useMenuTrigger

Provides the behavior and accessibility implementation for a menu trigger.

install	`yarn add @react-aria/menu`
version	3.1.3
usage	`import {useMenuTrigger} from '@react-aria/menu'`

View ARIA spec

W3C

API#

useMenuTrigger(
  props: MenuTriggerAriaProps,
  state: MenuTriggerState,
  ref: RefObject<HTMLElement>
): MenuTriggerAria

Features#

There is no native element to implement a menu in HTML that is widely supported. useMenuTrigger combined with useMenu helps achieve accessible menu components that can be styled as needed.

Exposed to assistive technology as a button with a menu popup using ARIA (combined with useMenu)
Support for mouse, touch, and keyboard interactions
Keyboard support for opening the menu using the arrow keys, including automatically focusing the first or last item accordingly

Anatomy#

A menu trigger consists of a button or other trigger element combined with a popup menu. It should be combined with useButton and useMenu, which handle the implementation of the button and popup menu respectively.

useMenuTrigger returns props that you should spread onto the appropriate element:

Name	Type	Description
`menuTriggerProps`	`AriaButtonProps`	Props for the menu trigger element.
`menuProps`	`HTMLAttributes<HTMLElement>`	Props for the menu.

State is managed by the useMenuTriggerState hook from @react-stately/menu. The state object should be passed as an option to useMenuTrigger.

Example#

This example shows how to build a menu button using useMenuTrigger, useButton, and useMenu.

The menu popup uses useMenu and useMenuItem to render the menu and its items. In addition, a <FocusScope> is used to automatically restore focus to the trigger when the menu closes. A hidden <DismissButton> is added at the start and end of the menu to allow screen reader users to dismiss it easily.

This example does not do any advanced popover positioning or portaling to escape its visual container. See useOverlayTrigger for an example of how to implement this using useOverlayPosition.

In addition, see useMenu for examples of menu item groups, and more complex item content.

import {useMenuTriggerState} from '@react-stately/menu';
import {useButton} from '@react-aria/button';
import {useMenu, useMenuItem} from '@react-aria/menu';
import {useTreeState} from '@react-stately/tree';
import {Item} from '@react-stately/collections';
import {mergeProps} from '@react-aria/utils';
import {FocusScope} from '@react-aria/focus';
import {useFocus} from '@react-aria/interactions';
import {useOverlay, DismissButton} from '@react-aria/overlays';

function MenuButton(props) {
  // Create state based on the incoming props
  let state = useMenuTriggerState(props);

  // Get props for the menu trigger and menu elements
  let ref = React.useRef();
  let {menuTriggerProps, menuProps} = useMenuTrigger({}, state, ref);

  // Get props for the button based on the trigger props from useMenuTrigger
  let {buttonProps} = useButton(menuTriggerProps, ref);

  return (
    <div style={{position: 'relative', display: 'inline-block'}}>
      <button {...buttonProps} ref={ref} style={{height: 30, fontSize: 14}}>
        {props.label}
        <span aria-hidden="true" style={{paddingLeft: 5}}>
          ▼
        </span>
      </button>
      {state.isOpen && (
        <MenuPopup
          {...props}
          domProps={menuProps}
          autoFocus={state.focusStrategy}
          onClose={() => state.close()}
        />
      )}
    </div>
  );
}

function MenuPopup(props) {
  // Create menu state based on the incoming props
  let state = useTreeState({...props, selectionMode: 'none'});

  // Get props for the menu element
  let ref = React.useRef();
  let {menuProps} = useMenu(props, state, ref);

  // Handle events that should cause the menu to close,
  // e.g. blur, clicking outside, or pressing the escape key.
  let overlayRef = React.useRef();
  let {overlayProps} = useOverlay(
    {
      onClose: props.onClose,
      shouldCloseOnBlur: true,
      isOpen: true,
      isDismissable: true
    },
    overlayRef
  );

