ExpansionPanel API

The API documentation of the ExpansionPanel React component. Learn more about the props and the CSS customization points.

Import

import ExpansionPanel from '@material-ui/core/ExpansionPanel';
// or
import { ExpansionPanel } from '@material-ui/core';

You can learn more about the difference by reading this guide.

⚠️ The ExpansionPanel component was renamed to Accordion to use a more common naming convention.

You should use import { Accordion } from '@material-ui/core' or import Accordion from '@material-ui/core/Accordion'.

Component name

The MuiExpansionPanel name can be used for providing default props or style overrides at the theme level.

Props

Name	Type	Default	Description
children*	node		The content of the expansion panel.
classes	object		Override or extend the styles applied to the component. See CSS API below for more details.
defaultExpanded	bool	false	If true, expands the panel by default.
disabled	bool	false	If true, the panel will be displayed in a disabled state.
expanded	bool		If true, expands the panel, otherwise collapse it. Setting this prop enables control over the panel.
onChange	func		Callback fired when the expand/collapse state is changed. Signature: function(event: object, expanded: boolean) => void event: The event source of the callback. expanded: The expanded state of the panel.
square	bool	false	If true, rounded corners are disabled.
TransitionComponent	elementType	Collapse	The component used for the collapse effect. Follow this guide to learn more about the requirements for this component.
TransitionProps	object		Props applied to the Transition element.

The ref is forwarded to the root element.

Any other props supplied will be provided to the root element (Paper).

CSS

Rule name	Global class	Description
root	.MuiExpansionPanel-root	Styles applied to the root element.
rounded	.MuiExpansionPanel-rounded	Styles applied to the root element if square={false}.
expanded	.Mui-expanded	Styles applied to the root element if expanded={true}.
disabled	.Mui-disabled	Styles applied to the root element if disabled={true}.

You can override the style of the component thanks to one of these customization points:

• With a rule name of the classes object prop.
• With a global class name.
• With a theme and an overrides property.

If that's not sufficient, you can check the implementation of the component for more detail.

Inheritance

The props of the Paper component are also available. You can take advantage of this behavior to target nested components.