Integrate treeview inside the accordion in EJ2 TypeScript Accordion control

2 May 20235 minutes to read

Accordion supports to render other Essential JS 2 Components by using content property. You can give content as an element string like below, for initializing the component.

content: '<div id="element"> </div>'

The other component can be rendered with the use of provided events, such as clicked and expanding.

The following procedure is to render a TreeView within the Accordion,

Import the TreeView module from ej2-navigations, for adding TreeView. Please refer the TreeView initialization steps
You can initialize the TreeView component in expanding event, by getting the element and defining the required TreeView properties.

index.ts
index.html
import { Accordion, TreeView } from '@syncfusion/ej2-navigations';
import { DocDB, DownloadDB, PicDB} from 'datasource.ts'

  //Initialize Accordion component
    let acrdnObj: Accordion = new Accordion({
    expanding: expand,
    width: 400,
       items : [
           { header: 'Documents', expanded: true, content: '<div id="treeDoc"></div>' },
           { header: 'Downloads', content : '<div id="treeDownload"></div>' },
           { header: 'Pictures', content: '<div id="treePic"></div>' },
       ]
    });
    //Render initialized Accordion component
    acrdnObj.appendTo('#element');

    //Expanding Event function for Accordion component.
    function expand(e: ExpandEventArgs): void {
  if (e.name === 'expanding' && [].indexOf.call(this.items, e.item) === 0 && e.element.querySelector('#treeDoc').childElementCount === 0) {
    //Initialize TreeView component
        let treeObj: TreeView = new TreeView({
        fields: { dataSource: DocDB, id: 'nodeId', text: 'nodeText', child: 'nodeChild', iconCss: 'icon', imageUrl: 'image' },
        sortOrder: 'Ascending'
    });
    //Render initialized TreeView component
    treeObj.appendTo('#treeDoc');
  }
    if (e.name === 'expanding' && [].indexOf.call(this.items, e.item) === 1 && e.element.querySelector('#treeDownload').childElementCount === 0) {
        let treeObj: TreeView = new TreeView({
        fields: { dataSource: DownloadDB, id: 'nodeId', text: 'nodeText', child: 'nodeChild', iconCss: 'icon', imageUrl: 'image' },
        sortOrder: 'Ascending'
    });
    treeObj.appendTo('#treeDownload');
  }
      if (e.name === 'expanding' && [].indexOf.call(this.items, e.item) === 2 && e.element.querySelector('#treePic').childElementCount === 0) {
        let treeObj: TreeView = new TreeView({
        fields: { dataSource: PicDB, id: 'nodeId', text: 'nodeText', child: 'nodeChild', iconCss: 'icon', imageUrl: 'image' },
        sortOrder: 'Ascending'
    });
    treeObj.appendTo('#treePic');
  }
}
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 Accordion</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Toolbar Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/25.1.35/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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    <div id='loader'>LOADING....</div>
    <div id='container'>
        <div id='element'></div>
        <br/><br/>
        <div id='result'></div>
    </div>
</body>

</html>