  // Wrap in <FocusScope> so that focus is restored back to the
  // trigger when the menu is closed. In addition, add hidden
  // <DismissButton> components at the start and end of the list
  // to allow screen reader users to dismiss the popup easily.
  return (
    <FocusScope restoreFocus>
      <div {...overlayProps} ref={overlayRef}>
        <DismissButton onDismiss={props.onClose} />
        <ul
          {...mergeProps(menuProps, props.domProps)}
          ref={ref}
          style={{
            position: 'absolute',
            width: '100%',
            margin: '4px 0 0 0',
            padding: 0,
            listStyle: 'none',
            border: '1px solid gray',
            background: 'lightgray'
          }}>
          {[...state.collection].map((item) => (
            <MenuItem
              key={item.key}
              item={item}
              state={state}
              onAction={props.onAction}
              onClose={props.onClose}
            />
          ))}
        </ul>
        <DismissButton onDismiss={props.onClose} />
      </div>
    </FocusScope>
  );
}

function MenuItem({item, state, onAction, onClose}) {
  // Get props for the menu item element
  let ref = React.useRef();
  let {menuItemProps} = useMenuItem(
    {
      key: item.key,
      isDisabled: item.isDisabled,
      onAction,
      onClose
    },
    state,
    ref
  );

  // Handle focus events so we can apply highlighted
  // style to the focused menu item
  let [isFocused, setFocused] = React.useState(false);
  let {focusProps} = useFocus({onFocusChange: setFocused});

  return (
    <li
      {...mergeProps(menuItemProps, focusProps)}
      ref={ref}
      style={{
        background: isFocused ? 'gray' : 'transparent',
        color: isFocused ? 'white' : 'black',
        padding: '2px 5px',
        outline: 'none',
        cursor: 'pointer'
      }}>
      {item.rendered}
    </li>
  );
}

<MenuButton label="Actions" onAction={alert}>
  <Item key="copy">Copy</Item>
  <Item key="cut">Cut</Item>
  <Item key="paste">Paste</Item>
</MenuButton>

import {useMenuTriggerState} from '@react-stately/menu';
import {useButton} from '@react-aria/button';
import {useMenu, useMenuItem} from '@react-aria/menu';
import {useTreeState} from '@react-stately/tree';
import {Item} from '@react-stately/collections';
import {mergeProps} from '@react-aria/utils';
import {FocusScope} from '@react-aria/focus';
import {useFocus} from '@react-aria/interactions';
import {
  useOverlay,
  DismissButton
} from '@react-aria/overlays';

function MenuButton(props) {
  // Create state based on the incoming props
  let state = useMenuTriggerState(props);

  // Get props for the menu trigger and menu elements
  let ref = React.useRef();
  let {menuTriggerProps, menuProps} = useMenuTrigger(
    {},
    state,
    ref
  );

  // Get props for the button based on the trigger props from useMenuTrigger
  let {buttonProps} = useButton(menuTriggerProps, ref);

  return (
    <div
      style={{
        position: 'relative',
        display: 'inline-block'
      }}>
      <button
        {...buttonProps}
        ref={ref}
        style={{height: 30, fontSize: 14}}>
        {props.label}
        <span aria-hidden="true" style={{paddingLeft: 5}}>
          ▼
        </span>
      </button>
      {state.isOpen && (
        <MenuPopup
          {...props}
          domProps={menuProps}
          autoFocus={state.focusStrategy}
          onClose={() => state.close()}
        />
      )}
    </div>
  );
}

function MenuPopup(props) {
  // Create menu state based on the incoming props
  let state = useTreeState({
    ...props,
    selectionMode: 'none'
  });

  // Get props for the menu element
  let ref = React.useRef();
  let {menuProps} = useMenu(props, state, ref);

  // Handle events that should cause the menu to close,
  // e.g. blur, clicking outside, or pressing the escape key.
  let overlayRef = React.useRef();
  let {overlayProps} = useOverlay(
    {
      onClose: props.onClose,
      shouldCloseOnBlur: true,
      isOpen: true,
      isDismissable: true
    },
    overlayRef
  );

  // Wrap in <FocusScope> so that focus is restored back to the
  // trigger when the menu is closed. In addition, add hidden
  // <DismissButton> components at the start and end of the list
  // to allow screen reader users to dismiss the popup easily.
  return (
    <FocusScope restoreFocus>
      <div {...overlayProps} ref={overlayRef}>
        <DismissButton onDismiss={props.onClose} />
        <ul
          {...mergeProps(menuProps, props.domProps)}
          ref={ref}
          style={{
            position: 'absolute',
            width: '100%',
            margin: '4px 0 0 0',
            padding: 0,
            listStyle: 'none',
            border: '1px solid gray',
            background: 'lightgray'
          }}>
          {[...state.collection].map((item) => (
            <MenuItem
              key={item.key}
              item={item}
              state={state}
              onAction={props.onAction}
              onClose={props.onClose}
            />
          ))}
        </ul>
        <DismissButton onDismiss={props.onClose} />
      </div>
    </FocusScope>
  );
}

function MenuItem({item, state, onAction, onClose}) {
  // Get props for the menu item element
  let ref = React.useRef();
  let {menuItemProps} = useMenuItem(
    {
      key: item.key,
      isDisabled: item.isDisabled,
      onAction,
      onClose
    },
    state,
    ref
  );

