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Rich Tree View - Expansion

Handle how users can expand items.

Controlled expansion

Use the expandedItems prop to control the expanded items.

You can use the onExpandedItemsChange prop to listen to changes in the expanded items and update the prop accordingly.

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Track item expansion change

Use the onItemExpansionToggle prop if you want to react to an item expansion change:

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Imperative API

Change an item expansion

Use the setItemExpansion API method to change the expansion of an item.

apiRef.current.setItemExpansion(
  // The DOM event that triggered the change
  event,
  // The ID of the item to expand or collapse
  itemId,
  // `true` if the item should be expanded, `false` if it should be collapsed
  isExpanded,
);
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API

See the documentation below for a complete reference to all of the props and classes available to the components mentioned here.