Accessibility in JavaScript Checkbox control

30 Mar 2023 / 2 minutes to read

The web accessibility makes web content and web applications more accessible for people with disabilities. It especially helps in dynamic content change and development of advanced user interface controls with AJAX, HTML, JavaScript, and related technologies. CheckBox provides built-in compliance with WAI-ARIA specifications. WAI-ARIA support is achieved through the attributes like aria-checked and aria-disabled. It helps the people with disabilities by providing information about the widget for assistive technology in the screen readers. CheckBox component contains the checkbox role.

Properties	Functionality
role	Indicates the type of input element.
aria-checked	Indicates whether the input is checked, unchecked, or represents mixture of checked and unchecked values.
aria-disabled	Indicates that the element is perceivable but disabled, so it is not editable or otherwise operable.

Keyboard interaction

Keyboard shortcuts	Actions
`Space`	When the checkbox has focus, pressing the Space key changes the state of the checkbox.

Source

Preview

app.ts

index.html

styles.css

import { CheckBox } from '@syncfusion/ej2-buttons';
import { enableRipple } from '@syncfusion/ej2-base';

enableRipple(true);

//checked state.
let checkbox: CheckBox = new CheckBox({ label: 'Checked State', checked: true });
checkbox.appendTo('#checkbox1');

//unchecked state.
checkbox = new CheckBox({ label: 'Unchecked State' });
checkbox.appendTo('#checkbox2');

//indeterminate state.
checkbox = new CheckBox({ label: 'Indeterminate State', indeterminate: true });
checkbox.appendTo('#checkbox3');

<!DOCTYPE html>
<html lang="en">

<head>
            
    <title>EJ2 CheckBox</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="//cdn.syncfusion.com/ej2/21.1.35/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="styles.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'>
        <ul>
            <li><input type="checkbox" id="checkbox1" /></li>
            <li><input type="checkbox" id="checkbox2" /></li>
            <li><input type="checkbox" id="checkbox3" /></li>
        </ul>
    </div>
</body>

</html>

#container {
    visibility: hidden;
}

#loader {
  color: #008cff;
  height: 40px;
  width: 30%;
  position: absolute;
  top: 45%;
  left: 45%;
}

.e-checkbox-wrapper {
  margin-top: 18px;
}

li {
  list-style: none;
}