Question

我有一个场景需要在两个组件之间传递数据请找到组件树的以下场景。

     A
    / \
   B   C
  / \ / \
 D  E F  G

这里我需要将数据从G组件传递到同一屏幕上的B组件

服务

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

@Injectable()
export class myCommService {
  private activeTabIndex = new Subject<number>();
  public activeTabIndexs = new Subject<number>();
  activeTab$ = this.activeTabIndex.asObservable();
  selectedCount$=this.activeTabIndexs.asObservable();
  constructor() { }
  fnActiveTabIs(astronaut: number) {
    debugger
    this.activeTabIndex.next(astronaut);
  }
  fnSelected(astronauts: number) {
    debugger
    this.activeTabIndexs.next(astronauts);
  }
}

G分量：

import { Component, OnInit, Input } from '@angular/core';
import { myCommService} from '../../../../shared/services/comm.service';
@Component({
  selector: 'app-bl-view-widget-menu',
  templateUrl: './bl-view-widget-menu.component.html',
  styleUrls: ['./bl-view-widget-menu.component.css'],
  inputs: ['id'],
  providers: [myCommService]
})
export class BlViewWidgetMenuComponent implements OnInit {

  isToggle: boolean = true;
  i = 1;
  constructor(private myCommService: myCommService) { }
  id: Number;
  ngOnInit() {

  }

  fn(data, id) {
    debugger
    this.i = this.i + 1;
    // alert(this.i);
    this.myCommService.fnSelected(1);
  }

}

B组件：“

import { Component, OnInit } from '@angular/core';
import { Subscription } from 'rxjs/Subscription';
import { myCommService} from '../../shared/services/comm.service';

@Component({
  // moduleId: module.id,
  selector: 'app-bl-filter',
  templateUrl: 'bl-filter.component.html',
  styleUrls: ['bl-filter.component.css'],
  providers: [myCommService]
})
export class BlFilterComponent implements OnInit {
  showInfo: boolean = true;
  activeTabIndex;
  a;
  constructor(
    private myCommService: myCommService
  ) {
    debugger
     myCommService.selectedCount$.subscribe(
       astronauts => {
         this.a = astronauts;
       });


  }

  ngOnInit() {
  }


}

但是在这里我能够更新服务日期但是在B组件中我无法从服务中获取该数据。没有错误，实际上我无法调试。任何帮助将不胜感激。

Answer 1

这是因为服务是每个提供商的单身人士

由于您要为G和B组件注入不同的服务实例，因此您无法实现此目标。

您需要在像

这样的通用模块中提供服务

@NgModule({
    imports: [],
    exports: [],
    declarations: [Gcomponent, BComponent], // <-- components declared in same module
    providers: [myCommService], // <--- service provided here
})

组件之间无法通信（Angular 2）

1 个答案: