Collapse API

API reference docs for the React Collapse component. Learn about the props, CSS, and other APIs of this exported module.

Demos

For examples and details on the usage of this React component, visit the component demo pages:

Import

import Collapse from '@mui/material/Collapse';
// or
import { Collapse } from '@mui/material';

You can learn about the difference by reading this guide on minimizing bundle size.

The Collapse transition is used by the Vertical Stepper StepContent component. It uses react-transition-group internally.

Props

Props of the Transition component are also available.

Name	Type	Default	Description
addEndListener	func		Add a custom transition end trigger. Called with the transitioning DOM node and a done callback. Allows for more fine grained transition end logic. Note: Timeouts are still used as a fallback if provided.
children	node		The content node to be collapsed.
classes	object		Override or extend the styles applied to the component. See CSS API below for more details.
collapsedSize	number \| string	'0px'	The width (horizontal) or height (vertical) of the container when collapsed.
component	element type		The component used for the root node. Either a string to use a HTML element or a component. ⚠️ Needs to be able to hold a ref.
easing	{ enter?: string, exit?: string } \| string		The transition timing function. You may specify a single easing or a object containing enter and exit values.
in	bool		If `true`, the component will transition in.
orientation	'horizontal' \| 'vertical'	'vertical'	The transition orientation.
sx	Array<func \| object \| bool> \| func \| object		The system prop that allows defining system overrides as well as additional CSS styles. See the `sx` page for more details.
timeout	'auto' \| number \| { appear?: number, enter?: number, exit?: number }	duration.standard	The duration for the transition, in milliseconds. You may specify a single timeout for all transitions, or individually with an object. Set to 'auto' to automatically calculate transition time based on height.

The ref is forwarded to the root element.

Inheritance

While not explicitly documented above, the props of the Transition component from react-transition-group are also available on Collapse. You can take advantage of this to target nested components.

Theme default props

You can use MuiCollapse to change the default props of this component with the theme.

CSS

The following class names are useful for styling with CSS (the state classes are marked).
To learn more, visit the component customization page.

Rule name	Global class	Description
root	.MuiCollapse-root	Styles applied to the root element.
horizontal	.MuiCollapse-horizontal	State class applied to the root element if `orientation="horizontal"`.
entered	.MuiCollapse-entered	Styles applied to the root element when the transition has entered.
hidden	.MuiCollapse-hidden	Styles applied to the root element when the transition has exited and `collapsedSize` = 0px.
wrapper	.MuiCollapse-wrapper	Styles applied to the outer wrapper element.
wrapperInner	.MuiCollapse-wrapperInner	Styles applied to the inner wrapper element.

You can override the style of the component using one of these customization options:

With a global class name.
With a rule name as part of the component's styleOverrides property in a custom theme.