react/packages/react-interactions/events/docs/FocusWithin.md

FocusWithin

The useFocusWithin hooks responds to focus and blur events on its child. Focus events are dispatched for all input types, with the exception of onFocusVisibleChange which is only dispatched when focusing with a keyboard.

Focus events do not propagate between useFocusWithin event responders.

// Example
const Button = (props) => {
  const [ isFocusWithin, updateFocusWithin ] = useState(false);
  const [ isFocusWithinVisible, updateFocusWithinVisible ] = useState(false);
  const focusWithin = useFocusWithin({
    onFocusWithinChange={updateFocusWithin}
    onFocusWithinVisibleChange={updateFocusWithinVisible}
  });

  return (
    <button
      children={props.children}
      listeners={focusWithin}
      style={{
        ...(isFocusWithin && focusWithinStyles),
        ...(isFocusWithinVisible && focusWithinVisibleStyles)
      }}
    >
  );
};

Props

disabled: boolean = false

Disables the responder.

onFocusWithinChange: boolean => void

Called once the element or a descendant receives focus, and once focus moves outside of the element.

onFocusWithinVisibleChange: boolean => void

Called once the element or a descendant is focused following keyboard navigation, and once focus moves outside of the element. This can be used to display focus styles only when the keyboard is being used to focus within the element's subtree.