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Load accordion items dynamically in JavaScript Accordion control

08 May 2023 / 2 minutes to read

Accordion items can be added dynamically by passing the item and index value with the addItem method.

In the following demo, new items are added dynamically when you expand an Accordion header using expanded event.

  • Data is fetched from the data source and it is formatted as a JSON object with header and content fields.
  • Here last index is calculated to append the new Accordion item at the end and the number of items are limited to 10, since the data bound have only 10 items.
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import { Accordion, ExpandEventArgs, AccordionClickArgs, AccordionItemModel } from '@syncfusion/ej2-navigations';
import { enableRipple } from '@syncfusion/ej2-base';
import { accordion } from './datasource.ts';


let dbFlag: number = 0;
let dynamciAcrdnCount: number = 2;
let acrdnObj: Accordion = new Accordion({
   expanded: expanded,
   items : [
       { header: 'ASP.NET', 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 Core ', content: ' ASP.NET Core is a free and open-source web framework, and the next generation of ASP.NET, developed by Microsoft and the community. It is a modular framework that runs on both the full .NET Framework, on Windows, and the cross-platform .NET Core.' },
       { 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.' },
function expanded( e: ExpandEventArgs) {
    //Find the expanded state item in accordion
    let Elementindex = document.getElementsByClassName("e-expand-state e-selected e-active")[0];
    //Check the expand state item and currently selected item index. If it is expanded state add dyanmic items or else does nothing
    if([] == [] {
      let array: AccordionItemModel[] = accordion as AccordionItemModel[];
      for(let i: number = 0 ; i < dynamciAcrdnCount; i++)
        if (dbFlag === array.length) { //checking whether all the items in data source added
            return; }
        // Item object and the index argument passed into the additem method to add a new accordion
        acrdnObj.addItem( array[dbFlag] , acrdnObj.items.length );
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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="" rel="stylesheet">
    <link href="//" rel="stylesheet" />
    <link href="index.css" rel="stylesheet" />
    <script src=""></script>
    <script src="systemjs.config.js"></script>

    <div id='loader'>LOADING....</div>
    <div id='container'>
        <div class="control-section">
            <div class="control_wrapper accordion-control-section">
                <div id="Accordion_default"></div>

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export let accordion: Object[] = [
        header:  ' ASP.NET Razor ',
        content: ' Razor is an ASP.NET programming syntax used to create dynamic web pages with the C# or Visual Basic .NET programming languages. Razor was in development in June 2010 and was released for Microsoft Visual Studio 2010 in January 2011. Razor is a simple-syntax view engine and was released as part of MVC 3 and the WebMatrix tool set. '
        header:  ' EmberJS ',
        content: ' EmberJS is an open-source JavaScript web framework, based on the Model–view–viewmodel (MVVM) pattern. It allows developers to create scalable single-page web applications by incorporating common idioms and best practices into the framework. '
        header:  ' Hypertext Markup Language ',
        content: ' Hypertext Markup Language (HTML) is the standard markup language for creating web pages and web applications. With Cascading Style Sheets (CSS) and JavaScript, it forms a triad of cornerstone technologies for the World Wide Web. '
        header:  ' HTML5 ',
        content: ' HTML5 is a markup language used for structuring and presenting content on the World Wide Web. It is the fifth and current major version of the HTML standard. '
        header:  ' JavaScript ',
        content: ' JavaScript (JS) is an interpreted computer programming language. '
        header:  ' JSP ',
        content: ' JavaServer Pages (JSP) is a technology that helps software developers create dynamically generated web pages based on HTML, XML, or other document types. Released in 1999 by Sun Microsystems, JSP is similar to PHP and ASP, but it uses the Java programming language. '
        header:  ' Perl ',
        content: ' Perl is a family of high-level, general-purpose, interpreted, dynamic programming languages.  Perl was originally developed by Larry Wall in 1987 as a general-purpose Unix scripting language to make report processing easier. '
        header:  ' PHP ',
        content: ' PHP is a server-side scripting language designed for web development but also used as a general-purpose programming language. Originally created by Rasmus Lerdorf in 1994, the PHP reference implementation is now produced by The PHP Group. PHP originally stood for Personal Home Page, but it now stands for the recursive acronym PHP: Hypertext Preprocessor '
        header:  ' Ruby ',
        content: ' Ruby is a dynamic, reflective, object-oriented, general-purpose programming language. It supports multiple programming paradigms, including functional, object-oriented, and imperative. It also has a dynamic type system and automatic memory management. '
        header:  ' Typescript ',
        content: ' TypeScript is an open-source programming language developed and maintained by Microsoft. It is a strict syntactical superset of JavaScript, and adds optional static typing to the language. '