angular-cn/public/docs/_examples/cb-component-communication/ts/app/missioncontrol.component.ts

// #docregion
import { Component }          from '@angular/core';

import { AstronautComponent } from './astronaut.component';
import { MissionService }     from './mission.service';

@Component({
  selector: 'mission-control',
  template: `
    <h2>Mission Control</h2>
    <button (click)="announce()">Announce mission</button>
    <my-astronaut *ngFor="let astronaut of astronauts"
      [astronaut]="astronaut">
    </my-astronaut>
    <h3>History</h3>
    <ul>
      <li *ngFor="let event of history">{{event}}</li>
    </ul>
  `,
  directives: [AstronautComponent],
  providers: [MissionService]
})
export class MissionControlComponent {
  astronauts = ['Lovell', 'Swigert', 'Haise']
  history: string[] = [];
  missions = ['Fly to the moon!',
              'Fly to mars!',
              'Fly to Vegas!'];
  nextMission = 0;

  constructor(private missionService: MissionService) {
    missionService.missionConfirmed$.subscribe(
      astronaut => {
        this.history.push(`${astronaut} confirmed the mission`);
      })
  }

  announce() {
    let mission = this.missions[this.nextMission++];
    this.missionService.announceMission(mission);
    this.history.push(`Mission "${mission}" announced`);
    if (this.nextMission >= this.missions.length) { this.nextMission = 0; }
  }
}
// #enddocregion