Subscribing to Observable Input

Question

Is there a way to subscribe to an Observable which is an @Input?

For example:

export class MyComponent implements OnInit {
  @Inp         


        

Answer 1

You should implement OnChanges and subscribe to the input when it changes.

export class MyComponent implements OnChanges {
  @Input() results: Observable;

  constructor() { }

  ngOnChanges(changes){
      if(changes["results"] && this.results){
          this.results.subscribe(value => ...);
      }
  } 
}

This will allow you to subscribe to the Observable once it is available and re-subscribe to it anytime that the Observable reference changes. You may need to consider unsubscribing from old instance depending on your use-case.