useEventListener

類別

導出大小

514 B

最後更改

5 天前

輕鬆使用 EventListener。在 mounted 時使用 addEventListener 註冊，並在 unmounted 時自動 removeEventListener。

用法

import { useEventListener } from '@vueuse/core'

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

您也可以傳遞 ref 作為事件目標，useEventListener 將在您更改目標時取消註冊先前的事件並註冊新的事件。

TypeScript

import { useEventListener } from '@vueuse/core'
import { useTemplateRef } from 'vue'

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

import { useEventListener } from '@vueuse/core'
import { useTemplateRef } from 'vue'
const element = useTemplateRef('element')
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>

您也可以調用返回的函數來取消註冊監聽器。

import { useEventListener } from '@vueuse/core'

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

cleanup() // This will unregister the listener.

請注意，如果您的組件也在 SSR（伺服器端渲染）中運行，您可能會收到錯誤（例如 document is not defined），因為像 document 和 window 這樣的 DOM API 在 Node.js 中不可用。為了避免這種情況，您可以將邏輯放在 onMounted 鉤子中。

// 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)
  })
})

類型宣告

顯示類型宣告

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.dev.org.tw/useEventListener
 * @param event
 * @param listener
 * @param options
 */
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.dev.org.tw/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.dev.org.tw/useEventListener
 * @param target
 * @param event
 * @param listener
 * @param options
 */
export declare function useEventListener<E extends keyof DocumentEventMap>(
  target: DocumentOrShadowRoot,
  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 HTMLElement target
 *
 * @see https://vueuse.dev.org.tw/useEventListener
 * @param target
 * @param event
 * @param listener
 * @param options
 */
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>,
): () => void
/**
 * Register using addEventListener on mounted, and removeEventListener automatically on unmounted.
 *
 * Overload 5: Custom event target with event type infer
 *
 * @see https://vueuse.dev.org.tw/useEventListener
 * @param target
 * @param event
 * @param listener
 * @param options
 */
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 6: Custom event target fallback
 *
 * @see https://vueuse.dev.org.tw/useEventListener
 * @param target
 * @param event
 * @param listener
 * @param options
 */
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