How Can I Facilitate Communication Between Sibling Components in Angular 2?

Sibling Component Communication in Angular 2

Angular 2 has introduced significant changes in component interaction, and passing data between sibling components can be a concern. Here are some viable solutions:

Using a Shared Service

One recommended approach is to utilize a shared service. This service can act as a medium for data exchange between components without direct access to each other. Here's an example:

// SharedService
@Injectable()
export class SharedService {
  dataArray: string[] = [];

  insertData(data: string) {
    this.dataArray.unshift(data);
  }
}

// ParentComponent
import {SharedService} from './shared.service';

@Component({
  providers: [SharedService],
})
export class ParentComponent {}

// ChildComponent
import {SharedService} from './shared.service';

@Component()
export class ChildComponent {
  data: string[] = [];

  constructor(private _sharedService: SharedService) {}

  ngOnInit() {
    this.data = this._sharedService.dataArray;
  }
}

// ChildSiblingComponent
import {SharedService} from './shared.service';

@Component()
export class ChildSiblingComponent {
  data: string = 'Testing data';

  constructor(private _sharedService: SharedService) {}

  addData() {
    this._sharedService.insertData(this.data);
    this.data = '';
  }
}

By injecting the SharedService into both child components, they gain access to a common data structure where they can exchange information. This method can also facilitate more complex interactions, allowing multiple components to subscribe to changes in the shared data.

Note:

• Include the shared service provider only in the parent component.
• Inject the service and its dependencies into all necessary components.
• Ensure type safety by using proper interfaces or static typing.

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