当 Angular 中的路由改变时结束可观察间隔 [英] End Observable interval when route changes in Angular

问题描述

我在 Angular 组件中开始了一个间隔，但即使在我更改路由之后它仍然不断发出请求.我怎样才能停止间隔?

I start a interval in an Angular component, but it keeps making requests even after I change the route. How can I stop the interval?

//returns an observable
getAllPolls() {
    return Observable.interval(2000).switchMap(() => this._http.get('https://xq4kftam4k.execute-api.us-east-1.amazonaws.com/test/polls2'))
        .map((res: Response) => res.json())

}

推荐答案

您应该保存对 observable 的订阅:

You should save subscription to observable:

this.subscription = getAllPolls().subscribe(...);

并实现 OnDestroy 接口:

And implement OnDestroy interface:

  ngOnDestroy() {
     this.subscription.unsubscribe();
  }

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