如何在Angular 2中更新子组件的父组件

1 回答

• 2

  您无法直接从子组件更新父组件 . 但您可以创建一个可以从任何组件交互到任何其他组件的服务，如下所示 .

  创建一个文件 communication.service.ts

  import { Injectable } from '@angular/core';
  import { Observable } from 'rxjs/Observable';
  import { Subject } from 'rxjs/Subject';
  
  @Injectable()
  export class CommunicationService {
      constructor() { }
  
      private emitChangeSource = new Subject<any>();
  
      changeEmitted$ = this.emitChangeSource.asObservable();
  
      emitChange(data: {}) {
          this.emitChangeSource.next(data);
      }
  
  }
  

  在儿童组件中

  import { Component } from '@angular/core';
  import { CommunicationService } from './communication.service';
  
  @Component({
      templateUrl: `./child.component.html`,
      styles: ['child.component.css']
  })
  export class ChildComponent{
      constructor(private _communicationService: CommunicationService) { }
  
      onSomething() {
          this._communicationService.emitChange({proprty: 'value'});
      }
  }
  

  在父组件中

  import { Component } from '@angular/core';
  import { CommunicationService } from './communication.service';
  
  @Component({
      templateUrl: `./parent.component.html`,
      styles: ['./parent.component.css']
  })
  
  export class ParentComponent {    
      constructor( private _communicationService: CommunicationService ) { 
          _communicationService.changeEmitted$.subscribe(data => {
          // ...
          })
      }
  }
  

  回复于 2024-04-21T00:37:23+08:00