watchExtractedObservable

类别

@RxJS

导出大小

264 B

包

@vueuse/rxjs

最后更改

4 个月前

监视从一个或多个组合项中提取的 RxJS Observable 的值。

在 observable 更改时自动取消订阅，并在组件卸载时自动取消订阅。

支持 watch 的所有重载。在 @vueuse/rxjs 附加组件中可用。

用法

TypeScript

import { watchExtractedObservable } from '@vueuse/rxjs'
import { computed, reactive, shallowRef } from 'vue'
import { AudioPlayer } from '../my/libs/AudioPlayer'

// setup()

const audio = shallowRef<HTMLAudioElement>()
const player = computed(() => (audio.value ? new AudioPlayer(audio) : null))
const state = reactive({
  progress: 0,
})

watchExtractedObservable(player, p => p.progress$, (percentage) => {
  state.progress = percentage * 100
})

import { watchExtractedObservable } from '@vueuse/rxjs'
import { computed, reactive, shallowRef } from 'vue'
import { AudioPlayer } from '../my/libs/AudioPlayer'
// setup()
const audio = shallowRef()
const player = computed(() => (audio.value ? new AudioPlayer(audio) : null))
const state = reactive({
  progress: 0,
})
watchExtractedObservable(
  player,
  (p) => p.progress$,
  (percentage) => {
    state.progress = percentage * 100
  },
)

如果您想为可能出错的 Observable 添加自定义错误处理，您可以提供可选的 onError 配置。如果没有这个，RxJS 会将提供的 Observable 中的任何错误视为“未处理的错误”，它将在新的调用堆栈中抛出并报告给 window.onerror (如果您碰巧在 Node 中，则报告给 process.on('error'))。

如果您需要在监视的 observable 完成时附加特殊行为，您还可以提供可选的 onComplete 配置。

TypeScript

import { watchExtractedObservable } from '@vueuse/rxjs'
import { computed, reactive, shallowRef } from 'vue'
import { AudioPlayer } from '../my/libs/AudioPlayer'

// setup()

const audio = shallowRef<HTMLAudioElement>()
const player = computed(() => (audio.value ? new AudioPlayer(audio) : null))
const state = reactive({
  progress: 0,
})

watchExtractedObservable(player, p => p.progress$, (percentage) => {
  state.progress = percentage * 100
}, {
  onError: (err: unknown) => {
    console.error(err)
  },
  onComplete: () => {
    state.progress = 100 // or 0, or whatever
  },
})

import { watchExtractedObservable } from '@vueuse/rxjs'
import { computed, reactive, shallowRef } from 'vue'
import { AudioPlayer } from '../my/libs/AudioPlayer'
// setup()
const audio = shallowRef()
const player = computed(() => (audio.value ? new AudioPlayer(audio) : null))
const state = reactive({
  progress: 0,
})
watchExtractedObservable(
  player,
  (p) => p.progress$,
  (percentage) => {
    state.progress = percentage * 100
  },
  {
    onError: (err) => {
      console.error(err)
    },
    onComplete: () => {
      state.progress = 100 // or 0, or whatever
    },
  },
)

如果需要，您也可以将 watch 选项作为最后一个参数传递

TypeScript

import { watchExtractedObservable } from '@vueuse/rxjs'
import { computed, reactive, shallowRef } from 'vue'
import { AudioPlayer } from '../my/libs/AudioPlayer'

// setup()

const audio = shallowRef<HTMLAudioElement>()
const player = computed(() => (audio.value ? new AudioPlayer(audio) : null))
const state = reactive({
  progress: 0,
})

watchExtractedObservable(player, p => p.progress$, (percentage) => {
  state.progress = percentage * 100
}, {
  onError: (err: unknown) => {
    console.error(err)
  }
}, {
  immediate: true
})

import { watchExtractedObservable } from '@vueuse/rxjs'
import { computed, reactive, shallowRef } from 'vue'
import { AudioPlayer } from '../my/libs/AudioPlayer'
// setup()
const audio = shallowRef()
const player = computed(() => (audio.value ? new AudioPlayer(audio) : null))
const state = reactive({
  progress: 0,
})
watchExtractedObservable(
  player,
  (p) => p.progress$,
  (percentage) => {
    state.progress = percentage * 100
  },
  {
    onError: (err) => {
      console.error(err)
    },
  },
  {
    immediate: true,
  },
)

类型声明

显示类型声明

typescript

export type OnCleanup = (cleanupFn: () => void) => void
export type WatchExtractedObservableCallback<
  Value,
  OldValue,
  ObservableElement,
> = (
  value: NonNullable<Value>,
  oldValue: OldValue,
  onCleanup: OnCleanup,
) => Observable<ObservableElement>
export interface WatchExtractedObservableOptions {
  onError?: (err: unknown) => void
  onComplete?: () => void
}
export declare function watchExtractedObservable<
  T extends MultiWatchSources,
  E,
  Immediate extends Readonly<boolean> = false,
>(
  sources: [...T],
  extractor: WatchExtractedObservableCallback<
    MapSources<T>,
    MapOldSources<T, Immediate>,
    E
  >,
  callback: (snapshot: E) => void,
  subscriptionOptions?: WatchExtractedObservableOptions,
  watchOptions?: WatchOptions<Immediate>,
): WatchStopHandle
export declare function watchExtractedObservable<
  T extends Readonly<MultiWatchSources>,
  E,
  Immediate extends Readonly<boolean> = false,
>(
  source: T,
  extractor: WatchExtractedObservableCallback<
    MapSources<T>,
    MapOldSources<T, Immediate>,
    E
  >,
  callback: (snapshot: E) => void,
  subscriptionOptions?: WatchExtractedObservableOptions,
  watchOptions?: WatchOptions<Immediate>,
): WatchStopHandle
export declare function watchExtractedObservable<
  T,
  E,
  Immediate extends Readonly<boolean> = false,
>(
  source: WatchSource<T>,
  extractor: WatchExtractedObservableCallback<
    T,
    Immediate extends true ? T | undefined : T,
    E
  >,
  callback: (snapshot: E) => void,
  subscriptionOptions?: WatchExtractedObservableOptions,
  watchOptions?: WatchOptions<Immediate>,
): WatchStopHandle
export declare function watchExtractedObservable<
  T extends object,
  E,
  Immediate extends Readonly<boolean> = false,
>(
  source: T,
  extractor: WatchExtractedObservableCallback<
    T,
    Immediate extends true ? T | undefined : T,
    E
  >,
  callback: (snapshot: E) => void,
  subscriptionOptions?: WatchExtractedObservableOptions,
  watchOptions?: WatchOptions<Immediate>,
): WatchStopHandle