Add class to an element in Angular 4

Question

I was trying to create an image gallery with Angular 4.The logic behind this is to add a Cascading Style Sheet (CSS) class to the selected image that will show a red border on t

Answer 1

Here is a plunker showing how you can use it with the ngClass directive.

I'm demonstrating with divs instead of imgs though.

Template:

TS:

export class App {
  selectedIndex = -1;

  setSelected(id: number) {
    this.selectedIndex = id;
  }
}