display one element based on other elements visibility with ngif angular code example

Example 1: hide and show in angular 8

<button (click)="toggleShow()" type="checkbox" >show/hide</button>

<div *ngIf="isShown" class="row container-fluid"  id="divshow" >
Div Content

</div>

Example 2: angular.io hide

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