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Accordion

Accordions contain creation flows and allow lightweight editing of an element.

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

Note: Accordions are no longer documented in the Material Design guidelines, but Material-UI will continue to support them. It was formerly known as the "expansion panel".

Simple accordion

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Controlled accordion

Extend the default behavior to create an accordion with the Accordion component.

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Customized accordions

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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Additional actions

In order to put an action such as a Checkbox or a button inside of the AccordionSummary, you need to stop the propagation of the focus and click events to prevent the accordion from expanding/collapsing when using the action. You should also provide an aria-label for the action, otherwise the label of the nested action will be included in the label of the parent button that controls the accordion expansion.

The click event of the nested action will propagate up and expand the accordion unless you explicitly stop it.

The focus event of the nested action will propagate up and also focus the accordion unless you explicitly stop it.

If you forget to put an aria-label on the nested action, the label of the action will also be included in the label of the parent button that controls the accordion expansion.

Performance

The content of Accordions is mounted by default even if the accordion is not expanded. This default behavior has server-side rendering and SEO in mind. If you render expensive component trees inside your accordion details or simply render many accordions it might be a good idea to change this default behavior by enabling the unmountOnExit in TransitionProps:

<Accordion 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 accordion to assist the user.

Location

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Accessibility

(WAI-ARIA: https://www.w3.org/TR/wai-aria-practices/#accordion)

For optimal accessibility we recommend setting id and aria-controls on the AccordionSummary. The Accordion will derive the necessary aria-labelledby and id for the content region of the accordion.