angular create show unshow text code example

Example 1: angular.io hide

<div [style.visibility]="(numberOfUnreadAlerts == 0) ? 'hidden' : 'visible' ">
   COUNTER: {{numberOfUnreadAlerts}} 
</div>

Example 2: angular show element in component

isShown: boolean;

ngOnInit(){
  isShown = false; //hidden every time subscribe detects change
}

toggleShow() {
  this.isShown = ! this.isShown;
}