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collapse

Toggle the visibility of content across your project with a few classes and our JavaScript plugins.

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 heightfrom its current value to 0. Given how CSS handles animations, you cannot use paddingon a .collapseelement. Instead, use the class as an independent wrapping element.

The animation effect of this component is dependent on the prefers-reduced-motionmedia query. See the reduced motion section of our accessibility documentation .

example

Click the buttons below to show and hide another element via class changes:

  • .collapsehides content
  • .collapsingis applied during transitions
  • .collapse.showshow content

Generally, we recommend using a button with the data-bs-targetattribute. While not recommended from a semantic point of view, you can also use a link with the hrefattribute (and a role="button"). In both cases, the data-bs-toggle="collapse"is required.

Some placeholder content for the collapse component. This panel is hidden by default but revealed when the user activates the relevant trigger.
<p>
  <a class="btn btn-primary" data-bs-toggle="collapse" href="#collapseExample" role="button" aria-expanded="false" aria-controls="collapseExample">
    Link with href
  </a>
  <button class="btn btn-primary" type="button" data-bs-toggle="collapse" data-bs-target="#collapseExample" aria-expanded="false" aria-controls="collapseExample">
    Button with data-bs-target
  </button>
</p>
<div class="collapse" id="collapseExample">
  <div class="card card-body">
    Some placeholder content for the collapse component. This panel is hidden by default but revealed when the user activates the relevant trigger.
  </div>
</div>

multiple targets

A <button>or <a>can show and hide multiple elements by referencing them with a selector in its hrefor data-bs-targetattribute. Multiple <button>or <a>can show and hide an element if they each reference it with their hrefor data-bs-targetattribute

Some placeholder content for the first collapse component of this multi-collapse example. This panel is hidden by default but revealed when the user activates the relevant trigger.
Some placeholder content for the second collapse component of this multi-collapse example. This panel is hidden by default but revealed when the user activates the relevant trigger.
<p>
  <a class="btn btn-primary" data-bs-toggle="collapse" href="#multiCollapseExample1" role="button" aria-expanded="false" aria-controls="multiCollapseExample1">Toggle first element</a>
  <button class="btn btn-primary" type="button" data-bs-toggle="collapse" data-bs-target="#multiCollapseExample2" aria-expanded="false" aria-controls="multiCollapseExample2">Toggle second element</button>
  <button class="btn btn-primary" type="button" data-bs-toggle="collapse" data-bs-target=".multi-collapse" aria-expanded="false" aria-controls="multiCollapseExample1 multiCollapseExample2">Toggle both elements</button>
</p>
<div class="row">
  <div class="col">
    <div class="collapse multi-collapse" id="multiCollapseExample1">
      <div class="card card-body">
        Some placeholder content for the first collapse component of this multi-collapse example. This panel is hidden by default but revealed when the user activates the relevant trigger.
      </div>
    </div>
  </div>
  <div class="col">
    <div class="collapse multi-collapse" id="multiCollapseExample2">
      <div class="card card-body">
        Some placeholder content for the second collapse component of this multi-collapse example. This panel is hidden by default but revealed when the user activates the relevant trigger.
      </div>
    </div>
  </div>
</div>

accessibility

Be sure to add aria-expandedto 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 showclass, 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 (eg, an <a>or <div>), the attributerole="button"should be added to the element.

If your control element is targeting a single collapsible element – ​​ie the data-bs-targetattribute is pointing to an idselector – you should add the aria-controlsattribute to the control element, containing the idof 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 optional keyboard interactions described in the WAI-ARIA Authoring Practices 1.1 accordion pattern - you will need to include these yourself with custom JavaScript.

Sass

Variables

$transition-collapse:         height .35s ease;

classes

Collapse transition classes can be found in scss/_transitions.scssas these are shared across multiple components (collapse and accordion).

.collapse {
  &:not(.show) {
    display: none;
  }
}

.collapsing {
  height: 0;
  overflow: hidden;
  @include transition($transition-collapse);
}

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-bs-toggle="collapse"and a data-bs-targetto the element to automatically assign control of one or more collapsible elements. The data-bs-targetattribute accepts a CSS selector to apply the collapse to. Be sure to add the class collapseto 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-bs-parent="#selector". Refer to the demo to see this in action.

Via JavaScript

Enable manually with:

var collapseElementList = [].slice.call(document.querySelectorAll('.collapse'))
var collapseList = collapseElementList.map(function (collapseEl) {
  return new bootstrap.Collapse(collapseEl)
})

Options

Options can be passed via data attributes or JavaScript. For data attributes, append the option name to data-bs-, as in data-bs-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 cardclass). The attribute has to be set on the target collapsible area.
toggle boolean true Toggles the collapsible element on invocation

methods

Asynchronous methods and transitions

All API methods are asynchronous and start a transition . They return to the caller as soon as the transition is started but before it ends . In addition, a method call on a transitioning component will be ignored .

See our JavaScript documentation for more information .

Activates your content as a collapsible element. Accepts an optional options object.

You can create a collapse instance with the constructor, for example:

var myCollapse = document.getElementById('myCollapse')
var bsCollapse = new bootstrap.Collapse(myCollapse, {
  toggle: false
})
method Description
toggle Toggles a collapsible element to shown or hidden. Returns to the caller before the collapsible element has actually been shown or hidden (ie before the shown.bs.collapseor hidden.bs.collapseevent occurs).
show Shows a collapsible element. Returns to the caller before the collapsible element has actually been shown (eg, before the shown.bs.collapseevent occurs).
hide Hides a collapsible element. Returns to the caller before the collapsible element has actually been hidden (eg, before the hidden.bs.collapseevent occurs).
dispose Destroys an element's collapse. (Removes stored data on the DOM element)
getInstance Static method which allows you to get the collapse instance associated with a DOM element, you can use it like this:bootstrap.Collapse.getInstance(element)
getOrCreateInstance Static method which returns a collapse instance associated to a DOM element or create a new one in case it wasn't initialised. You can use it like this:bootstrap.Collapse.getOrCreateInstance(element)

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 showinstance 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 hidemethod 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).
var myCollapsible = document.getElementById('myCollapsible')
myCollapsible.addEventListener('hidden.bs.collapse', function () {
  // do something...
})