accordion

Accessible accordion using CSS transition to expand and contract. Aria states are automatically added.

To get Started

CommonJS

$ npm install c2-accordion

var Accordion = require('c2-accordion');

Browser Global

<script src="https://code.jquery.com/jquery-3.0.0.min.js"></script>
<script src="iife/accordion.js"></script>

Basic Example

<div class="Accordion">
    <div class="item" data-status="disabled">
        <div class="target">...</div>
        <div class="panel">...</div>
    </div>
    <div class="item" data-status="disabled">
        <div class="target">...</div>
        <div class="panel">...</div>
    </div>
    <div class="item" data-status="disabled">
        <div class="target">...</div>
        <div class="panel">...</div>
    </div>
</div>

// This wouldn't be necessary since all these options are the defaults
var options = {
    item: '.item',
    target: '.target',
    control: '.target', // in this case the target is also acting as the control
    panel: '.panel',
    allowMultiple: true,
    attribute: 'data-status',
    expanded: 'expanded',
    contracted: 'contracted',
    prefix: 'Accordion-',
    transition: 'height .3s',
    transitionSupport: true,
    setFocus: 'none', // options: none, item, panel, target, control, first
    hashEnabled: false // use hash in URL to open accordion item
};

new Accordion('.Accordion', options);

Since the height of the "control" and the height of the "panel" make up the height of the item. It is sometimes not the case that the "target" is the same as the "control". Below is an example of this:

<div class="Accordion">
    <div class="item" data-status="disabled">
        <div class="control">
            <a class="target" href="#">...</a>
        </div>
        <div class="panel">...</div>
    </div>
    <div class="item" data-status="disabled">
        <div class="control">
            <a class="target" href="#">...</a>
        </div>
        <div class="panel">...</div>
    </div>
    <div class="item" data-status="disabled">
        <div class="control">
            <a class="target" href="#">...</a>
        </div>
        <div class="panel">...</div>
    </div>
</div>

new Accordion('.Accordion', {
    control: '.control'
});

Example with Hashes

Add the attribute "data-hash" to each item on the accordion.

<div class="Accordion">
    <div class="item" data-status="disabled" data-hash="Accordion1">
        <div class="target">...</div>
        <div class="panel">...</div>
    </div>
    <div class="item" data-status="disabled" data-hash="Accordion2">
        <div class="target">...</div>
        <div class="panel">...</div>
    </div>
    <div class="item" data-status="disabled" data-hash="Accordion3">
        <div class="target">...</div>
        <div class="panel">...</div>
    </div>
</div>

new Accordion('.Accordion', {
    hashEnabled: true
});

API

var accordion = new Accordion('.Accordion');

accordion.activate(0);    // toggles accordion to the index
accordion.expand(0);      // expands accordion to the index
accordion.contract(0);    // contracts accordion to the index
accordion.contractAll(0); // contracts all the accordions, the optional parameter is an index that gets ignored
accordion.destroy()       // removes event listeners and aria properties

Accessibility

http://www.w3.org/TR/wai-aria-practices/#accordion

Here is what the markup looks like after accessibility is added with JavaScript. It may be beneficial to add the aria attributes before JavaScript runs.

<div class="Accordion" role="tablist" aria-multiselectable="true">
    <div class="item" data-status="expanded">
        <div class="target" role="tab" aria-expanded="true" tabindex="0" id="Accordion-1-1">...</div>
        <div class="panel" role="tabpanel" aria-hidden="false" aria-labelledby="Accordion-1-1">...</div>
    </div>
    <div class="item" data-status="contracted">
        <div class="target" role="tab" aria-expanded="false" tabindex="0" id="Accordion-1-2">...</div>
        <div class="panel" role="tabpanel" aria-hidden="true" aria-labelledby="Accordion-1-2">...</div>
    </div>
    <div class="item" data-status="contracted">
        <div class="target" role="tab" aria-expanded="false" tabindex="0" id="Accordion-1-3">...</div>
        <div class="panel" role="tabpanel" aria-hidden="true" aria-labelledby="Accordion-1-3">...</div>
    </div>
</div>

Or if allowMultiple is set to false.

<div class="Accordion" role="tablist">
    <div class="item" data-status="expanded">
        <div class="target" role="tab" aria-expanded="true" aria-selected="true" tabindex="0" id="Accordion-2-1">...</div>
        <div class="panel" role="tabpanel" aria-hidden="false" aria-labelledby="Accordion-2-1">...</div>
    </div>
    <div class="item" data-status="contracted">
        <div class="target" role="tab" aria-expanded="false" aria-selected="false" tabindex="0" id="Accordion-2-2">...</div>
        <div class="panel" role="tabpanel" aria-hidden="true" aria-labelledby="Accordion-2-2">...</div>
    </div>
    <div class="item" data-status="contracted">
        <div class="target" role="tab" aria-expanded="false" aria-selected="false" tabindex="0" id="Accordion-2-3">...</div>
        <div class="panel" role="tabpanel" aria-hidden="true" aria-labelledby="Accordion-2-3">...</div>
    </div>
</div>

License

MIT © The C2 Group