Question

下面的解决方案不适用于角度路由器。当我调用一个方法时，它正在成功调用一个服务方法，但父内容ieEmployer Component somethingChangedHandler（）没有被执行。

    @Component({
    selector: 'w2',  
     templateUrl: '../../html/views/w2old.html',
     providers:[ListReloadService]
     })

    export class W2Component implements OnInit {

      constructor(private _httpService:HttpService,
   private _router : Router,
     private _activatedRoute :ActivatedRoute,
     private _listReloadService:ListReloadService){

     }

    submitW2()
      {
        this._listReloadService.emitEvent(false); 
       //calling parent somethingChangedHandler()
     } 

    }

    **MySevice**

    @Injectable()
    export class ListReloadService {
    @Output()
     public somethingChanged: EventEmitter<boolean>;

     constructor(private _http: Http){
        this.somethingChanged = new EventEmitter();
     }

     public emitEvent(val: boolean){
        console.log("hello");
        this.somethingChanged.emit(val);
     }
    }

    **parent component**

     @Component({
        selector: 'employerhome',  
       templateUrl: '../../html/views/employerhome.html',
      providers:[ListReloadService]
      })

     export class EmployerHomeComponent  
      {
       constructor(private httpService:HttpService, private        listReloadService : ListReloadService){

         this.listReloadService.somethingChanged
         .subscribe(data=>this.somethingChangedHandler(data));
    }

   private somethingChangedHandler(someVal)
      {
       console.log("hello hi"); 
       }
    }

Answer 1

创建服务，例如：

import {Injectable} from '@angular/core';

@Injectable()
export class HiService {

   sayHi() {
      console.log("Hi!")
   }

}

注入AppComponent：

...
providers: [HiService]
...

在您的组件中使用它：

constructor(private hi: HiService) {
     console.log("constructor")
 }
 ngOnInit(): void {
    this.hi.sayHi()
}

使用路由器插座的angular2组件通信

1 个答案: