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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 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.

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

Example

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

.collapse hides content
.collapsing is applied during transitions
.collapse.show shows content

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

Link with href

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-toggle="collapse" href="#collapseExample" role="button" aria-expanded="false" aria-controls="collapseExample">
    Link with href
  </a>
  <button class="btn btn-primary" type="button" data-toggle="collapse" data-target="#collapseExample" aria-expanded="false" aria-controls="collapseExample">
    Button with data-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>

Horizontal

The collapse plugin also supports horizontal collapsing. Add the .width modifier class to transition the width instead of height and set a width on the immediate child element. Feel free to write your own custom Sass, use inline styles, or use our width utilities.

Please note that while the example below has a min-height set to avoid excessive repaints in our docs, this is not explicitly required. Only the width on the child element is required.

This is some placeholder content for a horizontal collapse. It's hidden by default and shown when triggered.

<p>
  <button class="btn btn-primary" type="button" data-toggle="collapse" data-target="#collapseWidthExample" aria-expanded="false" aria-controls="collapseWidthExample">
    Toggle width collapse
  </button>
</p>
<div style="min-height: 120px;">
  <div class="collapse width" id="collapseWidthExample">
    <div class="card card-body" style="width: 320px;">
      This is some placeholder content for a horizontal collapse. It's hidden by default and shown when triggered.
    </div>
  </div>
</div>

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

Toggle first element

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-toggle="collapse" href="#multiCollapseExample1" role="button" aria-expanded="false" aria-controls="multiCollapseExample1">Toggle first element</a>
  <button class="btn btn-primary" type="button" data-toggle="collapse" data-target="#multiCollapseExample2" aria-expanded="false" aria-controls="multiCollapseExample2">Toggle second element</button>
  <button class="btn btn-primary" type="button" data-toggle="collapse" data-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>

Accordion example

Using the 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.

Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.

Some placeholder content for the second accordion panel. This panel is hidden by default.

And lastly, the placeholder content for the third and final accordion panel. This panel is hidden by default.

<div class="accordion" id="accordionExample">
  <div class="card">
    <div class="card-header" id="headingOne">
      <h2 class="mb-0">
        <button class="btn btn-link btn-block text-left" type="button" data-toggle="collapse" data-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
          Collapsible Group Item #1
        </button>
      </h2>
    </div>
    <div id="collapseOne" class="collapse show" aria-labelledby="headingOne" data-parent="#accordionExample">
      <div class="card-body">
        Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the <code>.show</code> class.
      </div>
    </div>
  </div>
  <div class="card">
    <div class="card-header" id="headingTwo">
      <h2 class="mb-0">
        <button class="btn btn-link btn-block text-left collapsed" type="button" data-toggle="collapse" data-target="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
          Collapsible Group Item #2
        </button>
      </h2>
    </div>
    <div id="collapseTwo" class="collapse" aria-labelledby="headingTwo" data-parent="#accordionExample">
      <div class="card-body">
        Some placeholder content for the second accordion panel. This panel is hidden by default.
      </div>
    </div>
  </div>
  <div class="card">
    <div class="card-header" id="headingThree">
      <h2 class="mb-0">
        <button class="btn btn-link btn-block text-left collapsed" type="button" data-toggle="collapse" data-target="#collapseThree" aria-expanded="false" aria-controls="collapseThree">
          Collapsible Group Item #3
        </button>
      </h2>
    </div>
    <div id="collapseThree" class="collapse" aria-labelledby="headingThree" data-parent="#accordionExample">
      <div class="card-body">
        And lastly, the placeholder content for the third and final accordion panel. This panel is hidden by default.
      </div>
    </div>
  </div>
</div>

Sizes

You may use buttons’ sizes utilities to increase or decrease accordion size.

