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';

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 classes 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. This 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 in 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 classes

These class names are useful for styling with CSS. They are applied to the component's slots when specific states are triggered.

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