Remove or add class in Angular

Question

I have a list and the plugin (dragula) I used, adds certain CSS class on certain action. I am using Angular 5. I want to find out the presence of certain class (

Answer 1

The Best and easiest way is : -

If student is null then dissabled else not. Use this in button attribute. If you are using bootstrap theme

[ngClass]="{disabled: (students === null) ? true : false}"