Angular2 + RxJS BehaviorSubject 订阅不适用于所有组件 [英] Angular2 + RxJS BehaviorSubject subscription not working on all components
问题描述
我正在尝试在我的组件之间进行某种通信,所以我在组件中使用了一个带有 BehaviorSubject 和 Subscription 的服务,如下所示:
I'm trying to make some sort of communication between my components, so I'm using a service with a BehaviorSubject and Subscription in the components like this:
服务(与问题相关的代码):
Service (code related to the problem):
import { BehaviorSubject } from 'rxjs/BehaviorSubject'
private _clientModalActionSource = new BehaviorSubject<string>('')
modalAction$ = this._clientModalActionSource.asObservable()
public updateClientModalAction(action) {
this._clientModalActionSource.next(action)
console.log('sent')
}
组件A:
this._api.updateClientModalAction(id)
组件B:
import { Subscription } from 'rxjs/subscription'
private _subscription: Subscription
ngOnInit() { this._subscription = this._api.modalAction$.subscribe(res => {
this.refreshModal(res)
console.log('received')
})}
如果组件 B 是组件 A 的子组件,这是完美的工作,但是如果 A 是根组件并且 B 位于其
(或相反)内,则不会收到任何内容对于订阅,我只在控制台中收到 sent
.
This is working perfectly if Component B is child of Component A, but if A is the root component and B is inside its <router-outlet>
(or the opposite) nothing is being received to the subscription, I only get sent
in the console.
我做错了什么?
推荐答案
嗯,问题比我想象的要简单,我没有使用更高级别的服务,我不应该使用 providers: [ApiService]
在每个组件中,而应该只在更高的根组件上.
well the problem was simpler than I thought, I was not using the service on a higher level, I shouldn't have used providers: [ApiService]
in each component, instead it should be only on the higher root component.
我希望这会对某人有所帮助.
I hope this will help someone.
https://github.com/angular/angular/issues/11618#事件-790191142
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