  // Handle focus events so we can apply highlighted
  // style to the focused menu item
  let [isFocused, setFocused] = React.useState(false);
  let {focusProps} = useFocus({onFocusChange: setFocused});

  return (
    <li
      {...mergeProps(menuItemProps, focusProps)}
      ref={ref}
      style={{
        background: isFocused ? 'gray' : 'transparent',
        color: isFocused ? 'white' : 'black',
        padding: '2px 5px',
        outline: 'none',
        cursor: 'pointer'
      }}>
      {item.rendered}
    </li>
  );
}

<MenuButton label="Actions" onAction={alert}>
  <Item key="copy">Copy</Item>
  <Item key="cut">Cut</Item>
  <Item key="paste">Paste</Item>
</MenuButton>

import {useMenuTriggerState} from '@react-stately/menu';
import {useButton} from '@react-aria/button';
import {
  useMenu,
  useMenuItem
} from '@react-aria/menu';
import {useTreeState} from '@react-stately/tree';
import {Item} from '@react-stately/collections';
import {mergeProps} from '@react-aria/utils';
import {FocusScope} from '@react-aria/focus';
import {useFocus} from '@react-aria/interactions';
import {
  useOverlay,
  DismissButton
} from '@react-aria/overlays';

function MenuButton(
  props
) {
  // Create state based on the incoming props
  let state = useMenuTriggerState(
    props
  );

  // Get props for the menu trigger and menu elements
  let ref = React.useRef();
  let {
    menuTriggerProps,
    menuProps
  } = useMenuTrigger(
    {},
    state,
    ref
  );

  // Get props for the button based on the trigger props from useMenuTrigger
  let {
    buttonProps
  } = useButton(
    menuTriggerProps,
    ref
  );

  return (
    <div
      style={{
        position:
          'relative',
        display:
          'inline-block'
      }}>
      <button
        {...buttonProps}
        ref={ref}
        style={{
          height: 30,
          fontSize: 14
        }}>
        {props.label}
        <span
          aria-hidden="true"
          style={{
            paddingLeft: 5
          }}>
          ▼
        </span>
      </button>
      {state.isOpen && (
        <MenuPopup
          {...props}
          domProps={
            menuProps
          }
          autoFocus={
            state.focusStrategy
          }
          onClose={() =>
            state.close()
          }
        />
      )}
    </div>
  );
}

function MenuPopup(
  props
) {
  // Create menu state based on the incoming props
  let state = useTreeState(
    {
      ...props,
      selectionMode:
        'none'
    }
  );

  // Get props for the menu element
  let ref = React.useRef();
  let {
    menuProps
  } = useMenu(
    props,
    state,
    ref
  );

  // Handle events that should cause the menu to close,
  // e.g. blur, clicking outside, or pressing the escape key.
  let overlayRef = React.useRef();
  let {
    overlayProps
  } = useOverlay(
    {
      onClose:
        props.onClose,
      shouldCloseOnBlur: true,
      isOpen: true,
      isDismissable: true
    },
    overlayRef
  );

  // Wrap in <FocusScope> so that focus is restored back to the
  // trigger when the menu is closed. In addition, add hidden
  // <DismissButton> components at the start and end of the list
  // to allow screen reader users to dismiss the popup easily.
  return (
    <FocusScope
      restoreFocus>
      <div
        {...overlayProps}
        ref={overlayRef}>
        <DismissButton
          onDismiss={
            props.onClose
          }
        />
        <ul
          {...mergeProps(
            menuProps,
            props.domProps
          )}
          ref={ref}
          style={{
            position:
              'absolute',
            width:
              '100%',
            margin:
              '4px 0 0 0',
            padding: 0,
            listStyle:
              'none',
            border:
              '1px solid gray',
            background:
              'lightgray'
          }}>
          {[
            ...state.collection
          ].map(
            (item) => (
              <MenuItem
                key={
                  item.key
                }
                item={
                  item
                }
                state={
                  state
                }
                onAction={
                  props.onAction
                }
                onClose={
                  props.onClose
                }
              />
            )
          )}
        </ul>
        <DismissButton
          onDismiss={
            props.onClose
          }
        />
      </div>
    </FocusScope>
  );
}

