Angular2 Observable BehaviorSubject service not working

Question

I\'m trying to create my own observable service but after i get the initial data from the service, any updates to the service aren\'t propagated to any subscribers. Service

Answer 1

Every time you emit a value, you should create a new object instead of emitting the same mutated object. That will protect you from change detection issues. It'd be better to always assign a new Object to this.keys when you change it though.

this.data.next([...this.keys]);

You can use asObservable() here

public getData(): Observable<number[]> {
  return this.data.asObservable();
}

Also check for what Günter Zöchbauer said. Are you providing the service as a singleton?

Answer 2

I faced the same issue at some point. It's likely the reason is that your service is not a singleton, i.e. that every subscriber gets a new instance. Contrary to Angular 1, in A2 services are not singletons.

If you want to have one instance of the service shared by multiple services/components, put it in providers of your parent @Component or @NgModule.

@NgModule({
  declarations: [],
  imports: [],
  bootstrap: [AppComponent],
  providers: [DataService]
})
export class AppModule {
}