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Add comprehensive reference documentation for: - Vitest: environments, projects/workspaces, type testing, vi utilities - Pinia: HMR, Nuxt integration, SSR setup - Vue: built-in components (Transition, Teleport, Suspense, KeepAlive) and advanced directives
87 lines
2.0 KiB
Markdown
87 lines
2.0 KiB
Markdown
---
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category: Elements
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---
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# useActiveElement
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Reactive `document.activeElement`. Returns a shallow ref that updates when focus changes.
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## Usage
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```vue
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<script setup lang="ts">
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import { useActiveElement } from '@vueuse/core'
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import { watch } from 'vue'
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const activeElement = useActiveElement()
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watch(activeElement, (el) => {
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console.log('focus changed to', el)
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})
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</script>
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```
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### Shadow DOM Support
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By default, `useActiveElement` will traverse into shadow DOM to find the deeply active element. Set `deep: false` to disable this behavior.
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```ts
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import { useActiveElement } from '@vueuse/core'
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// Only get the shadow host, not the element inside shadow DOM
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const activeElement = useActiveElement({ deep: false })
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```
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### Track Element Removal
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Set `triggerOnRemoval: true` to update the active element when the currently active element is removed from the DOM. This uses a `MutationObserver` under the hood.
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```ts
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import { useActiveElement } from '@vueuse/core'
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const activeElement = useActiveElement({ triggerOnRemoval: true })
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```
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## Component Usage
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```vue
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<template>
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<UseActiveElement v-slot="{ element }">
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Active element is {{ element?.dataset.id }}
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</UseActiveElement>
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</template>
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```
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## Type Declarations
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```ts
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export interface UseActiveElementOptions
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extends ConfigurableWindow, ConfigurableDocumentOrShadowRoot {
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/**
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* Search active element deeply inside shadow dom
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*
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* @default true
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*/
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deep?: boolean
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/**
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* Track active element when it's removed from the DOM
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* Using a MutationObserver under the hood
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* @default false
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*/
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triggerOnRemoval?: boolean
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}
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export type UseActiveElementReturn<T extends HTMLElement = HTMLElement> =
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ShallowRef<T | null | undefined>
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/**
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* Reactive `document.activeElement`
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*
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* @see https://vueuse.org/useActiveElement
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* @param options
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*
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* @__NO_SIDE_EFFECTS__
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*/
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export declare function useActiveElement<T extends HTMLElement>(
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options?: UseActiveElementOptions,
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): UseActiveElementReturn<T>
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```
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