beta

Tree

A tree provides users with a way to navigate nested hierarchical information, with support for keyboard navigation and selection.

install	`yarn add react-aria-components`
version	1.4.2
usage	`import {UNSTABLE_Tree} from 'react-aria-components'`

View ARIA pattern

Under construction

This component is in beta. More documentation is coming soon!

Example#

import {
  UNSTABLE_Tree as Tree,
  UNSTABLE_TreeItem as TreeItem,
  UNSTABLE_TreeItemContent as TreeItemContent,
  Button,
  Collection
} from 'react-aria-components';
import {MyCheckbox} from './Checkbox';

let items = [
  {id: 1, title: 'Documents', children: [
    {id: 2, title: 'Project', children: [
      {id: 3, title: 'Weekly Report', children: []}
    ]}
  ]},
  {id: 4, title: 'Photos', children: [
    {id: 5, title: 'Image 1', children: []},
    {id: 6, title: 'Image 2', children: []}
  ]}
];

<Tree aria-label="Files" selectionMode="multiple" items={items}>
  {function renderItem(item) {
    return (
      <TreeItem textValue={item.title}>
        <TreeItemContent>
          {item.children.length ? <Button slot="chevron">
            <svg viewBox="0 0 24 24">
              <path d="m8.25 4.5 7.5 7.5-7.5 7.5" />
            </svg>
          </Button> : null}
          <MyCheckbox slot="selection" />
          {item.title}
          <Button aria-label="Info">ⓘ</Button>
        </TreeItemContent>
        <Collection items={item.children}>
          {renderItem}
        </Collection>
      </TreeItem>
    );
  }}
</Tree>

import {
  Button,
  Collection,
  UNSTABLE_Tree as Tree,
  UNSTABLE_TreeItem as TreeItem,
  UNSTABLE_TreeItemContent as TreeItemContent
} from 'react-aria-components';
import {MyCheckbox} from './Checkbox';

let items = [
  {
    id: 1,
    title: 'Documents',
    children: [
      {
        id: 2,
        title: 'Project',
        children: [
          { id: 3, title: 'Weekly Report', children: [] }
        ]
      }
    ]
  },
  {
    id: 4,
    title: 'Photos',
    children: [
      { id: 5, title: 'Image 1', children: [] },
      { id: 6, title: 'Image 2', children: [] }
    ]
  }
];

<Tree
  aria-label="Files"
  selectionMode="multiple"
  items={items}
>
  {function renderItem(item) {
    return (
      <TreeItem textValue={item.title}>
        <TreeItemContent>
          {item.children.length
            ? (
              <Button slot="chevron">
                <svg viewBox="0 0 24 24">
                  <path d="m8.25 4.5 7.5 7.5-7.5 7.5" />
                </svg>
              </Button>
            )
            : null}
          <MyCheckbox slot="selection" />
          {item.title}
          <Button aria-label="Info">ⓘ</Button>
        </TreeItemContent>
        <Collection items={item.children}>
          {renderItem}
        </Collection>
      </TreeItem>
    );
  }}
</Tree>

import {
  Button,
  Collection,
  UNSTABLE_Tree as Tree,
  UNSTABLE_TreeItem
    as TreeItem,
  UNSTABLE_TreeItemContent
    as TreeItemContent
} from 'react-aria-components';
import {MyCheckbox} from './Checkbox';

let items = [
  {
    id: 1,
    title: 'Documents',
    children: [
      {
        id: 2,
        title: 'Project',
        children: [
          {
            id: 3,
            title:
              'Weekly Report',
            children: []
          }
        ]
      }
    ]
  },
  {
    id: 4,
    title: 'Photos',
    children: [
      {
        id: 5,
        title: 'Image 1',
        children: []
      },
      {
        id: 6,
        title: 'Image 2',
        children: []
      }
    ]
  }
];

<Tree
  aria-label="Files"
  selectionMode="multiple"
  items={items}
>
  {function renderItem(
    item
  ) {
    return (
      <TreeItem
        textValue={item
          .title}
      >
        <TreeItemContent>
          {item
              .children
              .length
            ? (
              <Button slot="chevron">
                <svg viewBox="0 0 24 24">
                  <path d="m8.25 4.5 7.5 7.5-7.5 7.5" />
                </svg>
              </Button>
            )
            : null}
          <MyCheckbox slot="selection" />
          {item.title}
          <Button aria-label="Info">
            ⓘ
          </Button>
        </TreeItemContent>
        <Collection
          items={item
            .children}
        >
          {renderItem}
        </Collection>
      </TreeItem>
    );
  }}
</Tree>

