Угловой 8 ngclass if
[ngClass]="{'my-class': step=='step1'}"
GrepperFoo69
[ngClass]="{'my-class': step=='step1'}"<div
[className]="isActive ? 'active' : 'inactive'">
</div>
<div [ngClass]="{'message': info.priority < 10,
'warn': info.priority > 10 && info.priority < 20,
'error': info.priority > 30}">
{{info.text}}
</div>
[ngClass]="{'my-class': step=='step1', 'my-class2':step=='step2' }"