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Expansion Panels

Expansion panels contain creation flows and allow lightweight editing of an element.

An expansion panel is a lightweight container that may either stand alone or be connected to a larger surface, such as a card.

Note: Expansion panels are no longer documented in the Material Design guidelines, but Material-UI will continue to support them.

Accessibility

For optimal accessibility we recommend setting id and aria-controls on the ExpansionPanelSummary. The ExpansionPanel will derive the necessary aria-labelledby and id for the content region of the panel.

Simple Expansion Panel

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Controlled Accordion

Extend the default panel behavior to create an accordion with the ExpansionPanel component.

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Customized expansion panels

Here is an example of customizing the component. You can learn more about this in the overrides documentation page.

Collapsible Group Item #1

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Performance

The content of ExpansionPanels is mounted by default even if the panel is not expanded. This default behavior has server-side rendering and SEO in mind. If you render expensive component trees inside your panels or simply render many panels it might be a good idea to change this default behavior by enabling the unmountOnExit in TransitionProps: <ExpansionPanel TransitionProps={{ unmountOnExit: true }} />. As with any performance optimization this is not a silver bullet. Be sure to identify bottlenecks first and then try out these optimization strategies.

Secondary heading and Columns

Multiple columns can be used to structure the content, and a helper text may be added to the panel to assist the user.

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