Angular ngClass and click event for toggling class

This should work for you.

In .html:

<div class="my_class" (click)="clickEvent()"  
    [ngClass]="status ? 'success' : 'danger'">                
    Some content
</div>

In .ts:

status: boolean = false;
clickEvent(){
    this.status = !this.status;       
}

Instead of having to create a function in the ts file you can toggle a variable from the template itself. You can then use the variable to apply a specific class to the element. Like so-

component.html -

<div (click)="status=!status"  
    [ngClass]="status ? 'success' : 'danger'">                
    Some content
</div>

So when status is true the class success is applied. When it is false danger class is applied.

This will work without any additional code in the ts file.
EDIT: Recent versions of angular require the variable to be declared in the controller - component.ts -

status: boolean = false;