本文介绍了如何以角度2取消订阅多个订阅者的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有另一个组件的shareService和订阅:
I have shareService and subscribe that is in another components :
import { Component, Input, OnDestroy } from '@angular/core';
import { MissionService } from './mission.service';
import { Subscription } from 'rxjs/Subscription';
@Component({
selector: 'my-astronaut',
template: `
<p>
{{astronaut}}: <strong>{{mission}}</strong>
<button
(click)="confirm()"
[disabled]="!announced || confirmed">
Confirm
</button>
</p>
`
})
export class AstronautComponent implements OnDestroy{
@Input() astronaut: string;
mission = "<no mission announced>";
confirmed = false;
announced = false;
subscription:Subscription;
constructor(private missionService: MissionService) {
this.subscription = missionService.missionAnnounced$.subscribe(
mission => {
this.mission = mission;
this.announced = true;
this.confirmed = false;
})
}
confirm() {
this.confirmed = true;
this.missionService.confirmMission(this.astronaut);
}
ngOnDestroy(){
// prevent memory leak when component destroyed
this.subscription.unsubscribe();
}
}
我想知道我是否有我的构造函数
中的2个订阅者,如何取消订阅ngDestroy中的两个订阅者?
我应该使用 subscription2:订阅;
?和ngDestroy this.subscription2.unsubscribe();
?
这是真的吗?
I want to know if I have 2 subscribers in my constructor
, how to unsubscribe twice subscribers in ngDestroy?I should use subscription2:Subscription;
?and in ngDestroy this.subscription2.unsubscribe();
?this is true?
推荐答案
您可以在数组中的ngOnDestroy()
export class AstronautComponent implements OnDestroy{
@Input() astronaut: string;
mission = "<no mission announced>";
confirmed = false;
announced = false;
subscriptions:Subscription[] = [];
constructor(private missionService: MissionService) {
this.subscriptions.push(missionService.missionAnnounced$.subscribe(
mission => {
this.mission = mission;
this.announced = true;
this.confirmed = false;
}));
this.subscriptions.push(fooService.fooObservable$.subscribe(
...
}));
}
confirm() {
this.confirmed = true;
this.missionService.confirmMission(this.astronaut);
}
ngOnDestroy(){
// prevent memory leak when component destroyed
this.subscriptions.forEach(s => s.unsubscribe());
}
}
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