Show CSS

.react-aria-Tree {
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: auto;
  padding: 4px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--overlay-background);
  forced-color-adjust: none;
  outline: none;
  width: 250px;
  max-height: 300px;
  box-sizing: border-box;

  &[data-focus-visible] {
    outline: 2px solid var(--focus-ring-color);
    outline-offset: -1px;
  }

  .react-aria-TreeItem {
    display: flex;
    align-items: center;
    gap: 0.571rem;
    min-height: 28px;
    padding: 0.286rem 0.286rem 0.286rem 0.571rem;
    --padding: 20px;
    padding-left: calc((var(--tree-item-level) - 1) * 20px + 0.571rem + var(--padding));
    border-radius: 6px;
    outline: none;
    cursor: default;
    color: var(--text-color);
    font-size: 1.072rem;
    position: relative;
    transform: translateZ(0);

    &[data-has-child-rows] {
      --padding: 0px;
    }

    .react-aria-Button[slot=chevron] {
      all: unset;
      display: flex;
      align-items: center;
      justify-content: center;
      width: 1.143rem;
      height: 1.143rem;

      svg {
        rotate: 0deg;
        transition: rotate 200ms;
        width: 12px;
        height: 12px;
        fill: none;
        stroke: currentColor;
        stroke-width: 3px;
      }
    }

    &[data-expanded] .react-aria-Button[slot=chevron] svg {
      rotate: 90deg;
    }

    &[data-focus-visible] {
      outline: 2px solid var(--focus-ring-color);
      outline-offset: -2px;
    }

    &[data-pressed] {
      background: var(--gray-100);
    }

    &[data-selected] {
      background: var(--highlight-background);
      color: var(--highlight-foreground);
      --focus-ring-color: var(--highlight-foreground);

      &[data-focus-visible] {
        outline-color: var(--highlight-foreground);
        outline-offset: -4px;
      }

      .react-aria-Button {
        color: var(--highlight-foreground);
        --highlight-hover: rgb(255 255 255 / 0.1);
        --highlight-pressed: rgb(255 255 255 / 0.2);
      }
    }

    &[data-disabled] {
      color: var(--text-color-disabled);
    }

    .react-aria-Button:not([slot]) {
      margin-left: auto;
      background: transparent;
      border: none;
      font-size: 1.2rem;
      line-height: 1.2em;
      padding: 0.286rem 0.429rem;
      transition: background 200ms;

      &[data-hovered] {
        background: var(--highlight-hover);
      }

      &[data-pressed] {
        background: var(--highlight-pressed);
        box-shadow: none;
      }
    }
  }

  /* join selected items if :has selector is supported */
  @supports selector(:has(.foo)) {
    gap: 0;

    .react-aria-TreeItem[data-selected]:has(+ [data-selected]) {
      border-end-start-radius: 0;
      border-end-end-radius: 0;
    }

    .react-aria-TreeItem[data-selected] + [data-selected] {
      border-start-start-radius: 0;
      border-start-end-radius: 0;
    }
  }

  :where(.react-aria-TreeItem) .react-aria-Checkbox {
    --selected-color: var(--highlight-foreground);
    --selected-color-pressed: var(--highlight-foreground-pressed);
    --checkmark-color: var(--highlight-background);
    --background-color: var(--highlight-background);
  }
}

.react-aria-Tree {
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: auto;
  padding: 4px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--overlay-background);
  forced-color-adjust: none;
  outline: none;
  width: 250px;
  max-height: 300px;
  box-sizing: border-box;

  &[data-focus-visible] {
    outline: 2px solid var(--focus-ring-color);
    outline-offset: -1px;
  }

  .react-aria-TreeItem {
    display: flex;
    align-items: center;
    gap: 0.571rem;
    min-height: 28px;
    padding: 0.286rem 0.286rem 0.286rem 0.571rem;
    --padding: 20px;
    padding-left: calc((var(--tree-item-level) - 1) * 20px + 0.571rem + var(--padding));
    border-radius: 6px;
    outline: none;
    cursor: default;
    color: var(--text-color);
    font-size: 1.072rem;
    position: relative;
    transform: translateZ(0);

