VueUse中文文档useFocusWithin
用于跟踪元素或其后代之一是否获取了焦点的响应式工具。匹配 :focus-within 伪类的行为。一个常见的用例是在表单元素上查看整个表单是否获取了焦点。
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.
例子
Focus in form: false
Basic Usage
html
<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>
<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>
<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>
Type Declarations
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.org/useFocusWithin
* @param target The target element to track
* @param options Focus within options
*/
export declare function useFocusWithin(
target: MaybeElementRef,
options?: ConfigurableWindow
): UseFocusWithinReturn
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.org/useFocusWithin
* @param target The target element to track
* @param options Focus within options
*/
export declare function useFocusWithin(
target: MaybeElementRef,
options?: ConfigurableWindow
): UseFocusWithinReturn