What is the proper syntax for invoking a function using an event in Angular?

I have a pair of elements: pictures and camera, with camera as the child element.

Within the camera element, I have the following TypeScript snippet (abbreviated):

@Component({
  selector: 'app-camera',
  templateUrl: './camera.component.html',
  styleUrls: ['./camera.component.scss']
})
export class CameraComponent implements OnInit {
  @Output('onPictureTaken') picture = new EventEmitter<WebcamImage>();
  public webcamImage: WebcamImage;

  pictureTaken(){
    this.picture.emit(this.webcamImage)
}

accompanied by this HTML code:

<button class="actionBtn" (click)="pictureTaken();">Take A Snapshot</button>

Inside the pictures component, here is the TypeScript content instead:

export class PicturesComponent implements OnInit {
 // @Output('picture') picture: WebcamImage;
  public pictures: WebcamImage[];
  constructor() {}

  ngOnInit(): void {}

  onPictureTaken(picture: WebcamImage){
    this.pictures.push(picture);
    console.log("picture taken!!!");
  }
}

With the corresponding HTML markup:

<app-camera ></app-camera>
<table>
    <caption>Photos: </caption>
    <tr (onPictureTaken)="onPictureTaken($any($event))"> </tr>
</table>

Despite all attempts, I am unable to trigger the onPictureTaken function and see the message 'picture taken!!!' in the console. Any guidance?

Answer №1

Your event binding is not in the correct place. The emitter is supposed to be defined for your component app-camera, but you mistakenly placed it inside the tr tag.

Instead of this:

<app-camera></app-camera>
<table>
  <caption>Photos: </caption>
  <tr (onPictureTaken)="onPictureTaken($event)"> </tr>
</table>

You should move it to your component like this:

<app-camera (onPictureTaken)="onPictureTaken($event)"></app-camera>
<table>
  <caption>Photos: </caption>
  <tr> </tr>
</table>

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