    &[data-has-child-rows] {
      --padding: 0px;
    }

    .react-aria-Button[slot=chevron] {
      all: unset;
      display: flex;
      align-items: center;
      justify-content: center;
      width: 1.143rem;
      height: 1.143rem;

      svg {
        rotate: 0deg;
        transition: rotate 200ms;
        width: 12px;
        height: 12px;
        fill: none;
        stroke: currentColor;
        stroke-width: 3px;
      }
    }

    &[data-expanded] .react-aria-Button[slot=chevron] svg {
      rotate: 90deg;
    }

    &[data-focus-visible] {
      outline: 2px solid var(--focus-ring-color);
      outline-offset: -2px;
    }

    &[data-pressed] {
      background: var(--gray-100);
    }

    &[data-selected] {
      background: var(--highlight-background);
      color: var(--highlight-foreground);
      --focus-ring-color: var(--highlight-foreground);

      &[data-focus-visible] {
        outline-color: var(--highlight-foreground);
        outline-offset: -4px;
      }

      .react-aria-Button {
        color: var(--highlight-foreground);
        --highlight-hover: rgb(255 255 255 / 0.1);
        --highlight-pressed: rgb(255 255 255 / 0.2);
      }
    }

    &[data-disabled] {
      color: var(--text-color-disabled);
    }

    .react-aria-Button:not([slot]) {
      margin-left: auto;
      background: transparent;
      border: none;
      font-size: 1.2rem;
      line-height: 1.2em;
      padding: 0.286rem 0.429rem;
      transition: background 200ms;

      &[data-hovered] {
        background: var(--highlight-hover);
      }

      &[data-pressed] {
        background: var(--highlight-pressed);
        box-shadow: none;
      }
    }
  }

  /* join selected items if :has selector is supported */
  @supports selector(:has(.foo)) {
    gap: 0;

    .react-aria-TreeItem[data-selected]:has(+ [data-selected]) {
      border-end-start-radius: 0;
      border-end-end-radius: 0;
    }

    .react-aria-TreeItem[data-selected] + [data-selected] {
      border-start-start-radius: 0;
      border-start-end-radius: 0;
    }
  }

  :where(.react-aria-TreeItem) .react-aria-Checkbox {
    --selected-color: var(--highlight-foreground);
    --selected-color-pressed: var(--highlight-foreground-pressed);
    --checkmark-color: var(--highlight-background);
    --background-color: var(--highlight-background);
  }
}

.react-aria-Tree {
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: auto;
  padding: 4px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--overlay-background);
  forced-color-adjust: none;
  outline: none;
  width: 250px;
  max-height: 300px;
  box-sizing: border-box;

  &[data-focus-visible] {
    outline: 2px solid var(--focus-ring-color);
    outline-offset: -1px;
  }

  .react-aria-TreeItem {
    display: flex;
    align-items: center;
    gap: 0.571rem;
    min-height: 28px;
    padding: 0.286rem 0.286rem 0.286rem 0.571rem;
    --padding: 20px;
    padding-left: calc((var(--tree-item-level) - 1) * 20px + 0.571rem + var(--padding));
    border-radius: 6px;
    outline: none;
    cursor: default;
    color: var(--text-color);
    font-size: 1.072rem;
    position: relative;
    transform: translateZ(0);

    &[data-has-child-rows] {
      --padding: 0px;
    }

    .react-aria-Button[slot=chevron] {
      all: unset;
      display: flex;
      align-items: center;
      justify-content: center;
      width: 1.143rem;
      height: 1.143rem;

      svg {
        rotate: 0deg;
        transition: rotate 200ms;
        width: 12px;
        height: 12px;
        fill: none;
        stroke: currentColor;
        stroke-width: 3px;
      }
    }

    &[data-expanded] .react-aria-Button[slot=chevron] svg {
      rotate: 90deg;
    }

    &[data-focus-visible] {
      outline: 2px solid var(--focus-ring-color);
      outline-offset: -2px;
    }

    &[data-pressed] {
      background: var(--gray-100);
    }

    &[data-selected] {
      background: var(--highlight-background);
      color: var(--highlight-foreground);
      --focus-ring-color: var(--highlight-foreground);

      &[data-focus-visible] {
        outline-color: var(--highlight-foreground);
        outline-offset: -4px;
      }

