f5792c40be
Pulled ALL skills from 15 source repositories: - anthropics/skills: 16 (docs, design, MCP, testing) - obra/superpowers: 14 (TDD, debugging, agents, planning) - coreyhaines31/marketingskills: 25 (marketing, CRO, SEO, growth) - better-auth/skills: 5 (auth patterns) - vercel-labs/agent-skills: 5 (React, design, Vercel) - antfu/skills: 16 (Vue, Vite, Vitest, pnpm, Turborepo) - Plus 13 individual skills from various repos Mosaic Stack is not limited to coding — the Orchestrator and subagents serve coding, business, design, marketing, writing, logistics, analysis, and more. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
119 lines
2.6 KiB
Markdown
119 lines
2.6 KiB
Markdown
---
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category: Elements
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---
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# useIntersectionObserver
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Detects that a target element's visibility.
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## Usage
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```vue
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<script setup lang="ts">
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import { useIntersectionObserver } from '@vueuse/core'
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import { shallowRef, useTemplateRef } from 'vue'
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const target = useTemplateRef('target')
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const targetIsVisible = shallowRef(false)
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const { stop } = useIntersectionObserver(
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target,
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([entry], observerElement) => {
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targetIsVisible.value = entry?.isIntersecting || false
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},
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)
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</script>
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<template>
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<div ref="target">
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<h1>Hello world</h1>
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</div>
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</template>
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```
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## Directive Usage
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```vue
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<script setup lang="ts">
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import { vIntersectionObserver } from '@vueuse/components'
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import { shallowRef, useTemplateRef } from 'vue'
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const root = useTemplateRef('root')
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const isVisible = shallowRef(false)
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function onIntersectionObserver([entry]: IntersectionObserverEntry[]) {
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isVisible.value = entry?.isIntersecting || false
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}
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</script>
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<template>
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<div>
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<p>
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Scroll me down!
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</p>
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<div v-intersection-observer="onIntersectionObserver">
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<p>Hello world!</p>
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</div>
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</div>
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<!-- with options -->
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<div ref="root">
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<p>
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Scroll me down!
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</p>
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<div v-intersection-observer="[onIntersectionObserver, { root }]">
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<p>Hello world!</p>
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</div>
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</div>
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</template>
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```
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[IntersectionObserver MDN](https://developer.mozilla.org/en-US/docs/Web/API/IntersectionObserver/IntersectionObserver)
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## Type Declarations
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```ts
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export interface UseIntersectionObserverOptions extends ConfigurableWindow {
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/**
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* Start the IntersectionObserver immediately on creation
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*
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* @default true
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*/
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immediate?: boolean
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/**
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* The Element or Document whose bounds are used as the bounding box when testing for intersection.
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*/
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root?: MaybeComputedElementRef | Document
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/**
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* A string which specifies a set of offsets to add to the root's bounding_box when calculating intersections.
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*/
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rootMargin?: string
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/**
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* Either a single number or an array of numbers between 0.0 and 1.
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* @default 0
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*/
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threshold?: number | number[]
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}
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export interface UseIntersectionObserverReturn extends Pausable {
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isSupported: ComputedRef<boolean>
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stop: () => void
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}
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/**
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* Detects that a target element's visibility.
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*
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* @see https://vueuse.org/useIntersectionObserver
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* @param target
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* @param callback
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* @param options
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*/
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export declare function useIntersectionObserver(
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target:
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| MaybeComputedElementRef
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| MaybeRefOrGetter<MaybeElement[]>
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| MaybeComputedElementRef[],
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callback: IntersectionObserverCallback,
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options?: UseIntersectionObserverOptions,
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): UseIntersectionObserverReturn
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```
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