useElementVisibility

Category

Elements

Export Size

735 B

Last Changed

5 days ago

跟踪元素在视口中的可见性。

Demo

source

右下角的信息

目标元素（向下滚动）

元素 外部 视口

用法

<script setup lang="ts">
import { useElementVisibility } from '@vueuse/core'
import { useTemplateRef } from 'vue'

const target = useTemplateRef<HTMLDivElement>('target')
const targetIsVisible = useElementVisibility(target)
</script>

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

rootMargin

如果你希望在元素完全可见之前更早地触发回调，你可以使用 rootMargin 选项（参见 MDN IntersectionObserver/rootMargin）。

const targetIsVisible = useElementVisibility(target, {
  rootMargin: '0px 0px 100px 0px',
})

组件用法

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

指令用法

<script setup lang="ts">
import { vElementVisibility } from '@vueuse/components'
import { shallowRef, useTemplateRef } from 'vue'

const target = useTemplateRef<HTMLDivElement>('target')
const isVisible = shallowRef(false)

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

<template>
  <div v-element-visibility="onElementVisibility">
    {{ isVisible ? '在视口内' : '在视口外' }}
  </div>

  <!-- 带选项 -->
  <div ref="target">
    <div v-element-visibility="[onElementVisibility, { scrollTarget: target }]">
      {{ isVisible ? '在视口内' : '在视口外' }}
    </div>
  </div>
</template>

Type Declarations

export interface UseElementVisibilityOptions
  extends ConfigurableWindow,
    Pick<UseIntersectionObserverOptions, "threshold"> {
  /**
   * @see https://developer.mozilla.org/en-US/docs/Web/API/IntersectionObserver/rootMargin
   */
  rootMargin?: MaybeRefOrGetter<string>
  /**
   * The element that is used as the viewport for checking visibility of the target.
   */
  scrollTarget?: MaybeRefOrGetter<HTMLElement | undefined | null>
  /**
   * Stop tracking when element visibility changes for the first time
   *
   * @default false
   */
  once?: boolean
}
/**
 * Tracks the visibility of an element within the viewport.
 *
 * @see https://vueuse.org/useElementVisibility
 */
export declare function useElementVisibility(
  element: MaybeComputedElementRef,
  options?: UseElementVisibilityOptions,
): ShallowRef<boolean, boolean>

Source

Source • Demo • Docs

Contributors

jorshen

Changelog

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