      .react-aria-Button {
        color: var(--highlight-foreground);
        --highlight-hover: rgb(255 255 255 / 0.1);
        --highlight-pressed: rgb(255 255 255 / 0.2);
      }
    }

    &[data-disabled] {
      color: var(--text-color-disabled);
    }

    .react-aria-Button:not([slot]) {
      margin-left: auto;
      background: transparent;
      border: none;
      font-size: 1.2rem;
      line-height: 1.2em;
      padding: 0.286rem 0.429rem;
      transition: background 200ms;

      &[data-hovered] {
        background: var(--highlight-hover);
      }

      &[data-pressed] {
        background: var(--highlight-pressed);
        box-shadow: none;
      }
    }
  }

  /* join selected items if :has selector is supported */
  @supports selector(:has(.foo)) {
    gap: 0;

    .react-aria-TreeItem[data-selected]:has(+ [data-selected]) {
      border-end-start-radius: 0;
      border-end-end-radius: 0;
    }

    .react-aria-TreeItem[data-selected] + [data-selected] {
      border-start-start-radius: 0;
      border-start-end-radius: 0;
    }
  }

  :where(.react-aria-TreeItem) .react-aria-Checkbox {
    --selected-color: var(--highlight-foreground);
    --selected-color-pressed: var(--highlight-foreground-pressed);
    --checkmark-color: var(--highlight-background);
    --background-color: var(--highlight-background);
  }
}

Props#

Tree#

Name	Type	Default	Description
`selectionBehavior`	`SelectionBehavior`	—	How multiple selection should behave in the tree.
`renderEmptyState`	`( (props: TreeEmptyStateRenderProps )) => ReactNode`	—	Provides content to display when there are no items in the list.
`disabledBehavior`	`DisabledBehavior`	`'selection'`	Whether `disabledKeys` applies to all interactions, or only selection.
`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).
`children`	`ReactNode \| ( (item: object )) => ReactNode`	—	The contents of the collection.
`dependencies`	`any[]`	—	Values that should invalidate the item cache when using dynamic collections.
`className`	`string \| ( (values: TreeRenderProps & & {defaultClassName: string \| \| undefined } )) => string`	—	The CSS className for the element. A function may be provided to compute the class based on component state.
`style`	`CSSProperties \| ( (values: TreeRenderProps & & {defaultStyle: CSSProperties } )) => CSSProperties \| undefined`	—	The inline style for the element. A function may be provided to compute the style based on component state.
`expandedKeys`	`Iterable<Key>`	—	The currently expanded keys in the collection (controlled).
`defaultExpandedKeys`	`Iterable<Key>`	—	The initial expanded keys in the collection (uncontrolled).

Events

Name	Type	Description
`onAction`	`( (key: Key )) => void`	Handler that is called when a user performs an action on an item. The exact user event depends on the collection's `selectionBehavior` prop and the interaction modality.
`onSelectionChange`	`( (keys: Selection )) => void`	Handler that is called when the selection changes.
`onScroll`	`( (e: UIEvent<Element> )) => void`	Handler that is called when a user scrolls. See MDN.
`onExpandedChange`	`( (keys: Set<Key> )) => any`	Handler that is called when items are expanded or collapsed.

Layout

Name	Type	Description
`slot`	`string \| null`	A slot name for the component. Slots allow the component to receive props from a parent component. An explicit `null` value indicates that the local props completely override all props received from a parent.

Accessibility

Name	Type	Description
`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.

TreeItem#

Name	Type	Description
`textValue`	`string`	A string representation of the tree item's contents, used for features like typeahead.
`children`	`ReactNode`	The content of the tree item along with any nested children. Supports static nested tree items or use of a Collection to dynamically render nested tree items.
`id`	`Key`	The unique id of the tree row.
`value`	`object`	The object value that this tree item represents. When using dynamic collections, this is set automatically.
`className`	`string \| ( (values: TreeItemRenderProps & & {defaultClassName: string \| \| undefined } )) => string`	The CSS className for the element. A function may be provided to compute the class based on component state.
`style`	`CSSProperties \| ( (values: TreeItemRenderProps & & {defaultStyle: CSSProperties } )) => CSSProperties \| undefined`	The inline style for the element. A function may be provided to compute the style based on component state.
`href`	`Href`	A URL to link to. See MDN.
`hrefLang`	`string`	Hints at the human language of the linked URL. SeeMDN.
`target`	`HTMLAttributeAnchorTarget`	The target window for the link. See MDN.
`rel`	`string`	The relationship between the linked resource and the current page. See MDN.
`download`	`boolean \| string`	Causes the browser to download the linked URL. A string may be provided to suggest a file name. See MDN.
`ping`	`string`	A space-separated list of URLs to ping when the link is followed. See MDN.
`referrerPolicy`	`HTMLAttributeReferrerPolicy`	How much of the referrer to send when following the link. See MDN.
`routerOptions`	`RouterOptions`	Options for the configured client side router.

