In Angular, Property Binding is triggered only after a mouse event occurs

I have been working on a web app that connects to a Firebase realtime database. Initially, I used property binding to update the view whenever a specific value in the database changed. This method worked perfectly and the view was updated in real-time.

However, I recently made changes to the database logic and now I need the view to display the value of the most recently added child in a specific path of the database. I modified the service for the component without altering the component's logic. Now, the component is receiving data from the service in real-time, but the property binding only updates the view after a mouse event (such as a click or wheel up). I have confirmed that the component is instantly getting the value, so why is the property binding not updating the view as expected?

Component Logic:

export class RotazioneVolanteComponent implements OnInit {
   public data;
   constructor(private _service: ComponentService) { }
   ngOnInit(){
      this._service.getValue().subscribe(value => this.data = value);
   }

Component View:

<h1>Value: {{data}}</h1>
<h1 [textContent]="data" ></h1>

Answer №1

The issue arose from Angular failing to update the view due to changes not being made within NgZone. To address this, simply define private ngZone: NgZone in the constructor and perform the update as follows:

this.ngZone.run( () => {
   // Update the variable
});

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