Угловой 8 ngclass if
[ngClass]="{'my-class': step=='step1'}"
GrepperFoo69
[ngClass]="{'my-class': step=='step1'}"[ngClass]="(step=='step1')?'my-class1':'my-class2'"[ngClass]="{'my-class': step=='step1', 'my-class2':step=='step2' }"[ngClass]="{1:'my-class1',2:'my-class2',3:'my-class4'}[step]"[class.my-class]="step=='step1'"