useElementVisibility

Demo

右下角的信息

目标元素（向下滚动）

元素外部视口

用法

vue

<script setup>
import { useElementVisibility } from '@vueuse/core'
import { ref } from 'vue'

const target = ref(null)
const targetIsVisible = useElementVisibility(target)
</script>

<template>
  <div ref="target">
    <h1>Hello world</h1>
  </div>
</template>

组件用法

vue

<template>
  <UseElementVisibility v-slot="{ isVisible }">
    是否可见：{{ isVisible }}
  </UseElementVisibility>
</template>

指令用法

vue

<script setup>
import { vElementVisibility } from '@vueuse/components'
import { ref } from 'vue'

const target = ref(null)
const isVisible = ref(false)

function onElementVisibility(state) {
  isVisible.value = state
}
</script>

<template>
  <div v-element-visibility="onElementVisibility">
    {{ isVisible ? '在内部' : '在外部' }}
  </div>

  <!-- 使用选项 -->
  <div ref="target">
    <div v-element-visibility="[onElementVisibility, { scrollTarget: target }]">
      {{ isVisible ? '在内部' : '在外部' }}
    </div>
  </div>
</template>

类型声明

typescript

export interface UseElementVisibilityOptions
  extends ConfigurableWindow,
    Pick<UseIntersectionObserverOptions, "threshold"> {
  scrollTarget?: MaybeRefOrGetter<HTMLElement | undefined | null>
}
/**
 * 跟踪元素在视口中的可见性
 *
 * @see https://vueuse.org/useElementVisibility
 */
export declare function useElementVisibility(
  element: MaybeComputedElementRef,
  options?: UseElementVisibilityOptions,
): Ref<boolean, boolean>