function MenuItem({
  item,
  state,
  onAction,
  onClose
}) {
  // Get props for the menu item element
  let ref = React.useRef();
  let {
    menuItemProps
  } = useMenuItem(
    {
      key: item.key,
      isDisabled:
        item.isDisabled,
      onAction,
      onClose
    },
    state,
    ref
  );

  // Handle focus events so we can apply highlighted
  // style to the focused menu item
  let [
    isFocused,
    setFocused
  ] = React.useState(
    false
  );
  let {
    focusProps
  } = useFocus({
    onFocusChange: setFocused
  });

  return (
    <li
      {...mergeProps(
        menuItemProps,
        focusProps
      )}
      ref={ref}
      style={{
        background: isFocused
          ? 'gray'
          : 'transparent',
        color: isFocused
          ? 'white'
          : 'black',
        padding:
          '2px 5px',
        outline: 'none',
        cursor: 'pointer'
      }}>
      {item.rendered}
    </li>
  );
}

<MenuButton
  label="Actions"
  onAction={alert}>
  <Item key="copy">
    Copy
  </Item>
  <Item key="cut">
    Cut
  </Item>
  <Item key="paste">
    Paste
  </Item>
</MenuButton>

Internationalization#

RTL#

In right-to-left languages, the menu button should be mirrored. The arrow should be on the left, and the label should be on the right. In addition, the content of menu items should flip. Ensure that your CSS accounts for this.

Name	Type	Description
`type`	`'menu' \| 'listbox'`	The type of menu that the menu trigger opens.

Properties

Name	Type	Description
`focusStrategy`	`FocusStrategy`	Controls which item will be auto focused when the menu opens.
`isOpen`	`boolean`	Whether the overlay is currently open.

Methods

Method	Description
`open( (focusStrategy: FocusStrategy \| \| null )): void`	Opens the menu.
`toggle( (focusStrategy: FocusStrategy \| \| null )): void`	Toggles the menu.
`close(): void`	Closes the overlay.

'first' | 'last'

Name	Type	Description
`menuTriggerProps`	`AriaButtonProps`	Props for the menu trigger element.
`menuProps`	`HTMLAttributes<HTMLElement>`	Props for the menu.

Name	Type	Default	Description
`isDisabled`	`boolean`	—	Whether the button is disabled.
`children`	`ReactNode`	—	The content to display in the button.
`onPress`	`( (e: PressEvent )) => void`	—	Handler that is called when the press is released over the target.
`onPressStart`	`( (e: PressEvent )) => void`	—	Handler that is called when a press interaction starts.
`onPressEnd`	`( (e: PressEvent )) => void`	—	Handler that is called when a press interaction ends, either over the target or when the pointer leaves the target.
`onPressChange`	`( (isPressed: boolean )) => void`	—	Handler that is called when the press state changes.
`onPressUp`	`( (e: PressEvent )) => void`	—	Handler that is called when a press is released over the target, regardless of whether it started on the target or not.
`autoFocus`	`boolean`	—	Whether the element should receive focus on render.
`onFocus`	`( (e: FocusEvent )) => void`	—	Handler that is called when the element receives focus.
`onBlur`	`( (e: FocusEvent )) => void`	—	Handler that is called when the element loses focus.
`onFocusChange`	`( (isFocused: boolean )) => void`	—	Handler that is called when the element's focus status changes.
`onKeyDown`	`( (e: KeyboardEvent )) => void`	—	Handler that is called when a key is pressed.
`onKeyUp`	`( (e: KeyboardEvent )) => void`	—	Handler that is called when a key is released.
`href`	`string`	—	A URL to link to if elementType="a".
`target`	`string`	—	The target window for the link.
`rel`	`string`	—	The relationship between the linked resource and the current page. See MDN.
`elementType`	`T \| JSXElementConstructor<any>`	`'button'`	The HTML element or React element used to render the button, e.g. 'div', 'a', or `RouterLink`.
`aria-expanded`	`boolean`	—	Indicates whether the element, or another grouping element it controls, is currently expanded or collapsed.
`aria-haspopup`	`boolean \| 'menu' \| 'listbox' \| 'tree' \| 'grid' \| 'dialog'`	—	Indicates the availability and type of interactive popup element, such as menu or dialog, that can be triggered by an element.
`aria-controls`	`string`	—	Identifies the element (or elements) whose contents or presence are controlled by the current element.
`aria-pressed`	`boolean`	—	Indicates the current "pressed" state of toggle buttons.
`type`	`'button' \| 'submit' \| 'reset'`	`'button'`	The behavior of the button when used in an HTML form.
`excludeFromTabOrder`	`boolean`	—	Whether to exclude the element from the sequential tab order. If true, the element will not be focusable via the keyboard by tabbing. This should be avoided except in rare scenarios where an alternative means of accessing the element or its functionality via the keyboard is available.
`id`	`string`	—	The element's unique identifier. See MDN.
`aria-label`	`string`	—	Defines a string value that labels the current element.
`aria-labelledby`	`string`	—	Identifies the element (or elements) that labels the current element.
`aria-describedby`	`string`	—	Identifies the element (or elements) that describes the object.
`aria-details`	`string`	—	Identifies the element (or elements) that provide a detailed, extended description for the object.

