How to create behavior subject for object and subscribe to it on another component?

Question

I created a behaviour subject in a service class.

public personObject: BehaviorSubject<any> =
    new BehaviorSubject<any>({ personId: 1, name: 'john doe' });

On a component that imports this service, i subscribed this behaviour subject like this:

this._subscription.add(
    this._bankService.personObject.subscribe(data => {
        this.personObject = data;
        console.log(data);
    })
);

But I am not able to get exact dataset in the behaviour subject.

Edit I forgot to mention that I used ViewContainerRef to create my sibling component which I added to an answer with a few comments.

Answer 1

Service

@Injectable()
export class DataService {

  private _dataListSource: BehaviorSubject<IData[]> = new BehaviorSubject([]);
  dataList: Observable<IData[]> = this._dataListSource.asObservable().distinctUntilChanged();

  getDataList(): Observable<any> {
      return this.httpService.get('/data').map(res => {
          this._dataListSource.next(res);
      });
  }
}

TS file

export class DataComponent implements OnInit {

    public dataList$: Observable<IData[]>;

    constructor(public dataService: DataService) {}

    ngOnInit() {
        this.dataList$ = this.dataService.dataList;
        this.dataService.getDataList().subscribe();
    }
}

HTML file

<div *ngIf="dataList$ | async; let dataList; ">
    <div *ngFor="let data of dataList">
        {{ data | json}}
    </div>
</div>

Answer 2

In the component where you subscribe to personObject:

import { StoreService } from '../../services/store.service'; // service file with personObject variable

constructor(private _storeService: StoreService) {}

this._storeService.personObject.subscribe( value => {
  console.log(value);
} );

in the component where you change object properties:

import { StoreService } from '../../services/store.service';

constructor(private _storeService: StoreService) {}

ngOnInit(): void {
    let person = { personId: 0, name: '' };
    this._storeService.personObject.subscribe( value => {
      person.personId = value.personId; // set value personId from service
    } );
    this._storeService.order.next({...person, name: 'somebody'  } ); // set new value for name property
  }