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Accessibility in JavaScript (ES5) Accordion control

08 May 2023 / 3 minutes to read

The Accordion component has been designed keeping in mind the WAI-ARIA specifications, by applying the prompt WAI-ARIA roles, states, and properties along with the keyboard support. Thus, making it usable for people who use assistive WAI-ARIA Accessibility supports that is achieved through the attributes like aria-labelledby, It helps to provides information about the elements in a document for assistive technology. The component implements the keyboard navigation support by following the WAI-ARIA practices and tested in major screen readers.

ARIA attributes

Property Functionality
role Button: Attribute is set to the Accordion header elements to indicate that the element can be used to toggle the visibility of the associated content section, describing the actual role of the element.
Region: Attribute is set to the Accordion panel elements to create a landmark region that contains the currently expanded accordion panel, describing the actual role of the element.
aria-labelledby Attribute is set to content (panel) and it points to the corresponding Accordion header.
aria-controls Attribute is set to the header and it points to the corresponding Accordion content.
aria-expanded Attribute is set to the Accordion header elements to indicates the expand state of the Accordion Item. Default value of this attribute is false. If an item is expanded, the attribute value changes to ‘true’.
aria-hidden Attribute is set to the Accordion panel elements to indicates the content visible state of the Accordion Item. Default value of this attribute is true. If an item content is visible, the attribute value changes to false.
aria-disabled It indicates the disabled state of the Accordion and its items.

Keyboard interaction

Keyboard navigation is enabled by default. Possible keys are:

Key Description
Space or Enter When focus is on the Accordion header, click on the focused element makes the element to expand and collapse.
Down Arrow Focus the next Accordion header.
Up Arrow Focus the previous Accordion header.
Home Focus the first Accordion header.
End Focus the last Accordion header.
Source
Preview
index.js
index.html
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ej.base.enableRipple(true);

//Initialize Accordion component

var accordion = new ej.navigations.Accordion({
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 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.' },
    ]
});

//Render initialized Accordion component
accordion.appendTo('#element');
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<!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/ej2/21.2.3/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/21.2.3/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div id="element"></div>
        <br><br>
        <div id="result"></div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>