Name	Type	Description
`type`	`'pressstart' \| 'pressend' \| 'pressup' \| 'press'`	The type of press event being fired.
`pointerType`	`PointerType`	The pointer type that triggered the press event.
`target`	`HTMLElement`	The target element of the press event.
`shiftKey`	`boolean`	Whether the shift keyboard modifier was held during the press event.
`ctrlKey`	`boolean`	Whether the ctrl keyboard modifier was held during the press event.
`metaKey`	`boolean`	Whether the meta keyboard modifier was held during the press event.

'mouse'
  | 'pen'
  | 'touch'
  | 'keyboard'
  | 'virtual'

BaseEvent<ReactKeyboardEvent<any>>

T & {stopPropagation: () => void,
continuePropagation: () => void
}

Manages state for a menu trigger. Tracks whether the menu is currently open, and controls which item will receive focus when it opens.

useMenuTriggerState(
  (props: MenuTriggerProps
)): MenuTriggerState

Name	Type	Default	Description
`align`	`Alignment`	`'start'`	Alignment of the menu relative to the trigger.
`direction`	`'bottom' \| 'top'`	`'bottom'`	Where the Menu opens relative to its trigger.
`closeOnSelect`	`boolean`	`true`	Whether the Menu closes when a selection is made.
`shouldFlip`	`boolean`	`true`	Whether the menu should automatically flip direction when space is limited.
`isOpen`	`boolean`	—	Whether the overlay is open by default (controlled).
`defaultOpen`	`boolean`	—	Whether the overlay is open by default (uncontrolled).
`onOpenChange`	`( (isOpen: boolean )) => void`	—	Handler that is called when the overlay's open state changes.

'start' | 'end'

Provides the behavior and accessibility implementation for a menu trigger.

useMenuTrigger(
  props: MenuTriggerAriaProps,
  state: MenuTriggerState,
  ref: RefObject<HTMLElement>
): MenuTriggerAria

Provides the behavior and accessibility implementation for a button component. Handles mouse, keyboard, and touch interactions, focus behavior, and ARIA props for both native button elements and custom element types.

useButton(
  (props: AriaButtonProps<ElementType>,
  , ref: RefObject<any>
)): ButtonAria<HTMLAttributes<any>>

Name	Type	Description
`buttonProps`	`T`	Props for the button element.
`isPressed`	`boolean`	Whether the button is currently pressed.

