Angular 2 Component Communication Amongst Siblings
In Angular 2, sibling component communication can be achieved through dependency injection and shared services.
Shared Service Approach (Angular 2 RC4 and Later)
The recommended approach involves creating a shared service that sibling components can access via dependency injection. Here's an example:
// shared.service.ts
@Injectable()
export class SharedService {
dataArray: string[] = [];
insertData(data: string) {
this.dataArray.unshift(data);
}
}
Parent Component:
// parent.component.ts
@Component({
providers: [SharedService],
directives: [ChildComponent, ChildSiblingComponent]
})
export class parentComponent { }
Sibling Components:
// child.component.ts
constructor(private _sharedService: SharedService) { }
ngOnInit(): void {
this.data = this._sharedService.dataArray;
}
// child-sibling.component.ts
constructor(private _sharedService: SharedService) {}
addData() {
this._sharedService.insertData(this.data);
this.data = '';
}
Benefits of this Method:
- Simple to implement
- Supports direct communication between sibling components without the need for an event emitter or $rootScope.$broadcast
- Allows for sharing of data between multiple components
Note:
- Provide the service in the parent component only, but import it in both child components.
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