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| layout | title | description | group | toc |
|---|---|---|---|---|
| docs | Collapse | Toggle the visibility of content across your project with a few classes and our JavaScript plugins. | components | true |
How it works
The collapse JavaScript plugin is used to show and hide content. Buttons or anchors are used as triggers that are mapped to specific elements you toggle. Collapsing an element will animate the height from its current value to 0. Given how CSS handles animations, you cannot use padding on a .collapse element. Instead, use the class as an independent wrapping element.
{% include callout-info-prefersreducedmotion.md %}
Example
Click the buttons below to show and hide another element via class changes:
.collapsehides content.collapsingis applied during transitions.collapse.showshows content
You can use a link with the href attribute, or a button with the data-target attribute. In both cases, the data-toggle="collapse" is required.
{% capture example %}
Link with href Button with data-target
Multiple targets
A <button> or <a> can show and hide multiple elements by referencing them with a JQuery selector in its href or data-target attribute.
Multiple <button> or <a> can show and hide an element if they each reference it with their href or data-target attribute
{% capture example %}
Toggle first element Toggle second element Toggle both elements
Accordion example
Using the [card]({{ site.baseurl }}/docs/{{ site.docs_version }}/components/card/) component, you can extend the default collapse behavior to create an accordion. To properly achieve the accordion style, be sure to use .accordion as a wrapper.
{% capture example %}
Collapsible Group Item #1
<div id="collapseOne" class="collapse show" aria-labelledby="headingOne" data-parent="#accordionExample">
<div class="card-body">
Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
</div>
</div>
Collapsible Group Item #2
Collapsible Group Item #3
Accessibility
Be sure to add aria-expanded to the control element. This attribute explicitly conveys the current state of the collapsible element tied to the control to screen readers and similar assistive technologies. If the collapsible element is closed by default, the attribute on the control element should have a value of aria-expanded="false". If you've set the collapsible element to be open by default using the show class, set aria-expanded="true" on the control instead. The plugin will automatically toggle this attribute on the control based on whether or not the collapsible element has been opened or closed (via JavaScript, or because the user triggered another control element also tied to the same collapsible element). If the control element's HTML element is not a button (e.g., an <a> or <div>), the attribute role="button" should be added to the element.
If your control element is targeting a single collapsible element – i.e. the data-target attribute is pointing to an id selector – you should add the aria-controls attribute to the control element, containing the id of the collapsible element. Modern screen readers and similar assistive technologies make use of this attribute to provide users with additional shortcuts to navigate directly to the collapsible element itself.
Note that Bootstrap's current implementation does not cover the various keyboard interactions described in the WAI-ARIA Authoring Practices 1.1 accordion pattern - you will need to include these yourself with custom JavaScript.
Usage
The collapse plugin utilizes a few classes to handle the heavy lifting:
.collapsehides the content.collapse.showshows the content.collapsingis added when the transition starts, and removed when it finishes
These classes can be found in _transitions.scss.
Via data attributes
Just add data-toggle="collapse" and a data-target to the element to automatically assign control of one or more collapsible elements. The data-target attribute accepts a CSS selector to apply the collapse to. Be sure to add the class collapse to the collapsible element. If you'd like it to default open, add the additional class show.
To add accordion-like group management to a collapsible area, add the data attribute data-parent="#selector". Refer to the demo to see this in action.
Via JavaScript
Enable manually with:
{% highlight js %} $('.collapse').collapse() {% endhighlight %}
Options
Options can be passed via data attributes or JavaScript. For data attributes, append the option name to data-, as in data-parent="".
| Name | Type | Default | Description |
|---|---|---|---|
| parent | selector | jQuery object | DOM element | false | If parent is provided, then all collapsible elements under the specified parent will be closed when this collapsible item is shown. (similar to traditional accordion behavior - this is dependent on the card class). The attribute has to be set on the target collapsible area. |
| toggle | boolean | true | Toggles the collapsible element on invocation |
Methods
{% include callout-danger-async-methods.md %}
.collapse(options)
Activates your content as a collapsible element. Accepts an optional options object.
{% highlight js %} $('#myCollapsible').collapse({ toggle: false }) {% endhighlight %}
.collapse('toggle')
Toggles a collapsible element to shown or hidden. Returns to the caller before the collapsible element has actually been shown or hidden (i.e. before the shown.bs.collapse or hidden.bs.collapse event occurs).
.collapse('show')
Shows a collapsible element. Returns to the caller before the collapsible element has actually been shown (i.e. before the shown.bs.collapse event occurs).
.collapse('hide')
Hides a collapsible element. Returns to the caller before the collapsible element has actually been hidden (i.e. before the hidden.bs.collapse event occurs).
.collapse('dispose')
Destroys an element's collapse.
Events
Bootstrap's collapse class exposes a few events for hooking into collapse functionality.
| Event Type | Description |
|---|---|
| show.bs.collapse | This event fires immediately when the show instance method is called. |
| shown.bs.collapse | This event is fired when a collapse element has been made visible to the user (will wait for CSS transitions to complete). |
| hide.bs.collapse | This event is fired immediately when the hide method has been called. |
| hidden.bs.collapse | This event is fired when a collapse element has been hidden from the user (will wait for CSS transitions to complete). |
{% highlight js %} $('#myCollapsible').on('hidden.bs.collapse', function () { // do something... }) {% endhighlight %}