Angular2創建地圖訂閱

Question

我想要一個Angular2自定義事件。 如何調用訂閱事件？

BoardComponent.ts

onClickDelete() {

    this.popupService.yesno("...?").subscribe(
        yes => {
        console.log("E");
        },
        no => {
        console.log("error")
        }
    );
}

PopupService.ts

yesno(message: string):Observable<any> {
        this.subject.next({ type: 'yesno', text: message });
        let obj:Observable<any> = new Observable();

        //How to..? /////////////////////////////
        return obj.map(() => { return {yes:'2'}; });
    }

Answer 1

為此，您可以使用ReplaySubject。

服務內容：

import { Injectable } from '@angular/core';
import { Observable, Subject, ReplaySubject } from 'rxjs';

@Injectable()
export class EventSubscribeService {

  private eventSubject: Subject<any> = new ReplaySubject(1);

  constructor() { }

// set observable of this subject
  get $getEventSubject(): Observable<any> {
    return this.eventSubject.asObservable();
  }
// remove from observer
  resetEventObserver(): void {
    this.eventSubject = new ReplaySubject(1);
  }
// send event to observers
  sendCustomEvent(param):void {
    this.eventSubject.next(param); // you can send any parameter through here.
  }

}

和組件：

 constructor(
      private serviceInstance: EventSubscribeService,
  ) {
//event will receive parameter.
    this.serviceInstance.$getEventSubject.subscribe(event => {
      // here you can do anything what you are going to do
    });
  }

如何制作活動？

onCustomEvent(param:any):void {
    this.serviceInstance.sendCustomEvent(param);
  }