width: 120, textAlign: 'Right' }
               ]
        });
    treegrid.appendTo('#TreeGrid');
Copied to clipboard
Copied to clipboard
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 TreeGrid</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript TreeGrid Control" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-grids/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-treegrid/styles/material.css" rel="stylesheet" />
    
    
    
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    
    
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>
<body>
        <div id='loader'>Loading....</div>
    <div id='container'>
        <div id='TreeGrid'></div>
    </div>
</body>
</html>

Limitations for Infinite Scrolling

  • Due to the element height limitation in browsers, the maximum number of records loaded by the tree grid is limited due to the browser capability.
  • Initial loading rows total height must be greater than the viewport height.
  • Cell selection will not be persisted in cache mode.
  • Infinite scrolling is not compatible with batch editing, detail template and hierarchy features.
  • The aggregated information and total group items are displayed based on the current view items. To get these information regardless of the view items, refer to the
  • Programmatic selection using the selectRows and selectRow method is not supported in infinite scrolling.

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.