useFocusWithin

用于跟踪元素或其后代之一是否具有焦点的反应式工具。它旨在匹配 :focus-within CSS 伪类的行为。一个常见的用例是在表单元素上查看当前是否有任何输入具有焦点。

¥Reactive utility to track if an element or one of its decendants has focus. It is meant to match the behavior of the :focus-within CSS pseudo-class. A common use case would be on a form element to see if any of its inputs currently have focus.

示例

源代码演练场

Focus in form: false

基本用法

¥Basic Usage

<script setup lang="ts">
import { useFocusWithin } from '@vueuse/core'
import { ref, watch } from 'vue'

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>