Provides the behavior and accessibility implementation for a menu component. A menu displays a list of actions or options that a user can choose.

useMenu<T>(
  props: AriaMenuOptions<T>,
  state: TreeState<T>,
  ref: RefObject<HTMLElement>
): MenuAria

Name	Type	Description
`children`	`CollectionChildren<T>`	The contents of the collection.
`isVirtualized`	`boolean`	Whether the menu uses virtual scrolling.
`keyboardDelegate`	`KeyboardDelegate`	An optional keyboard delegate implementation for type to select, to override the default.
`autoFocus`	`boolean \| FocusStrategy`	Where the focus should be set.
`shouldFocusWrap`	`boolean`	Whether keyboard navigation is circular.
`onAction`	`( (key: Key )) => void`	Handler that is called when an item is selected.
`items`	`Iterable<T>`	Item objects in the collection.
`disabledKeys`	`Iterable<Key>`	The item keys that are disabled. These items cannot be selected, focused, or otherwise interacted with.
`selectionMode`	`SelectionMode`	The type of selection that is allowed in the collection.
`disallowEmptySelection`	`boolean`	Whether the collection allows empty selection.
`selectedKeys`	`'all' \| Iterable<Key>`	The currently selected keys in the collection (controlled).
`defaultSelectedKeys`	`'all' \| Iterable<Key>`	The initial selected keys in the collection (uncontrolled).
`onSelectionChange`	`( (keys: Selection )) => any`	Handler that is called when the selection changes.
`id`	`string`	The element's unique identifier. See MDN.
`aria-label`	`string`	Defines a string value that labels the current element.
`aria-labelledby`	`string`	Identifies the element (or elements) that labels the current element.
`aria-describedby`	`string`	Identifies the element (or elements) that describes the object.
`aria-details`	`string`	Identifies the element (or elements) that provide a detailed, extended description for the object.

Method	Description
`getKeyBelow( (key: Key )): Key`	Returns the key visually below the given one, or `null` for none.
`getKeyAbove( (key: Key )): Key`	Returns the key visually above the given one, or `null` for none.
`getKeyLeftOf( (key: Key )): Key`	Returns the key visually to the left of the given one, or `null` for none.
`getKeyRightOf( (key: Key )): Key`	Returns the key visually to the right of the given one, or `null` for none.
`getKeyPageBelow( (key: Key )): Key`	Returns the key visually one page below the given one, or `null` for none.
`getKeyPageAbove( (key: Key )): Key`	Returns the key visually one page above the given one, or `null` for none.
`getFirstKey( (key: Key, , global: boolean )): Key`	Returns the first key, or `null` for none.
`getLastKey( (key: Key, , global: boolean )): Key`	Returns the last key, or `null` for none.
`getKeyForSearch( (search: string, , fromKey: Key )): Key`	Returns the next key after `fromKey` that matches the given search string, or `null` for none.

CollectionElement<T>
  | CollectionElement<T>[]
  | (
    (item: T
  )) => CollectionElement<T>

SectionElement<T> | ItemElement<T>

ReactElement<SectionProps<T>>

Name	Type	Description
`children`	`ItemElement<T> \| ItemElement<T>[] \| ItemRenderer<T>`	Static child items or a function to render children.
`title`	`ReactNode`	Rendered contents of the section, e.g. a header.
`aria-label`	`string`	An accessibility label for the section.
`items`	`Iterable<T>`	Item objects in the section.

ReactElement<ItemProps<T>>

Name	Type	Description
`children`	`ReactNode`	Rendered contents of the item or child items.
`title`	`ReactNode`	Rendered contents of the item if `children` contains child items.
`textValue`	`string`	A string representation of the item's contents, used for features like typeahead.
`aria-label`	`string`	An accessibility label for this item.
`childItems`	`Iterable<T>`	A list of child item objects. Used for dynamic collections.
`hasChildItems`	`boolean`	Whether this item has children, even if not loaded yet.

(
  (item: T
)) => ItemElement<T>

'none'
  | 'single'
  | 'multiple'

'all' | Set<Key>

Properties

Name	Type	Description
`collection`	`Collection<Node<T>>`	A collection of items in the tree.
`disabledKeys`	`Set<Key>`	A set of keys for items that are disabled.
`expandedKeys`	`Set<Key>`	A set of keys for items that are expanded.
`selectionManager`	`SelectionManager`	A selection manager to read and update multiple selection state.

Methods

Method	Description
`toggleKey( (key: Key )): void`	Toggles the expanded state for an item by its key.

A generic interface to access a readonly sequential collection of unique keyed items.

Properties

Name	Type	Description
`size`	`number`	The number of items in the collection.

