ng if in a class code example
Example 1: Angular 8 ngClass If
[ngClass]="{'my-class': step=='step1'}"
Example 2: conditionally assign a css class angular 9
<div [ngClass]="{'message': info.priority < 10,
'warn': info.priority > 10 && info.priority < 20,
'error': info.priority > 30}">
{{info.text}}
</div>