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 class="row">
  <div class="col-md-6">
    <div class="accordion" id="accordionExample-3">
      <div class="card">
        <div class="card-header" id="headingOne-3">
          <h2 class="mb-0">
            <button class="btn btn-link btn-sm text-left" type="button" data-toggle="collapse" data-target="#collapseOne-3" aria-expanded="true" aria-controls="collapseOne-3">
              Collapsible Group Item #1
            </button>
          </h2>
        </div>
        <div id="collapseOne-3" class="collapse show" aria-labelledby="headingOne-3" data-parent="#accordionExample-3">
          <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>
      </div>
      <div class="card">
        <div class="card-header" id="headingTwo-3">
          <h2 class="mb-0">
            <button class="btn btn-link btn-sm text-left collapsed" type="button" data-toggle="collapse" data-target="#collapseTwo-3" aria-expanded="false" aria-controls="collapseTwo-3">
              Collapsible Group Item #2
            </button>
          </h2>
        </div>
        <div id="collapseTwo-3" class="collapse" aria-labelledby="headingTwo-3" data-parent="#accordionExample-3">
          <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>
      </div>
      <div class="card">
        <div class="card-header" id="headingThree-3">
          <h2 class="mb-0">
            <button class="btn btn-link btn-sm text-left collapsed" type="button" data-toggle="collapse" data-target="#collapseThree-3" aria-expanded="false" aria-controls="collapseThree-3">
              Collapsible Group Item #3
            </button>
          </h2>
        </div>
        <div id="collapseThree-3" class="collapse" aria-labelledby="headingThree-3" data-parent="#accordionExample-3">
          <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>
      </div>
    </div>
  </div>
  <div class="col-md-6">
    <div class="accordion" id="accordionExample-4">
      <div class="card">
        <div class="card-header" id="headingOne-4">
          <h2 class="mb-0">
            <button class="btn btn-link btn-lg text-left" type="button" data-toggle="collapse" data-target="#collapseOne-4" aria-expanded="true" aria-controls="collapseOne-4">
              Collapsible Group Item #1
            </button>
          </h2>
        </div>
        <div id="collapseOne-4" class="collapse show" aria-labelledby="headingOne-4" data-parent="#accordionExample-4">
          <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>
      </div>
      <div class="card">
        <div class="card-header" id="headingTwo-4">
          <h2 class="mb-0">
            <button class="btn btn-link btn-lg text-left collapsed" type="button" data-toggle="collapse" data-target="#collapseTwo-4" aria-expanded="false" aria-controls="collapseTwo-4">
              Collapsible Group Item #2
            </button>
          </h2>
        </div>
        <div id="collapseTwo-4" class="collapse" aria-labelledby="headingTwo-4" data-parent="#accordionExample-4">
          <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>
      </div>
      <div class="card">
        <div class="card-header" id="headingThree-4">
          <h2 class="mb-0">
            <button class="btn btn-link btn-lg text-left collapsed" type="button" data-toggle="collapse" data-target="#collapseThree-4" aria-expanded="false" aria-controls="collapseThree-4">
              Collapsible Group Item #3
            </button>
          </h2>
        </div>
        <div id="collapseThree-4" class="collapse" aria-labelledby="headingThree-4" data-parent="#accordionExample-4">
          <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>
      </div>
    </div>
  </div>
</div>

Multiple openable

Simply add the .multi class on each panel to get multi openable accordions.

Collapsible Group Item #1

Collapsible Group Item #2

Collapsible Group Item #3

<div id="accordionExample-2" role="tablist" class="accordion">
  <div class="card multi">
    <div class="card-header" role="tab" id="headingOne-1">
      <h5 class="mb-0">
        <a data-toggle="collapse" data-parent="#accordionExample-2" href="#collapseOne-1" role="button" aria-expanded="true" aria-controls="collapseOne-1">
          Collapsible Group Item #1
        </a>
      </h5>
    </div>
    <div id="collapseOne-1" class="collapse show" role="tabpanel" aria-labelledby="headingOne-1">
      <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>
  </div>
  <div class="card multi">
    <div class="card-header" role="tab" id="headingTwo-1">
      <h5 class="mb-0">
        <a class="collapsed" data-toggle="collapse" data-parent="#accordionExample-2" href="#collapseTwo-1" role="button" aria-expanded="false" aria-controls="collapseTwo-1">
          Collapsible Group Item #2
        </a>
      </h5>
    </div>
    <div id="collapseTwo-1" class="collapse" role="tabpanel" aria-labelledby="headingTwo-1">
      <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>
  </div>
  <div class="card multi">
    <div class="card-header" role="tab" id="headingThree-1">
      <h5 class="mb-0">
        <a class="collapsed" data-toggle="collapse" data-parent="#accordionExample-2" href="#collapseThree-1" role="button" aria-expanded="false" aria-controls="collapseThree-1">
          Collapsible Group Item #3
        </a>
      </h5>
    </div>
    <div id="collapseThree-1" class="collapse" role="tabpanel" aria-labelledby="headingThree-1">
      <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>
  </div>
</div>

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 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 Boosted’s current implementation does not cover the various keyboard interactions described in the ARIA Authoring Practices Guide 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:

.collapse hides the content
.collapse.show shows the content
.collapsing is 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:

$('.collapse').collapse()

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

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.

`.collapse(options)`

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

$('#myCollapsible').collapse({
  toggle: false
})

`.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

Boosted’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).

$('#myCollapsible').on('hidden.bs.collapse', function () {
  // do something...
})