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Set the nested Accordion in JavaScript Accordion control

Accordion supports to render nested level of Accordion by using content property. You can give nested Accordion content inside the parent Accordion content property by using id of nested element. The nested Accordion can be rendered with the use of provided events, such as clicked and expanding.

Source
Preview
index.ts
index.html
import { Accordion, AccordionClickArgs, ExpandEventArgs } from '@syncfusion/ej2-navigations';

let nestAcrdn_vid: Accordion;
let nestAcrdn_mus: Accordion;
let nestAcrdn_musNew: Accordion;
let nestAcrdn_img: Accordion;
let accordion: Accordion = new Accordion({
  expanding: expanding,
  items: [
    { header: 'Video', content: '<div id="nested_video"></div>' },
    { header: 'Music', content: '<div id="nested_music"></div>' },
    { header: 'Images', content: '<div id="nested_images"></div>' },
  ]
});
accordion.appendTo('#element');
function clicked(e: AccordionClickArgs): void {
  let ele: HTMLElement = e.originalEvent.target;
  if (ele.querySelectorAll('.e-accordion').length > 0) {
    return;
  }
  if (!document.getElementById("nested_musicNew").classList.contains("e-accordion")) {
  nestAcrdn_musNew = new Accordion({
    items: [
      { header: 'New Track1' },
      { header: 'New Track2' }
    ]
  }, '#nested_musicNew');
  }
}

function expanding(e: ExpandEventArgs): void {
  if (e.isExpanded && [].indexOf.call(this.items, e.item) === 0) {
    if (e.element.querySelectorAll('.e-accordion').length > 0) {
      return;
    }
  nestAcrdn_vid = new Accordion({
    items: [
      { header: 'Video Track1' },
      { header: 'Video Track2' }
    ]
  }, '#nested_video');
  }
  if (e.isExpanded && [].indexOf.call(this.items, e.item) === 1) {
    if (e.element.querySelectorAll('.e-accordion').length > 0) {
      return;
    }
    nestAcrdn_mus = new Accordion({
      clicked: clicked,
      items: [
        { header: 'Music Track1' },
        { header: 'Music Track2' },
        { header: 'Music New', content: '<div id="nested_musicNew"></div>' }
      ]
    }, '#nested_music');
  }
  if (e.isExpanded && [].indexOf.call(this.items, e.item) === 2) {
    if (e.element.querySelectorAll('.e-accordion').length > 0) {
      return;
    }
    nestAcrdn_img = new Accordion({
      items: [
        { header: 'Track1' },
        { header: 'Track2' },
      ]
    }, '#nested_images');
  }
}
<!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="//cdn.syncfusion.com/ej2/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='element'></div>
        <br/><br/>
        <div id='result'></div>
    </div>
</body>

</html>