Events

Name	Type	Description
`onHoverStart`	`( (e: HoverEvent )) => void`	Handler that is called when a hover interaction starts.
`onHoverEnd`	`( (e: HoverEvent )) => void`	Handler that is called when a hover interaction ends.
`onHoverChange`	`( (isHovering: boolean )) => void`	Handler that is called when the hover state changes.

Accessibility

Name	Type	Description
`aria-label`	`string`	An accessibility label for this tree item.

TreeItemContent#

Name	Type	Description
`children`	`ReactNode \| ( (values: T & & {defaultChildren: ReactNode \| \| undefined } )) => ReactNode`	The children of the component. A function may be provided to alter the children based on component state.

Styling#

React Aria components can be styled in many ways, including using CSS classes, inline styles, utility classes (e.g. Tailwind), CSS-in-JS (e.g. Styled Components), etc. By default, all components include a builtin className attribute which can be targeted using CSS selectors. These follow the react-aria-ComponentName naming convention.

.react-aria-Tree {
  /* ... */
}

.react-aria-Tree {
  /* ... */
}

.react-aria-Tree {
  /* ... */
}

A custom className can also be specified on any component. This overrides the default className provided by React Aria with your own.

<TreeItem className="my-tree-item">
  {/* ... */}
</TreeItem>

<TreeItem className="my-tree-item">
  {/* ... */}
</TreeItem>

<TreeItem className="my-tree-item">
  {/* ... */}
</TreeItem>

In addition, some components support multiple UI states (e.g. focused, placeholder, readonly, etc.). React Aria components expose states using data attributes, which you can target in CSS selectors. For example:

.react-aria-TreeItem[data-expanded] {
  /* ... */
}

.react-aria-TreeItem[data-selected] {
  /* ... */
}

.react-aria-TreeItem[data-expanded] {
  /* ... */
}

.react-aria-TreeItem[data-selected] {
  /* ... */
}

.react-aria-TreeItem[data-expanded] {
  /* ... */
}

.react-aria-TreeItem[data-selected] {
  /* ... */
}

The className and style props also accept functions which receive states for styling. This lets you dynamically determine the classes or styles to apply, which is useful when using utility CSS libraries like Tailwind.

<TreeItem
  className={({ isSelected }) => isSelected ? 'bg-blue-400' : 'bg-gray-100'}
/>

<TreeItem
  className={({ isSelected }) =>
    isSelected ? 'bg-blue-400' : 'bg-gray-100'}
/>

<TreeItem
  className={(
    { isSelected }
  ) =>
    isSelected
      ? 'bg-blue-400'
      : 'bg-gray-100'}
/>

Render props may also be used as children to alter what elements are rendered based on the current state. For example, you could render a checkbox only when selection is enabled.

<TreeItem>
  {({selectionMode}) => (
    <>
      {selectionMode !== 'none' && <Checkbox />}
      Item
    </>
  )}
</TreeItem>

<TreeItem>
  {({selectionMode}) => (
    <>
      {selectionMode !== 'none' && <Checkbox />}
      Item
    </>
  )}
</TreeItem>

<TreeItem>
  {(
    { selectionMode }
  ) => (
    <>
      {selectionMode !==
          'none' && (
        <Checkbox />
      )}
      Item
    </>
  )}
</TreeItem>

The states, selectors, and render props for each component used in a Tree are documented below.

Tree#

A Tree can be targeted with the .react-aria-Tree CSS selector, or by overriding with a custom className. It supports the following states:

Name	CSS Selector	Description
`isEmpty`	`[data-empty]`	Whether the tree has no items and should display its empty state.
`isFocused`	`[data-focused]`	Whether the tree is currently focused.
`isFocusVisible`	`[data-focus-visible]`	Whether the tree is currently keyboard focused.
`state`	`—`	State of the tree.

