How to trigger function from one component to another in angular2?

angular

Solution

I would probably use a service that uses a `Subject`. This way it can be both published to and subscribed from

import { Subject } from 'rxjs/Subject';

class SomeService {
  private _subject = new Subject<any>();

  newEvent(event) {
    this._subject.next(event);
  }

  get events$ () {
    return this._subject.asObservable();
  }
}

The from your components, one can publish and one can subscribe

@NgModule({
  providers: [ SomeService ]
})
class AppModule {}

@Component()
class ComponentOne {
  constructor(private service: SomeService) {}

  onClick() {
    service.newEvent('clicked!');
  }
}

@Component()
class ComponentTwo {
  constructor(private service: SomeService) {}

  ngOnInit() {
    this.service.events$.forEach(event => console.log(event));
  }
}

See also:

- Getting Started on Subjects

Problem

I have two components componentA and componentB. Both of them are sibblings, and are children of componentMother. I want to make it such that when I click on a button on componentA, it triggers a function call on componentB. Is the way to do this using a service with an observable and having componentA emit events that componentB subscribes to or is there a better/best practice way?

Original source

Related problems