VueUse
💡 Click somewhere outside of the document to unfocus.

useWindowFocus

Reactively track window focus with window.onfocus and window.onblur events.

Usage 

import { useWindowFocus } from '@vueuse/core'

const focused = useWindowFocus()

Component 

<UseWindowFocus v-slot="{ focused }">
  Document Focus: {{ focused }}
</UseWindowFocus>

Type Declarations 

/**
 * Reactively track window focus with `window.onfocus` and `window.onblur`.
 *
 * @see https://vueuse.org/useWindowFocus
 * @param options
 */
export declare function useWindowFocus({
  window,
}?: ConfigurableWindow): Ref<boolean>

Source

Source • Demo • Docs