Bootstrap 4 JS Collapse

Collapse CSS Classes

For a tutorial about Collapsibles, read our Bootstrap Collapse Tutorial.

Class	Description	Example
.collapse	Hides the content	Try it
.collapse show	Shows the collapsible content by default	Try it
.collapsing	Added when the transition starts, and removed when it finishes	Try it

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Via data-* Attributes

Just add data-toggle="collapse" and a data-target to element to automatically assign control of a collapsible element. 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".

Example

<button class="btn" data-toggle="collapse" data-target="#demo">Collapsible</button>

<div id="demo" class="collapse">
Some text..
</div>

Try it Yourself »

Tip: To add accordion-like group management to a collapsible control, add the data attribute data-parent="#selector".

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Via JavaScript

Enable manually with:

$('.collapse').collapse()

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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	Try it
parent	selector	false	All collapsible elements under the specified parent will be closed when this collapsible item is shown. (similar to traditional accordion behavior)	Try it
toggle	boolean	true	Toggles the collapsible element on invocation	Try it

Collapse Methods

The following table lists all available collapse methods.

Method	Description	Try it
.collapse(options)	Activates the collapsible element with an option. See options above for valid values
.collapse("toggle")	Toggles the collapsible element	Try it
.collapse("show")	Shows the collapsible element	Try it
.collapse("hide")	Hides the collapsible element	Try it
.collapse("dispose")	Destroys the collapsible element

Collapse Events

The following table lists all available collapse events.

Event	Description	Try it
show.bs.collapse	Occurs when the collapsible element is about to be shown	Try it
shown.bs.collapse	Occurs when the collapsible element is fully shown (after CSS transitions have completed)	Try it
hide.bs.collapse	Occurs when the collapsible element is about to be hidden	Try it
hidden.bs.collapse	Occurs when the collapsible element is fully hidden (after CSS transitions have completed)	Try it

Credit: www.w3schools.com