The API documentation of the ExpansionPanel React component.


Name Type Default Description
childrenĀ * 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.
CollapseProps object Properties applied to the Collapse element.
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.

function(event: object, expanded: boolean) => void
event: The event source of the callback
expanded: The expanded state of the panel

Any other properties supplied will be spread to the root element (Paper).


You can override all the class names injected by Material-UI thanks to the classes property. This property accepts the following keys:

Name Description
root Styles applied to the root element.
expanded Styles applied to the root element if expanded={true}.
disabled Styles applied to the root element if disabled={true}.

Have a look at overriding with classes section and the implementation of the component for more detail.

If using the overrides key of the theme as documented here, you need to use the following style sheet name: MuiExpansionPanel.


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