FocusTrap

Trap focus at child node

Import

Source

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Package

@mantine/core

Usage

FocusTrap is a component implementation of use-focus-trap hook, it is used in all Mantine components that require focus trap (Modal, DatePicker, Popover, etc.).

First input

Second input

Third input

import { useDisclosure } from '@mantine/hooks';
import { FocusTrap, TextInput, Button, Box } from '@mantine/core';

function Demo() {
  const [active, { toggle }] = useDisclosure(false);

  return (
    <Box maw={400} mx="auto">
      <Button onClick={toggle}>{active ? 'Deactivate' : 'Activate'} focus trap</Button>

      <FocusTrap active={active}>
        <div>
          <TextInput mt="sm" label="First input" placeholder="First input" />
          <TextInput mt="sm" label="Second input" placeholder="Second input" />
          <TextInput mt="sm" label="Third input" placeholder="Third input" />
        </div>
      </FocusTrap>
    </Box>
  );
}

Initial focus

To define the element that will receive initial focus set data-autofocus attribute:

First input

Second input

Third input

import { useDisclosure } from '@mantine/hooks';
import { FocusTrap, TextInput, Button, Box } from '@mantine/core';

function Demo() {
  const [active, { toggle }] = useDisclosure(false);

  return (
    <Box maw={400} mx="auto">
      <Button onClick={toggle}>{active ? 'Deactivate' : 'Activate'} focus trap</Button>

      <FocusTrap active={active}>
        <div>
          <TextInput mt="sm" label="First input" placeholder="First input" />
          <TextInput mt="sm" label="Second input" placeholder="Second input" data-autofocus />
          <TextInput mt="sm" label="Third input" placeholder="Third input" />
        </div>
      </FocusTrap>
    </Box>
  );
}

FocusTrap.InitialFocus is a special component that adds a visually hidden element which will receive the focus when the focus trap is activated. Once FocusTrap.InitialFocus loses focus, it is removed from the tab order.

For example, it is useful if you do not want to focus any elements inside the Modal when it is opened:

import { useDisclosure } from '@mantine/hooks';
import { Modal, Button, TextInput, FocusTrap } from '@mantine/core';

function Demo() {
  const [opened, { open, close }] = useDisclosure(false);

  return (
    <>
      <Modal opened={opened} onClose={close} title="Focus demo">
        <FocusTrap.InitialFocus />
        <TextInput label="First input" placeholder="First input" />
        <TextInput
          data-autofocus
          label="Input with initial focus"
          placeholder="It has data-autofocus attribute"
          mt="md"
        />
      </Modal>

      <Button onClick={open}>Open modal</Button>
    </>
  );
}

Focus trapping logic

Focus is trapped within child node if active prop is true
When FocusTrap component is mounted or when active prop changes from false to true first element with data-autofocus attribute is focused
If there are no elements with data-autofocus attribute, then the first element that supports keyboard interaction is focused
If the target element does not have focusable elements or does not support ref, then the focus trap will not work
Trap stops working when element outside of the FocusTrap child is focused

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