useFocusWithin

Demo

表單中的焦點：false

基本用法

vue

<script>
import { useFocusWithin } from '@vueuse/core'

const target = ref()
const { focused } = useFocusWithin(target)

watch(focused, (focused) => {
  if (focused)
    console.log('Target contains the focused element')
  else console.log('Target does NOT contain the focused element')
})
</script>

<template>
  <form ref="target">
    <input type="text" placeholder="First Name">
    <input type="text" placeholder="Last Name">
    <input type="text" placeholder="Email">
    <input type="text" placeholder="Password">
  </form>
</template>

類型宣告

typescript

export interface UseFocusWithinReturn {
  /**
   * True if the element or any of its descendants are focused
   */
  focused: ComputedRef<boolean>
}
/**
 * Track if focus is contained within the target element
 *
 * @see https://vueuse.dev.org.tw/useFocusWithin
 * @param target The target element to track
 * @param options Focus within options
 */
export declare function useFocusWithin(
  target: MaybeElementRef,
  options?: ConfigurableWindow,
): UseFocusWithinReturn