Tips for transferring observable to parent component in angular 2?

I have two components, SearchComponent and RuleListComponent. The Search component is a child of RuleList.

https://i.stack.imgur.com/rFlM2.png

I need the SearchComponent to retrieve data using APIService. This data should then be passed to RuleList as an observable.

SearchComponent:

export class SearchComponent implements OnInit {
  items: Observable<Array<string>>;
  term = new FormControl(); # term is asynchronous

  constructor(private apiService: APIService) { }

  ngOnInit() {
    this.items = this.term.valueChanges
      .debounceTime(1000)
      .distinctUntilChanged()
      .switchMap(term => this.apiService.fetch('rule', term));
  }
}

APIService:

@Injectable()
export class APIService {
  baseUrl: string;

  constructor(private http: Http) {
    this.baseUrl = '//127.0.0.1:8000/';
  }

  fetch(term: string) : Observable<any> {
    console.log('searching');
    var search = new URLSearchParams();
    search.set('search', term);
    return this.http.get(this.baseUrl, { search })
                    .map(response => response.json());
  }
}

Is there a way to continuously pass data from SearchComponent to RuleListComponent based on changing terms asynchronously?

Answer №1

A great suggestion is to create a separate `SearchService` and have both the `RuleListComponent` and `SearchComponent` depend on this service.

It would be ideal for the `SearchService` to also rely on the `ApiService` and handle setting the items internally rather than in the component itself. It's best practice to avoid storing data directly within components.

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