Tree

Display a Tree structure

Import

Source

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Docs

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Package

@mantine/core

Usage

Tree component is used to display hierarchical data. Tree component has minimal styling by default, you can customize styles with Styles API.

src
node_modules
package.json
tsconfig.json

import { Tree } from '@mantine/core';
import { data } from './data';

function Demo() {
  return <Tree data={data} />;
}

Data prop

Data passed to the data prop should follow these rules:

Data must be an array
Each item in the array represents a node in the tree
Each node must be an object with value and label keys
Each node can have children key with an array of child nodes
The value of each node must be unique

Valid data example:

// ✅ Valid data, all values are unique
const data = [
  {
    value: 'src',
    label: 'src',
    children: [
      { value: 'src/components', label: 'components' },
      { value: 'src/hooks', label: 'hooks' },
    ],
  },
  { value: 'package.json', label: 'package.json' },
];

Invalid data example:

// ❌ Invalid data, values are not unique (components is used twice)
const data = [
  {
    value: 'src',
    label: 'src',
    children: [{ value: 'components', label: 'components' }],
  },
  { value: 'components', label: 'components' },
];

Data type

You can import TreeNodeData type to define data type for your tree:

import { TreeNodeData } from '@mantine/core';

const data: TreeNodeData[] = [
  {
    value: 'src',
    label: 'src',
    children: [
      { value: 'src/components', label: 'components' },
      { value: 'src/hooks', label: 'hooks' },
    ],
  },
  { value: 'package.json', label: 'package.json' },
];

renderNode

Use renderNode prop to customize node rendering. renderNode function receives an object with the following properties as a single argument:

export interface RenderTreeNodePayload {
  /** Node level in the tree */
  level: number;

  /** `true` if the node is expanded, applicable only for nodes with `children` */
  expanded: boolean;

  /** `true` if the node has non-empty `children` array */
  hasChildren: boolean;

  /** `true` if the node is selected */
  selected: boolean;

  /** Node data from the `data` prop of `Tree` */
  node: TreeNodeData;

  /** Props to spread into the root node element */
  elementProps: {
    className: string;
    style: React.CSSProperties;
    onClick: (event: React.MouseEvent) => void;
    'data-selected': boolean | undefined;
    'data-value': string;
    'data-hovered': boolean | undefined;
  };
}

src
node_modules
package.json
tsconfig.json

import { IconChevronDown } from '@tabler/icons-react';
import { Group, Tree } from '@mantine/core';
import { data } from './data';

function Demo() {
  return (
    <Tree
      data={data}
      levelOffset={23}
      renderNode={({ node, expanded, hasChildren, elementProps }) => (
        <Group gap={5} {...elementProps}>
          {hasChildren && (
            <IconChevronDown
              size={18}
              style={{ transform: expanded ? 'rotate(180deg)' : 'rotate(0deg)' }}
            />
          )}

          <span>{node.label}</span>
        </Group>
      )}
    />
  );
}

useTree hook

useTree hook can be used to control selected and expanded state of the tree.

The hook accepts an object with the following properties:

export interface UseTreeInput {
  /** Initial expanded state of all nodes */
  initialExpandedState?: TreeExpandedState;

  /** Initial selected state of nodes */
  initialSelectedState?: string[];

  /** Determines whether multiple node can be selected at a time */
  multiple?: boolean;
}

And returns an object with the following properties:

export interface UseTreeReturnType {
  /** Determines whether multiple node can be selected at a time */
  multiple: boolean;

  /** A record of `node.value` and boolean values that represent nodes expanded state */
  expandedState: TreeExpandedState;

  /** An array of selected nodes values */
  selectedState: string[];

  /** A value of the node that was last clicked
   * Anchor node is used to determine range of selected nodes for multiple selection
   */
  anchorNode: string | null;

  /** Initializes tree state based on provided data, called automatically by the Tree component */
  initialize: (data: TreeNodeData[]) => void;

  /** Toggles expanded state of the node with provided value */
  toggleExpanded: (value: string) => void;

  /** Collapses node with provided value */
  collapse: (value: string) => void;

  /** Expands node with provided value */
  expand: (value: string) => void;

  /** Expands all nodes */
  expandAllNodes: () => void;

  /** Collapses all nodes */
  collapseAllNodes: () => void;

  /** Sets expanded state */
  setExpandedState: React.Dispatch<
    React.SetStateAction<TreeExpandedState>
  >;

  /** Toggles selected state of the node with provided value */
  toggleSelected: (value: string) => void;

  /** Selects node with provided value */
  select: (value: string) => void;

  /** Deselects node with provided value */
  deselect: (value: string) => void;

  /** Clears selected state */
  clearSelected: () => void;

  /** Sets selected state */
  setSelectedState: React.Dispatch<React.SetStateAction<string[]>>;

  /** A value of the node that is currently hovered */
  hoveredNode: string | null;

  /** Sets hovered node */
  setHoveredNode: React.Dispatch<React.SetStateAction<string | null>>;
}

You can pass the value returned by the useTree hook to the tree prop of the Tree component to control tree state:

src
node_modules
package.json
tsconfig.json

import { Button, Group, Tree, useTree } from '@mantine/core';
import { data } from './data';

function Demo() {
  const tree = useTree();

  return (
    <>
      <Tree data={data} tree={tree} />
      <Group mt="md">
        <Button onClick={() => tree.expandAllNodes()}>Expand all</Button>
        <Button onClick={() => tree.collapseAllNodes()}>Collapse all</Button>
      </Group>
    </>
  );
}

Example: files tree

src
node_modules
package.json
tsconfig.json

import { IconFolder, IconFolderOpen } from '@tabler/icons-react';
import { Group, RenderTreeNodePayload, Tree } from '@mantine/core';
import { CssIcon, NpmIcon, TypeScriptCircleIcon } from '@mantinex/dev-icons';
import { data, dataCode } from './data';
import classes from './Demo.module.css';

interface FileIconProps {
  name: string;
  isFolder: boolean;
  expanded: boolean;
}

function FileIcon({ name, isFolder, expanded }: FileIconProps) {
  if (name.endsWith('package.json')) {
    return <NpmIcon size={14} />;
  }

  if (name.endsWith('.ts') || name.endsWith('.tsx') || name.endsWith('tsconfig.json')) {
    return <TypeScriptCircleIcon size={14} />;
  }

  if (name.endsWith('.css')) {
    return <CssIcon size={14} />;
  }

  if (isFolder) {
    return expanded ? (
      <IconFolderOpen color="var(--mantine-color-yellow-9)" size={14} stroke={2.5} />
    ) : (
      <IconFolder color="var(--mantine-color-yellow-9)" size={14} stroke={2.5} />
    );
  }

  return null;
}

function Leaf({ node, expanded, hasChildren, elementProps }: RenderTreeNodePayload) {
  return (
    <Group gap={5} {...elementProps}>
      <FileIcon name={node.value} isFolder={hasChildren} expanded={expanded} />
      <span>{node.label}</span>
    </Group>
  );
}

function Demo() {
  return (
    <Tree
      classNames={classes}
      selectOnClick
      clearSelectionOnOutsideClick
      data={data}
      renderNode={(payload) => <Leaf {...payload} />}
    />
  );
}

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