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Collapse API

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



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 of the Transition component are also available.


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.


The content node to be collapsed.


Override or extend the styles applied to the component.

See CSS classes API below for more details.

| string

The width (horizontal) or height (vertical) of the container when collapsed.

componentelement type-

The component used for the root node. Either a string to use a HTML element or a component.

easing{ enter?: string, exit?: string }
| string

The transition timing function. You may specify a single easing or a object containing enter and exit values.


If true, the component will transition in.

| 'vertical'

The transition orientation.

| 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.

| number
| { appear?: number, enter?: number, exit?: number }

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.


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 nameRule nameDescription
.MuiCollapse-enteredenteredStyles applied to the root element when the transition has entered.
.MuiCollapse-hiddenhiddenStyles applied to the root element when the transition has exited and collapsedSize = 0px.
.MuiCollapse-horizontalhorizontalState class applied to the root element if orientation="horizontal".
.MuiCollapse-rootrootStyles applied to the root element.
.MuiCollapse-wrapperwrapperStyles applied to the outer wrapper element.
.MuiCollapse-wrapperInnerwrapperInnerStyles applied to the inner wrapper element.

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