Methods

Method	Description
`getKeys(): Iterable<Key>`	Iterate over all keys in the collection.
`getItem( (key: Key )): T`	Get an item by its key.
`getKeyBefore( (key: Key )): Key \| null`	Get the key that comes before the given key in the collection.
`getKeyAfter( (key: Key )): Key \| null`	Get the key that comes after the given key in the collection.
`getFirstKey(): Key \| null`	Get the first key in the collection.
`getLastKey(): Key \| null`	Get the last key in the collection.

Name	Type	Description
`type`	`string`	The type of item this node represents.
`key`	`Key`	A unique key for the node.
`value`	`T`	The object value the node was created from.
`level`	`number`	The level of depth this node is at in the heirarchy.
`hasChildNodes`	`boolean`	Whether this item has children, even if not loaded yet.
`childNodes`	`Iterable<Node<T>>`	The loaded children of this node.
`rendered`	`ReactNode`	The rendered contents of this node (e.g. JSX).
`textValue`	`string`	A string value for this node, used for features like typeahead.
`aria-label`	`string`	An accessibility label for this node.
`index`	`number`	The index of this node within its parent.
`wrapper`	`( (element: ReactElement )) => ReactElement`	A function that should be called to wrap the rendered node.
`parentKey`	`Key`	The key of the parent node.
`prevKey`	`Key`	The key of the node before this node.
`nextKey`	`Key`	The key of the node after this node.
`props`	`any`	Additional properties specific to a particular node type.

An interface for reading and updating multiple selection state.

Properties

Name	Type	Description
`selectionMode`	`SelectionMode`	The type of selection that is allowed in the collection.
`disallowEmptySelection`	`boolean`	Whether the collection allows empty selection.
`isFocused`	`boolean`	Whether the collection is currently focused.
`isFocusWithinItem`	`boolean`	Whether focus is currently within a cell in the collection.
`focusedKey`	`Key`	The current focused key in the collection.
`selectedKeys`	`Set<Key>`	The currently selected keys in the collection.
`isEmpty`	`boolean`	Whether the selection is empty.
`isSelectAll`	`boolean`	Whether all items in the collection are selected.
`firstSelectedKey`	`Key \| null`
`lastSelectedKey`	`Key \| null`

Methods

Method	Description
`setFocused( (isFocused: boolean )): void`	Sets whether the collection is focused.
`setFocusWithinItem( (isFocused: boolean )): void`	Sets whether focus is currently within a cell in the collection.
`setFocusedKey( (key: Key )): void`	Sets the focused key.
`isSelected( (key: Key )): void`	Returns whether a key is selected.
`extendSelection( (toKey: Key )): void`	Extends the selection to the given key.
`toggleSelection( (key: Key )): void`	Toggles whether the given key is selected.
`replaceSelection( (key: Key )): void`	Replaces the selection with only the given key.
`selectAll(): void`	Selects all items in the collection.
`clearSelection(): void`	Removes all keys from the selection.
`toggleSelectAll(): void`	Toggles between select all and an empty selection.
`select( (key: Key, , e: PressEvent \| \| PointerEvent )): void`

Properties

Name	Type	Description
`selectionMode`	`SelectionMode`	The type of selection that is allowed in the collection.
`disallowEmptySelection`	`boolean`	Whether the collection allows empty selection.
`selectedKeys`	`Selection`	The currently selected keys in the collection.
`disabledKeys`	`Set<Key>`	The currently disabled keys in the collection.
`isFocused`	`boolean`	Whether the collection is currently focused.
`isFocusWithinItem`	`boolean`	Whether focus is currently within a cell in the collection.
`focusedKey`	`Key`	The current focused key in the collection.

Methods

Method	Description
`setSelectedKeys( (keys: Selection \| \| ( (v: Selection )) => Selection )): void`	Sets the selected keys in the collection.
`setFocused( (isFocused: boolean )): void`	Sets whether the collection is focused.
`setFocusWithinItem( (isFocused: boolean )): void`	Sets whether focus is currently within a cell in the collection.
`setFocusedKey( (key: Key )): void`	Sets the focused key.

Name	Type	Description
`menuProps`	`HTMLAttributes<HTMLElement>`	Props for the menu element.

