useEventListener

Usage

import { useEventListener } from '@vueuse/core'

useEventListener(document, 'visibilitychange', (evt) => {
  console.log(evt)
})

You can also pass a ref as the event target, useEventListener will unregister the previous event and register the new one when you change the target.

TypeScript

import { useEventListener } from '@vueuse/core'

const element = ref<HTMLDivElement>()
useEventListener(element, 'keydown', (e) => {
  console.log(e.key)
})

import { useEventListener } from '@vueuse/core'
const element = ref()
useEventListener(element, 'keydown', (e) => {
  console.log(e.key)
})

vue

<template>
  <div v-if="cond" ref="element">
    Div1
  </div>
  <div v-else ref="element">
    Div2
  </div>
</template>

You can also call the returned to unregister the listener.

import { useEventListener } from '@vueuse/core'

const cleanup = useEventListener(document, 'keydown', (e) => {
  console.log(e.key)
})

cleanup() // This will unregister the listener.

Note if your components also run in SSR (Server Side Rendering), you might get errors (like document is not defined) because DOM APIs like document and window are not available in Node.js. To avoid that you can put the logic inside onMounted hook.

// onMounted will only be called in the client side, so it guarantees the DOM APIs are available.
onMounted(() => {
  useEventListener(document, 'keydown', (e) => {
    console.log(e.key)
  })
})

Type Declarations

Show Type Declarations

typescript

interface InferEventTarget<Events> {
  addEventListener: (event: Events, fn?: any, options?: any) => any
  removeEventListener: (event: Events, fn?: any, options?: any) => any
}
export type WindowEventName = keyof WindowEventMap
export type DocumentEventName = keyof DocumentEventMap
export interface GeneralEventListener<E = Event> {
  (evt: E): void
}
/**
 * Register using addEventListener on mounted, and removeEventListener automatically on unmounted.
 *
 * Overload 1: Omitted Window target
 *
 * @see https://vueuse.org/useEventListener
 * @param event
 * @param listener
 * @param options
 */
export declare function useEventListener<E extends keyof WindowEventMap>(
  event: Arrayable<E>,
  listener: Arrayable<(this: Window, ev: WindowEventMap[E]) => any>,
  options?: MaybeRefOrGetter<boolean | AddEventListenerOptions>,
): Fn
/**
 * Register using addEventListener on mounted, and removeEventListener automatically on unmounted.
 *
 * Overload 2: Explicitly Window target
 *
 * @see https://vueuse.org/useEventListener
 * @param target
 * @param event
 * @param listener
 * @param options
 */
export declare function useEventListener<E extends keyof WindowEventMap>(
  target: Window,
  event: Arrayable<E>,
  listener: Arrayable<(this: Window, ev: WindowEventMap[E]) => any>,
  options?: MaybeRefOrGetter<boolean | AddEventListenerOptions>,
): Fn
/**
 * Register using addEventListener on mounted, and removeEventListener automatically on unmounted.
 *
 * Overload 3: Explicitly Document target
 *
 * @see https://vueuse.org/useEventListener
 * @param target
 * @param event
 * @param listener
 * @param options
 */
export declare function useEventListener<E extends keyof DocumentEventMap>(
  target: DocumentOrShadowRoot,
  event: Arrayable<E>,
  listener: Arrayable<(this: Document, ev: DocumentEventMap[E]) => any>,
  options?: MaybeRefOrGetter<boolean | AddEventListenerOptions>,
): Fn
/**
 * Register using addEventListener on mounted, and removeEventListener automatically on unmounted.
 *
 * Overload 4: Explicitly HTMLElement target
 *
 * @see https://vueuse.org/useEventListener
 * @param target
 * @param event
 * @param listener
 * @param options
 */
export declare function useEventListener<E extends keyof HTMLElementEventMap>(
  target: MaybeRefOrGetter<HTMLElement | null | undefined>,
  event: Arrayable<E>,
  listener: (this: HTMLElement, ev: HTMLElementEventMap[E]) => any,
  options?: boolean | AddEventListenerOptions,
): () => void
/**
 * Register using addEventListener on mounted, and removeEventListener automatically on unmounted.
 *
 * Overload 5: Custom event target with event type infer
 *
 * @see https://vueuse.org/useEventListener
 * @param target
 * @param event
 * @param listener
 * @param options
 */
export declare function useEventListener<
  Names extends string,
  EventType = Event,
>(
  target: InferEventTarget<Names>,
  event: Arrayable<Names>,
  listener: Arrayable<GeneralEventListener<EventType>>,
  options?: MaybeRefOrGetter<boolean | AddEventListenerOptions>,
): Fn
/**
 * Register using addEventListener on mounted, and removeEventListener automatically on unmounted.
 *
 * Overload 6: Custom event target fallback
 *
 * @see https://vueuse.org/useEventListener
 * @param target
 * @param event
 * @param listener
 * @param options
 */
export declare function useEventListener<EventType = Event>(
  target: MaybeRefOrGetter<EventTarget | null | undefined>,
  event: Arrayable<string>,
  listener: Arrayable<GeneralEventListener<EventType>>,
  options?: MaybeRefOrGetter<boolean | AddEventListenerOptions>,
): Fn