TreeItem#

A TreeItem can be targeted with the .react-aria-TreeItem CSS selector, or by overriding with a custom className. It supports the following states and render props:

Name	CSS Selector	Description
`isExpanded`	`—`	Whether the tree item is expanded.
`isFocusVisibleWithin`	`—`	Whether the tree item's children have keyboard focus.
`isHovered`	`[data-hovered]`	Whether the item is currently hovered with a mouse.
`isPressed`	`[data-pressed]`	Whether the item is currently in a pressed state.
`isSelected`	`[data-selected]`	Whether the item is currently selected.
`isFocused`	`[data-focused]`	Whether the item is currently focused.
`isFocusVisible`	`[data-focus-visible]`	Whether the item is currently keyboard focused.
`isDisabled`	`[data-disabled]`	Whether the item is non-interactive, i.e. both selection and actions are disabled and the item may not be focused. Dependent on `disabledKeys` and `disabledBehavior`.
`selectionMode`	`[data-selection-mode="single \| multiple"]`	The type of selection that is allowed in the collection.
`selectionBehavior`	`—`	The selection behavior for the collection.

TreeItem also exposes a --tree-item-level CSS custom property, which you can use to adjust the indentation.

.react-aria-TreeItem {
  padding-left: calc((var(--tree-item-level) - 1) * 20px);
}

.react-aria-TreeItem {
  padding-left: calc((var(--tree-item-level) - 1) * 20px);
}

.react-aria-TreeItem {
  padding-left: calc((var(--tree-item-level) - 1) * 20px);
}

'toggle' | 'replace'

Name	Type	Description
`isFocused`	`boolean`	Whether the tree is currently focused.
`isFocusVisible`	`boolean`	Whether the tree is currently keyboard focused.
`state`	`TreeState<unknown>`	State of the tree.

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.
`setExpandedKeys( (keys: Set<Key> )): void`	Replaces the set of expanded keys.

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

Extends: Iterable

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 \| null`	Get an item by its key.
`at( (idx: number )): T \| null`	Get an item by the index of 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.
`getChildren( (key: Key )): Iterable<T>`	Iterate over the child items of the given key.
`getTextValue( (key: Key )): string`	Returns a string representation of the item's contents.

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

string | number

An interface for reading and updating multiple selection state.

Properties

Name	Type	Description
`collection`	`Collection<Node<unknown>>`
`selectionMode`	`SelectionMode`	The type of selection that is allowed in the collection.
`disallowEmptySelection`	`boolean`	Whether the collection allows empty selection.
`selectionBehavior`	`SelectionBehavior`	The selection behavior for the collection.
`isFocused`	`boolean`	Whether the collection is currently focused.
`focusedKey`	`Key \| null`	The current focused key in the collection.
`childFocusStrategy`	`FocusStrategy \| null`	Whether the first or last child of the focused key should receive focus.
`selectedKeys`	`Set<Key>`	The currently selected keys in the collection.
`rawSelection`	`Selection`	The raw selection value for the collection. Either 'all' for select all, or a set of keys.
`isEmpty`	`boolean`	Whether the selection is empty.
`isSelectAll`	`boolean`	Whether all items in the collection are selected.
`firstSelectedKey`	`Key \| null`
`lastSelectedKey`	`Key \| null`
`disabledKeys`	`Set<Key>`
`disabledBehavior`	`DisabledBehavior`

Methods

Method	Description
`constructor( collection: Collection<Node<unknown>>, state: MultipleSelectionState, options?: SelectionManagerOptions ): void`
`setSelectionBehavior( (selectionBehavior: SelectionBehavior )): void`	Sets the selection behavior for the collection.
`setFocused( (isFocused: boolean )): void`	Sets whether the collection is focused.
`setFocusedKey( (key: Key \| \| null, , childFocusStrategy?: FocusStrategy )): 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.
`setSelectedKeys( (keys: Iterable<Key> )): void`	Replaces the selection with the given keys.
`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 \| LongPressEvent \| PointerEvent )): void`
`isSelectionEqual( (selection: Set<Key> )): void`	Returns whether the current selection is equal to the given selection.
`canSelectItem( (key: Key )): void`
`isDisabled( (key: Key )): void`
`isLink( (key: Key )): void`
`getItemProps( (key: Key )): void`

Properties

Name	Type	Description
`selectionMode`	`SelectionMode`	The type of selection that is allowed in the collection.
`selectionBehavior`	`SelectionBehavior`	The selection behavior for 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.
`disabledBehavior`	`DisabledBehavior`	Whether `disabledKeys` applies to selection, actions, or both.
`isFocused`	`boolean`	Whether the collection is currently focused.
`focusedKey`	`Key \| null`	The current focused key in the collection.
`childFocusStrategy`	`FocusStrategy \| null`	Whether the first or last child of the focused key should receive focus.