Provides the behavior and accessibility implementation for an item in a menu. See useMenu for more details about menus.

useMenuItem<T>(
  props: AriaMenuItemProps,
  state: TreeState<T>,
  ref: RefObject<HTMLElement>
): MenuItemAria

Name	Type	Default	Description
`isDisabled`	`boolean`	—	Whether the menu item is disabled.
`isSelected`	`boolean`	—	Whether the menu item is selected.
`aria-label`	`string`	—	A screen reader only label for the menu item.
`key`	`Key`	—	The unique key for the menu item.
`onClose`	`() => void`	—	Handler that is called when the menu should close after selecting an item.
`closeOnSelect`	`boolean`	`true`	Whether the menu should close when the menu item is selected.
`isVirtualized`	`boolean`	—	Whether the menu item is contained in a virtual scrolling menu.
`onAction`	`( (key: Key )) => void`	—	Handler that is called when the user activates the item.

Name	Type	Description
`menuItemProps`	`HTMLAttributes<HTMLElement>`	Props for the menu item element.
`labelProps`	`HTMLAttributes<HTMLElement>`	Props for the main text element inside the menu item.
`descriptionProps`	`HTMLAttributes<HTMLElement>`	Props for the description text element inside the menu item, if any.
`keyboardShortcutProps`	`HTMLAttributes<HTMLElement>`	Props for the keyboard shortcut text element inside the item, if any.

A FocusScope manages focus for its descendants. It supports containing focus inside the scope, restoring focus to the previously focused element on unmount, and auto focusing children on mount. It also acts as a container for a programmatic focus management interface that can be used to move focus forward and back in response to user events.

Name	Type	Description
`children`	`ReactNode`	The contents of the focus scope.
`contain`	`boolean`	Whether to contain focus inside the scope, so users cannot move focus outside, for example in a modal dialog.
`restoreFocus`	`boolean`	Whether to restore focus back to the element that was focused when the focus scope mounted, after the focus scope unmounts.
`autoFocus`	`boolean`	Whether to auto focus the first focusable element in the focus scope on mount.

A visually hidden button that can be used to allow screen reader users to dismiss a modal or popup when there is no visual affordance to do so.

Name	Type	Description
`onDismiss`	`() => void`	Called when the dismiss button is activated.

Handles positioning overlays like popovers and menus relative to a trigger element, and updating the position when the window resizes.

useOverlayPosition(
  (props: AriaPositionProps
)): PositionAria

Name	Type	Default	Description
`targetRef`	`RefObject<HTMLElement>`	—	The ref for the element which the overlay positions itself with respect to.
`overlayRef`	`RefObject<HTMLElement>`	—	The ref for the overlay element.
`boundaryElement`	`HTMLElement`	`document.body`	Element that that serves as the positioning boundary.
`scrollRef`	`RefObject<HTMLElement>`	`overlayRef`	A ref for the scrollable region within the overlay.
`shouldUpdatePosition`	`boolean`	`true`	Whether the overlay should update its position automatically.
`onClose`	`() => void`	—	Handler that is called when the overlay should close.
`placement`	`Placement`	`'bottom'`	The placement of the element with respect to its anchor element.
`containerPadding`	`number`	`12`	The placement padding that should be applied between the element and its surrounding container.
`offset`	`number`	`0`	The additional offset applied along the main axis between the element and its anchor element.
`crossOffset`	`number`	`0`	The additional offset applied along the cross axis between the element and its anchor element.
`shouldFlip`	`boolean`	`true`	Whether the element should flip its orientation (e.g. top to bottom or left to right) when there is insufficient room for it to render completely.
`isOpen`	`boolean`	—	Whether the element is rendered.

'bottom'
  | 'bottom left'
  | 'bottom right'
  | 'bottom start'
  | 'bottom end'
  | 'top'
  | 'top left'
  | 'top right'
  | 'top start'
  | 'top end'
  | 'left'
  | 'left top'
  | 'left bottom'
  | 'start'
  | 'start top'
  | 'start bottom'
  | 'right'
  | 'right top'
  | 'right bottom'
  | 'end'
  | 'end top'
  | 'end bottom'

Properties

Name	Type	Description
`overlayProps`	`HTMLAttributes<Element>`	Props for the overlay container element.
`arrowProps`	`HTMLAttributes<Element>`	Props for the overlay tip arrow if any.
`placement`	`PlacementAxis`	Placement of the overlay with respect to the overlay trigger.

Methods

Method	Description
`updatePosition(): void`	Updates the position of the overlay.

Axis | 'center'

'top'
  | 'bottom'
  | 'left'
  | 'right'