useExtractedObservable

使用从一个或多个可组合项中提取的 RxJS Observable，返回 ref，并在卸载组件时自动取消订阅。

¥Use an RxJS Observable as extracted from one or more composables, return a ref, and automatically unsubscribe from it when the component is unmounted.

自动取消订阅可观察到的更改，并在卸载组件时自动取消订阅。

¥Automatically unsubscribe on observable change, and automatically unsubscribe from it when the component is unmounted.

支持与 watch 的所有重载匹配的签名。

¥Supports signatures that match all overloads of watch. Available in the @vueuse/rxjs add-on.

用法

¥Usage

TypeScript

import { computed } from 'vue'
import { useExtractedObservable } from '@vueuse/rxjs'
import ObservableSocket from 'observable-socket'
import { makeSocket, useUser } from '../some/lib/func'

// setup()
const user = useUser()
const lastMessage = useExtractedObservable(user, u => ObservableSocket.create(makeSocket(u.id)).down)

import { useExtractedObservable } from '@vueuse/rxjs'
import ObservableSocket from 'observable-socket'
import { makeSocket, useUser } from '../some/lib/func'
// setup()
const user = useUser()
const lastMessage = useExtractedObservable(
  user,
  (u) => ObservableSocket.create(makeSocket(u.id)).down,
)

如果你想要向可能出错的 Observable 添加自定义错误处理，你可以提供可选的 onError 配置。如果没有这个，RxJS 会将所提供的 Observable 中的任何错误视为 "未处理的错误"，并将其扔到新的调用堆栈中并报告给 window.onerror（如果碰巧在 Node 中，则报告给 process.on('error')）。

¥If you want to add custom error handling to an Observable that might error, you can supply an optional onError configuration. Without this, RxJS will treat any error in the supplied Observable as an "unhandled error" and it will be thrown in a new call stack and reported to window.onerror (or process.on('error') if you happen to be in Node).

import { ref } from 'vue'
import { useExtractedObservable } from '@vueuse/rxjs'
import { interval } from 'rxjs'
import { mapTo, scan, startWith, tap } from 'rxjs/operators'

// setup()
const start = ref(0)

const count = useExtractedObservable(
  start,
  (start) => {
    return interval(1000).pipe(
      mapTo(1),
      startWith(start),
      scan((total, next) => next + total),
      tap((n) => {
        if (n === 10)
          throw new Error('oops')
      })
    )
  },
  {
    onError: (err) => {
      console.log(err.message) // "oops"
    },
  }
)

如果你需要在监视的可观察对象完成时附加特殊行为，你还可以提供可选的 onComplete 配置。

¥You can also supply an optional onComplete configuration if you need to attach special behavior when the watched observable completes.

import { ref } from 'vue'
import { useExtractedObservable } from '@vueuse/rxjs'
import { interval } from 'rxjs'
import { mapTo, scan, startWith, takeWhile } from 'rxjs/operators'

// setup()
const start = ref(0)

const count = useExtractedObservable(
  start,
  (start) => {
    return interval(1000).pipe(
      mapTo(1),
      startWith(start),
      scan((total, next) => next + total),
      takeWhile(num => num < 10)
    )
  },
  {
    onComplete: () => {
      console.log('Done!')
    },
  }
)

如果需要，你还可以传递 watch 选项作为最后一个参数：

¥If you want, you can also pass watch options as the last argument:

TypeScript

import { ref } from 'vue'
import { useExtractedObservable } from '@vueuse/rxjs'
import { interval } from 'rxjs'
import { mapTo, scan, startWith, takeWhile } from 'rxjs/operators'

// setup()
const start = ref<number>()

const count = useExtractedObservable(
  start,
  (start) => {
    return interval(1000).pipe(
      mapTo(1),
      startWith(start),
      scan((total, next) => next + total),
      takeWhile(num => num < 10)
    )
  },
  {},
  {
    immediate: false
  }
)

import { ref } from 'vue'
import { useExtractedObservable } from '@vueuse/rxjs'
import { interval } from 'rxjs'
import { mapTo, scan, startWith, takeWhile } from 'rxjs/operators'
// setup()
const start = ref()
const count = useExtractedObservable(
  start,
  (start) => {
    return interval(1000).pipe(
      mapTo(1),
      startWith(start),
      scan((total, next) => next + total),
      takeWhile((num) => num < 10),
    )
  },
  {},
  {
    immediate: false,
  },
)

类型声明

显示类型声明

export interface UseExtractedObservableOptions<E>
  extends UseObservableOptions<E> {
  onComplete?: () => void
}
export declare function useExtractedObservable<
  T extends MultiWatchSources,
  E,
  Immediate extends Readonly<boolean> = false,
>(
  sources: [...T],
  extractor: WatchExtractedObservableCallback<
    MapSources<T>,
    MapOldSources<T, Immediate>,
    E
  >,
  options?: UseExtractedObservableOptions<E>,
  watchOptions?: WatchOptions<Immediate>,
): Readonly<Ref<E>>
export declare function useExtractedObservable<
  T extends Readonly<MultiWatchSources>,
  E,
  Immediate extends Readonly<boolean> = false,
>(
  sources: T,
  extractor: WatchExtractedObservableCallback<
    MapSources<T>,
    MapOldSources<T, Immediate>,
    E
  >,
  options?: UseExtractedObservableOptions<E>,
  watchOptions?: WatchOptions<Immediate>,
): Readonly<Ref<E>>
export declare function useExtractedObservable<
  T,
  E,
  Immediate extends Readonly<boolean> = false,
>(
  sources: WatchSource<T>,
  extractor: WatchExtractedObservableCallback<
    T,
    Immediate extends true ? T | undefined : T,
    E
  >,
  options?: UseExtractedObservableOptions<E>,
  watchOptions?: WatchOptions<Immediate>,
): Readonly<Ref<E>>
export declare function useExtractedObservable<
  T extends object,
  E,
  Immediate extends Readonly<boolean> = false,
>(
  sources: T,
  extractor: WatchExtractedObservableCallback<
    T,
    Immediate extends true ? T | undefined : T,
    E
  >,
  options?: UseExtractedObservableOptions<E>,
  watchOptions?: WatchOptions<Immediate>,
): Readonly<Ref<E>>

源代码

源代码 • 文档

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