Methods

Method	Description
`setSelectionBehavior( (selectionBehavior: SelectionBehavior )): void`	Sets the selection behavior for the collection.
`setSelectedKeys( (keys: Selection )): void`	Sets the selected keys in the collection.
`setFocused( (isFocused: boolean )): void`	Sets whether the collection is focused.
`setFocusedKey( (key: Key \| \| null, , child?: FocusStrategy )): void`	Sets the focused key, and optionally, whether the first or last child of that key should receive focus.

'none'
  | 'single'
  | 'multiple'

'all' | Set<Key>

'selection' | 'all'

'first' | 'last'

A LayoutDelegate provides layout information for collection items.

Method	Description
`getItemRect( (key: Key )): Rect \| null`	Returns a rectangle for the item with the given key.
`getVisibleRect(): Rect`	Returns the visible rectangle of the collection.
`getContentSize(): Size`	Returns the size of the scrollable content in the collection.
`getKeyRange( (from: Key, , to: Key )): Key[]`	Returns a list of keys between `from` and `to`.

Name	Type	Description
`x`	`number`
`y`	`number`
`width`	`number`
`height`	`number`

Name	Type	Description
`width`	`number`
`height`	`number`

Name	Type	Description
`allowsCellSelection`	`boolean`
`layoutDelegate`	`LayoutDelegate`

Properties

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`	`Element`	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.
`altKey`	`boolean`	Whether the alt keyboard modifier was held during the press event.
`x`	`number`	X position relative to the target.
`y`	`number`	Y position relative to the target.

Methods

Method	Description
`continuePropagation(): void`	By default, press events stop propagation to parent elements. In cases where a handler decides not to handle a specific event, it can call `continuePropagation()` to allow a parent to handle it.

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

Name	Type	Description
`type`	`'longpressstart' \| 'longpressend' \| 'longpress'`	The type of long press event being fired.
`pointerType`	`PointerType`	The pointer type that triggered the press event.
`target`	`Element`	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.
`altKey`	`boolean`	Whether the alt keyboard modifier was held during the press event.
`x`	`number`	X position relative to the target.
`y`	`number`	Y position relative to the target.

Name	Type	Description
`isEmpty`	`boolean`	Whether the tree has no items and should display its empty state.
`isFocused`	`boolean`	Whether the tree is currently focused.
`isFocusVisible`	`boolean`	Whether the tree is currently keyboard focused.
`state`	`TreeState<unknown>`	State of the tree.

Name	Type	Description
`isExpanded`	`boolean`	Whether the tree item is expanded.
`isFocusVisibleWithin`	`boolean`	Whether the tree item's children have keyboard focus.
`isHovered`	`boolean`	Whether the item is currently hovered with a mouse.
`isPressed`	`boolean`	Whether the item is currently in a pressed state.
`isSelected`	`boolean`	Whether the item is currently selected.
`isFocused`	`boolean`	Whether the item is currently focused.
`isFocusVisible`	`boolean`	Whether the item is currently keyboard focused.
`isDisabled`	`boolean`	Whether the item is non-interactive, i.e. both selection and actions are disabled and the item may not be focused. Dependent on `disabledKeys` and `disabledBehavior`.
`selectionMode`	`SelectionMode`	The type of selection that is allowed in the collection.
`selectionBehavior`	`SelectionBehavior`	The selection behavior for the collection.

RouterConfig extends {href: any
} ? H : string

RouterConfig extends {routerOptions: any
} ? O : never

Name	Type	Description
`type`	`'hoverstart' \| 'hoverend'`	The type of hover event being fired.
`pointerType`	`'mouse' \| 'pen'`	The pointer type that triggered the hover event.
`target`	`HTMLElement`	The target element of the hover event.