vanilla-js-accordion

accordion
=========

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

To get Started
--------------

$3

``
$ npm install vanilla-js-accordion
`

`js
var Accordion = require('vanilla-js-accordion');
`

$3

`html

`


Basic Example
-------------

`html


`js
// 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',
setFocus: 'none', // options: none, item, panel, target, control, first
hashEnabled: true // 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". If you want an item to be open on page load, change the data-status to "expanded". Below is an example of this:

`html


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

Example with Custom IDs
-----------------------

Add an ID to each accordion target and an aria-labelledby attribute to each panel.

`html


`js
var accordion = new Accordion(document.querySelector('.Example1'));

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.expandAll(); // expands all the accordions
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.

`html


Or if allowMultiple is set to false.

`html


* After you pull down the project, run npm install to get all of the node modules
* You will want to work in the accordion.js file in the root
* To compile your changes, run npm run build (creates the CJS, IIFE and UMD versions of the module), then npm run bundle-example` (creates the example file)
* To test your changes, open example/index.html in a browser

License
-------

MIT © The C2 Group