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Accessibility in JavaScript (ES5) Mention control

08 Feb 2023 / 2 minutes to read

Web accessibility makes web content and web applications more accessible for people with disabilities. Mention control provides built-in compliance with WAI-ARIA specifications. The WAI-ARIA support is achieved using the attributes such as aria-selected and aria-activedescendent.

ARIA attributes

The Mention control uses the Listbox role where each list item has an option role. The following ARIA attributes denote the Mention state.

Properties Functionalities
aria-selected Indicates the selected option.
aria-activedescendent This attribute holds the ID of the active list item to focus its descendant child element.
aria-owns This attribute contains the ID of the popup list to indicate popup as a child element.

Keyboard interaction

You can use the following key shortcuts to access the Mention without interruptions.

Keyboard shortcuts Actions
Arrow Down Selects the first item in the Mention list. Otherwise, selects the item next to the currently selected item.
Arrow Up Selects the item previous to the currently selected one.
Esc(Escape) Closes the popup list when it is in an open state.
Enter Selects the focused item, and when it is in an open state the popup list closes.
Tab Focuses on the next TabIndex element on the page when the popup is closed. Otherwise, inserts the selected popup list item and closes the popup list.
Source
Preview
index.html
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<!DOCTYPE html><html lang="en"><head>
            
    <title>Essential JS 2 Mention</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript UI Controls">
    <meta name="author" content="Syncfusion">
    <link href="styles.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/20.4.48/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/20.4.48/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/20.4.48/ej2-dropdowns/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/20.4.48/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container" style="width:200px;">
        <label style="font-size: 15px; font-weight: 600;">Comments</label>
        <!--element which is the Mention target to list the suggestions-->
        <div id="mentionElement" style="min-height: 100px; border: 1px solid #D7D7D7; border-radius: 4px; padding: 8px; font-size: 14px; width: 600px;"></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>