use-roving-index

Usage

use-roving-index implements the roving tabindex keyboard navigation pattern. In a group of focusable elements, only one element has tabIndex={0} (can be reached with Tab key), while all others have tabIndex={-1}. Arrow keys move focus between items in the group.

import { Button, Group } from '@mantine/core';
import { useRovingIndex } from '@mantine/hooks';

const items = ['Bold', 'Italic', 'Underline', 'Strikethrough', 'Code'];

function Demo() {
  const { getItemProps } = useRovingIndex({
    total: items.length,
    orientation: 'horizontal',
    loop: true,
  });

  return (
    <Group gap="xs">
      {items.map((item, index) => (
        <Button key={item} variant="default" {...getItemProps({ index })}>
          {item}
        </Button>
      ))}
    </Group>
  );
}

Orientation

Set orientation to control which arrow keys are used for navigation:

'horizontal' (default) – ArrowLeft/ArrowRight
'vertical' – ArrowUp/ArrowDown
'both' – all four arrow keys

import { Stack, UnstyledButton } from '@mantine/core';
import { useRovingIndex } from '@mantine/hooks';

const items = ['General', 'Account', 'Security', 'Notifications', 'Privacy'];

function Demo() {
  const { getItemProps, focusedIndex } = useRovingIndex({
    total: items.length,
    orientation: 'vertical',
    loop: true,
  });

  return (
    <Stack gap={4} w={200}>
      {items.map((item, index) => (
        <UnstyledButton
          key={item}
          {...getItemProps({ index })}
          p="xs"
          style={{
            borderRadius: 'var(--mantine-radius-sm)',
            backgroundColor:
              focusedIndex === index
                ? 'var(--mantine-color-blue-light)'
                : undefined,
          }}
        >
          {item}
        </UnstyledButton>
      ))}
    </Stack>
  );
}

Grid navigation

Set columns to enable 2D grid navigation. ArrowLeft/ArrowRight navigate within a row, ArrowUp/ArrowDown navigate across rows preserving the column position. Navigation stops at grid boundaries. Use Ctrl+Home/Ctrl+End to jump to the first/last item in the grid, and Home/End to jump to the first/last item in the current row.

import { SimpleGrid, UnstyledButton } from '@mantine/core';
import { useRovingIndex } from '@mantine/hooks';

function Demo() {
  const total = 9;
  const columns = 3;

  const { getItemProps, focusedIndex } = useRovingIndex({
    total,
    columns,
  });

  return (
    <SimpleGrid cols={columns} w={300} spacing="xs">
      {Array.from({ length: total }, (_, index) => (
        <UnstyledButton
          key={index}
          {...getItemProps({ index })}
          p="md"
          ta="center"
          style={{
            borderRadius: 'var(--mantine-radius-sm)',
            border: '1px solid var(--mantine-color-default-border)',
            backgroundColor:
              focusedIndex === index
                ? 'var(--mantine-color-blue-light)'
                : undefined,
          }}
        >
          Cell {index + 1}
        </UnstyledButton>
      ))}
    </SimpleGrid>
  );
}

Disabled items

Use isItemDisabled callback to mark items as disabled. Disabled items are skipped during keyboard navigation. If the initially focused item is disabled, the first non-disabled item receives focus instead.

import { Button, Group } from '@mantine/core';
import { useRovingIndex } from '@mantine/hooks';

const items = ['Cut', 'Copy', 'Paste', 'Delete', 'Select All'];
const disabledIndices = new Set([1, 3]);

function Demo() {
  const { getItemProps } = useRovingIndex({
    total: items.length,
    orientation: 'horizontal',
    loop: true,
    isItemDisabled: (index) => disabledIndices.has(index),
  });

  return (
    <Group gap="xs">
      {items.map((item, index) => (
        <Button
          key={item}
          variant="default"
          disabled={disabledIndices.has(index)}
          {...getItemProps({ index })}
        >
          {item}
        </Button>
      ))}
    </Group>
  );
}

Loop

By default, navigation wraps around at boundaries (loop is true). Set loop={false} to stop at the first and last items.

