Many time we want to set default image in html image tag when it unable to load given image. We can achieve this in angular as well as in HTML.

<img [src]='path' (error) ="onImgError($event)">

onImgError(event) { 
    event.target.src = 'assets/path_to_your_placeholder_image.jpg';
}

OR

<img [src]='path' (error) ="$event.target.src = 'assets/path_to_your_image.jpg'">

OR

<img src='path' onerror ="this.src = 'assets/path_to_your_placeholder_image.jpg'">