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Sakļaut

Pārslēdziet sava projekta satura redzamību, izmantojot dažas klases un mūsu JavaScript spraudņus.

Kā tas strādā

Sakļautais JavaScript spraudnis tiek izmantots, lai parādītu un paslēptu saturu. Pogas vai enkuri tiek izmantoti kā aktivizētāji, kas ir saistīti ar konkrētiem elementiem, kurus pārslēdzat. Sakļaujot elementu, heighttā pašreizējā vērtība tiks animēta uz 0. Ņemot vērā to, kā CSS apstrādā animācijas, to nevar izmantot paddingelementam .collapse. Tā vietā izmantojiet klasi kā neatkarīgu iesaiņojuma elementu.

Šī komponenta animācijas efekts ir atkarīgs no prefers-reduced-motionmultivides vaicājuma. Skatiet mūsu pieejamības dokumentācijas sadaļu samazinātas kustības .

Piemērs

Noklikšķiniet uz tālāk esošajām pogām, lai parādītu un paslēptu citu elementu, veicot klases izmaiņas:

  • .collapseslēpj saturu
  • .collapsingtiek izmantots pāreju laikā
  • .collapse.showparāda saturu

Parasti mēs iesakām izmantot pogu ar data-bs-targetatribūtu. Lai gan no semantiskā viedokļa tas nav ieteicams, varat izmantot arī saiti ar hrefatribūtu (un role="button"). Abos gadījumos data-bs-toggle="collapse"ir nepieciešams.

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>

Horizontāli

Sakļaušanas spraudnis atbalsta arī horizontālo sabrukšanu. Pievienojiet .collapse-horizontalmodifikatora klasi, lai pārietu uz widthtā vietā, heightun iestatiet a widthtiešajam bērna elementam. Jūtieties brīvi rakstīt savu pielāgoto Sass, izmantojiet iekļautos stilus vai izmantojiet mūsu platuma utilītas .

Lūdzu, ņemiet vērā, ka, lai gan tālāk norādītajā piemērā ir min-heightnoteikts, lai mūsu dokumentos izvairītos no pārmērīgas pārkrāsošanas, tas nav tieši pieprasīts. Ir nepieciešams tikai widthelements on the child.

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-bs-toggle="collapse" data-bs-target="#collapseWidthExample" aria-expanded="false" aria-controls="collapseWidthExample">
    Toggle width collapse
  </button>
</p>
<div style="min-height: 120px;">
  <div class="collapse collapse-horizontal" id="collapseWidthExample">
    <div class="card card-body" style="width: 300px;">
      This is some placeholder content for a horizontal collapse. It's hidden by default and shown when triggered.
    </div>
  </div>
</div>

Vairāki mērķi

A <button>vai <a>var parādīt un paslēpt vairākus elementus, atsaucoties uz tiem ar atlasītāju savā hrefvai data-bs-targetatribūtā. Vairāki <button>vai <a>var parādīt un paslēpt elementu, ja katrs uz to atsaucas ar savu hrefvai data-bs-targetatribūtu

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>

Pieejamība

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-bs-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 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;
$transition-collapse-width:   width .35s ease;

Classes

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

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

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

  &.collapse-horizontal {
    width: 0;
    height: auto;
    @include transition($transition-collapse-width);
  }
}

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-bs-toggle="collapse" and a data-bs-target to the element to automatically assign control of one or more collapsible elements. The data-bs-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-bs-parent="#selector". Refer to the accordion page for more information.

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 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.

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 (i.e. before the shown.bs.collapse or hidden.bs.collapse event occurs).
show Shows a collapsible element. Returns to the caller before the collapsible element has actually been shown (e.g., before the shown.bs.collapse event occurs).
hide Hides a collapsible element. Returns to the caller before the collapsible element has actually been hidden (e.g., before the hidden.bs.collapse event 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 to 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 initialized. 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 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).
var myCollapsible = document.getElementById('myCollapsible')
myCollapsible.addEventListener('hidden.bs.collapse', function () {
  // do something...
})