角度:通过路由器出口将数据或事件从子级传递到父级

问题描述

我有一个带路由登录，主页等路由的父级AppComponent.当用户使用凭据登录时，我将用户凭据保存在Sessionstorage中.登录成功后，我想在AppComponent.html的标头中显示部分数据，因此我必须从seesionstorage中获取getItems.如何触发事件以从LoginComponent通知AppComponent?我正在使用路由器插座，所以无法使用EventEmitter.我可以使用BehaviourSubject，但是AppComponent中没有有效的方法可以调用.请提出建议.

I have parent AppComponent with routes login, home etc. When user logs in with creds, I'm saving the user creds in Sessionstorage. When the login is successful I want to display some part of the data in header of AppComponent.html, so I have to getItems from seesionstorage. How do I trigger the event to notify AppComponent from LoginComponent? I'm using router-outlet so I cannot use EventEmitter. I can use BehaviourSubject but there is no valid method in AppComponent to call.Please suggest.

推荐答案

为此使用通讯服务:

CommunicationService.ts

CommunicationService.ts

@Injectable()
export class CommunicationService {
    constructor() { }

    private emitChangeSource = new Subject<any>();

    changeEmitted$ = this.emitChangeSource.asObservable();

    emitChange() {
        this.emitChangeSource.next();
    }
}

login.ts:

constructor(
    private communicationService: CommunicationService
    ) {
   }

   login(){
    this.communicationService.emitChange()
   }

AppComponent.ts:

AppComponent.ts:

constructor(
    private communicationService: CommunicationService,
    ) {
    communicationService.changeEmitted$.subscribe(data => {
      // here fetch data from the session storage
    })
  }

希望这会有所帮助.

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