README

aria-collapsible

A lightweight, dependency-free JavaScript module for generating progressively-enhanced collapsible regions using ARIA States and Properties.

Key Features

Uses ARIA States and Properties
Dependency-free
AMD/CommonJS module support

aria-collapsible is also really tiny:

Uncompressed	1,942 bytes
Minified	1,254 bytes
Minified and gzipped	597 bytes

Getting aria-collapsible

Adding aria-collapsible to your project is easy! You've got a couple options:

Download a tagged version from GitHub and do it yourself (old school).
Install via Bower: bower install aria-collapsible
Install via npm: npm install aria-collapsible

Usage

HTML

To use aria-collapsible, your markup needs two elements: a control and a region. The control, typically a <button> or an <a> element, is what your user will interact with and is the element that controls the display of the collapsible region. The region is an element elsewhere on the page whose display is handled by the control.

The two elements are associated by adding an aria-controls="region" attribute to the control. The value of the aria-controls attribute corresponds to the value of the region's id attribute.

<button type="button" aria-controls="region" aria-expanded="true" aria-hidden id="control">Menu</button>

<nav id="region">
    <ul>
        <li><a href="#">Chapter 1</a></li>
        <li><a href="#">Chapter 2</a></li>
        <li><a href="#">Chapter 3</a></li>
        <li><a href="#">Chapter 4</a></li>
        <li><a href="#">Chapter 5</a></li>
    </ul>
</nav>

CSS

Most browsers don't natively hide elements with the aria-hidden attribute so you'll need to add the following to your stylesheet:

[aria-hidden] {
    display: none !important;
}

JavaScript

Lastly, initialize aria-collapsible by creating a new Collapsible, passing in a DOM reference to the control, and calling the init() method.

var collapsible = new Collapsible(document.getElementById('control'));

collapsible.init();

You can see the above in action in the included example file.

Collapsible regions can be shown and hidden programatically using the toggle() method:

collapsible.toggle();

You can also teardown a collapsible region, resetting the DOM to its initial state and removing event handlers:

collapsible.teardown();

Browser Support

aria-collapsible works in all modern browsers.

It makes use of the addEventListener method which first appeared in Internet Explorer in version 9.0. To avoid throwing JavaScript errors in browsers that don't support this method, you can cut the mustard:

if ('addEventListener' in window) {
    // Your scripts here…
}

Acknowledgments

aria-collapsible is inspired by the following works:

Steve Faulkner's article, HTML5 Accessibility Chops: hidden and aria-hidden
Heydon Pickering's Progressive collapsibles demo
Nicolas Hoffman's jQuery collapsible regions plugin

Special thanks to Jeremy Fields for his help testing with VoiceOver.

aria-collapsible is written and maintained by Jason Garber with the help of some great contributors.

License

aria-collapsible is freely available under The MIT License. Go forth and make the Web a more accessible place.

Usage no npm install needed!