Loop navigation

import { useState } from 'react';
import { Button, Checkbox, Group, Stack } from '@mantine/core';
import { useRovingIndex } from '@mantine/hooks';

const items = ['First', 'Second', 'Third', 'Fourth', 'Fifth'];

function Demo() {
  const [loop, setLoop] = useState(true);
  const { getItemProps } = useRovingIndex({
    total: items.length,
    orientation: 'horizontal',
    loop,
  });

  return (
    <Stack>
      <Checkbox
        label="Loop navigation"
        checked={loop}
        onChange={(event) => setLoop(event.currentTarget.checked)}
      />
      <Group gap="xs">
        {items.map((item, index) => (
          <Button key={item} variant="default" {...getItemProps({ index })}>
            {item}
          </Button>
        ))}
      </Group>
    </Stack>
  );
}

Controlled mode

Use focusedIndex and onFocusChange to control the focused index externally:

import { useState } from 'react';
import { useRovingIndex } from '@mantine/hooks';

function Demo() {
  const [focusedIndex, setFocusedIndex] = useState(0);
  const { getItemProps } = useRovingIndex({
    total: 5,
    focusedIndex,
    onFocusChange: setFocusedIndex,
  });

  // ...
}

activateOnFocus

Set activateOnFocus to true to automatically click items when they receive focus via keyboard navigation. This is useful for tab-like interfaces where focus and selection should be synchronized:

import { useRovingIndex } from '@mantine/hooks';

function Demo() {
  const { getItemProps } = useRovingIndex({
    total: 5,
    activateOnFocus: true,
  });

  // ...
}

RTL support

Set dir="rtl" to swap ArrowLeft/ArrowRight behavior for right-to-left layouts:

import { useRovingIndex } from '@mantine/hooks';

function Demo() {
  const { getItemProps } = useRovingIndex({
    total: 5,
    dir: 'rtl',
  });

  // ...
}

Definition

export interface UseRovingIndexInput {
  /** Total number of items in the group */
  total: number;

  /** Which arrow keys navigate, `'horizontal'` by default */
  orientation?: 'horizontal' | 'vertical' | 'both';

  /** Whether navigation wraps at boundaries, `true` by default */
  loop?: boolean;

  /** Text direction, `'ltr'` by default */
  dir?: 'rtl' | 'ltr';

  /** Whether to click element when it receives focus via keyboard, `false` by default */
  activateOnFocus?: boolean;

  /** Number of columns for grid (2D) navigation. When set, enables grid mode */
  columns?: number;

  /** Controlled focused index */
  focusedIndex?: number;

  /** Initial focused index for uncontrolled mode, first non-disabled item by default */
  initialIndex?: number;

  /** Called when focused index changes */
  onFocusChange?: (index: number) => void;

  /** Function to check if item at given index is disabled, `() => false` by default */
  isItemDisabled?: (index: number) => boolean;
}

export interface UseRovingIndexGetItemPropsInput {
  /** Index of the item in the group */
  index: number;

  /** Called when item is clicked */
  onClick?: React.MouseEventHandler;

  /** Called when keydown event fires on item */
  onKeyDown?: React.KeyboardEventHandler;
}

export interface UseRovingIndexReturnValue {
  /** Get props to spread on each navigable item */
  getItemProps: (options: UseRovingIndexGetItemPropsInput) => {
    tabIndex: 0 | -1;
    onKeyDown: React.KeyboardEventHandler;
    onClick: React.MouseEventHandler;
    ref: React.RefCallback<HTMLElement>;
  };

  /** Currently focused index */
  focusedIndex: number;

  /** Programmatically set focused index */
  setFocusedIndex: (index: number) => void;
}

function useRovingIndex(input: UseRovingIndexInput): UseRovingIndexReturnValue;

Exported types

UseRovingIndexInput, UseRovingIndexGetItemPropsInput and UseRovingIndexReturnValue types are exported from the @mantine/hooks package; you can import them in your application:

import type {
  UseRovingIndexInput,
  UseRovingIndexGetItemPropsInput,
  UseRovingIndexReturnValue,
} from '@mantine/hooks';

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