useEventListener

类别

Browser

导出体积

532 B

上次更改

6 minutes ago

轻松使用 EventListener。在组件挂载时使用 addEventListener 进行注册，在组件卸载时自动使用 removeEventListener 进行注销。

用法

import { useEventListener } from '@vueuse/core'

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

默认目标

当省略目标时，默认使用 window：

import { useEventListener } from '@vueuse/core'

// 监听 window 的事件
useEventListener('resize', (evt) => {
  console.log(evt)
})

响应式目标

你可以将一个 ref 作为事件目标传递给 useEventListener，当你改变目标时，useEventListener 会注销之前的事件并注册新的事件。

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

const element = useTemplateRef('element')
useEventListener(element, 'keydown', (e) => {
  console.log(e.key)
})
</script>

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

多个事件

你可以传入一个事件数组，同时监听多个事件：

import { useEventListener } from '@vueuse/core'

useEventListener(document, ['mouseenter', 'mouseleave'], (evt) => {
  console.log(evt.type)
})

多个目标

你也可以传入多个目标的数组：

import { useEventListener } from '@vueuse/core'

const buttons = document.querySelectorAll('button')
useEventListener(buttons, 'click', (evt) => {
  console.log('Button clicked')
})

清理

返回一个清理函数，可以手动注销监听器：

import { useEventListener } from '@vueuse/core'

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

cleanup() // 这将注销监听器。

注意，如果你的组件也在 SSR（服务器端渲染）中运行，你可能会遇到错误（如 document is not defined），因为类似 document 和 window 的 DOM API 在 Node.js 中不可用。为了避免这种情况，你可以将逻辑放在 onMounted 钩子内部。

// onMounted 只会在客户端调用
// 因此可以保证 DOM API 可用。
onMounted(() => {
  useEventListener(document, 'keydown', (e) => {
    console.log(e.key)
  })
})

类型声明

显示类型声明

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 type ShadowRootEventName = keyof ShadowRootEventMap
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
 */
export declare function useEventListener<E extends keyof WindowEventMap>(
  event: MaybeRefOrGetter<Arrayable<E>>,
  listener: MaybeRef<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: MaybeRefOrGetter<Arrayable<E>>,
  listener: MaybeRef<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
 */
export declare function useEventListener<E extends keyof DocumentEventMap>(
  target: Document,
  event: MaybeRefOrGetter<Arrayable<E>>,
  listener: MaybeRef<
    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 ShadowRoot target
 *
 * @see https://vueuse.org/useEventListener
 */
export declare function useEventListener<E extends keyof ShadowRootEventMap>(
  target: MaybeRefOrGetter<Arrayable<ShadowRoot> | null | undefined>,
  event: MaybeRefOrGetter<Arrayable<E>>,
  listener: MaybeRef<
    Arrayable<(this: ShadowRoot, ev: ShadowRootEventMap[E]) => any>
  >,
  options?: MaybeRefOrGetter<boolean | AddEventListenerOptions>,
): Fn
/**
 * Register using addEventListener on mounted, and removeEventListener automatically on unmounted.
 *
 * Overload 5: Explicitly HTMLElement target
 *
 * @see https://vueuse.org/useEventListener
 */
export declare function useEventListener<E extends keyof HTMLElementEventMap>(
  target: MaybeRefOrGetter<Arrayable<HTMLElement> | null | undefined>,
  event: MaybeRefOrGetter<Arrayable<E>>,
  listener: MaybeRef<(this: HTMLElement, ev: HTMLElementEventMap[E]) => any>,
  options?: MaybeRefOrGetter<boolean | AddEventListenerOptions>,
): Fn
/**
 * Register using addEventListener on mounted, and removeEventListener automatically on unmounted.
 *
 * Overload 6: Custom event target with event type infer
 *
 * @see https://vueuse.org/useEventListener
 */
export declare function useEventListener<
  Names extends string,
  EventType = Event,
>(
  target: MaybeRefOrGetter<
    Arrayable<InferEventTarget<Names>> | null | undefined
  >,
  event: MaybeRefOrGetter<Arrayable<Names>>,
  listener: MaybeRef<Arrayable<GeneralEventListener<EventType>>>,
  options?: MaybeRefOrGetter<boolean | AddEventListenerOptions>,
): Fn
/**
 * Register using addEventListener on mounted, and removeEventListener automatically on unmounted.
 *
 * Overload 7: Custom event target fallback
 *
 * @see https://vueuse.org/useEventListener
 */
export declare function useEventListener<EventType = Event>(
  target: MaybeRefOrGetter<Arrayable<EventTarget> | null | undefined>,
  event: MaybeRefOrGetter<Arrayable<string>>,
  listener: MaybeRef<Arrayable<GeneralEventListener<EventType>>>,
  options?: MaybeRefOrGetter<boolean | AddEventListenerOptions>,
): Fn

源码

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