Is it possible to add a dynamic class to host in Angular 2?

Question

I know that in Angular2 I can add a class \'red\' to a component\'s selector element by doing this:

@Component({
    selector: \'selector-el\',
    host: {
          


        

Answer 1

You can use something like that:

@Directive({
  (...)
  host: {
    '[class.className]' : 'className', 
    '[class]' : 'classNames' 
  }
}
export class MyDirective {
  constructor() {
    this.className = true;
    this.classNames = 'class1 class2 class3';
  }
}