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To keep single pane open always in JavaScript Accordion control

08 May 2023 / 2 minutes to read

By default, all Accordion panels are collapsible. You can customize the Accordion to keep one panel as expanded state always. This is applicable for Single expand mode.

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import {Accordion, ExpandEventArgs, AccordionClickArgs} from '@syncfusion/ej2-navigations';
import { enableRipple } from '@syncfusion/ej2-base';

let clickEle: HTMLElement;
let accordion: Accordion = new Accordion({
    expandMode: 'Single',
    clicked: clicked,
    expanding: beforeExpand,
    items: [
      { header: 'ASP.NET', expanded:'true', content: 'Microsoft ASP.NET is a set of technologies in the Microsoft .NET Framework for building Web applications and XML Web services.' },
      { header: 'ASP.NET MVC', content: 'The Model-View-Controller (MVC) architectural pattern separates an application into three main components: the model, the view, and the controller.' },
      { header: 'JavaScript', content: 'JavaScript (JS) is an interpreted computer programming language. It was originally implemented as part of web browsers so that client-side scripts could interact with the user, control the browser, communicate asynchronously, and alter the document content that was displayed.' },

function clicked (e: AccordionClickArgs): void {
  clickEle = ( as Element).closest('.e-acrdn-header');
function beforeExpand (e: ExpandEventArgs):void {
  let expandCount: number = this.element.querySelectorAll('.e-selected').length;
  let ele: HTMLElement= this.element.querySelectorAll('.e-selected')[0];
  if (ele) {
    ele = ele.firstChild as Element;
  if (expandCount === 1 && ele === clickEle) {
    e.cancel = true;
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<!DOCTYPE html>
<html lang="en">

    <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="//" rel="stylesheet" />
    <script src=""></script>
    <script src="systemjs.config.js"></script>

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