app.component.html hide and show div on button click code example

Example 1: hide element when pressing button angular

<div class="yourCssClass" *ngIf="this.isButtonVisible" (click)="this.isButtonVisible = false">
...
</div>

Your TypeScript

export class AppComponent {
   private isButtonVisible = true;
}

Example 2: hide button in typescript

var link = document.getElementById('nav-ask');
link.style.display = 'none'; //or
link.style.visibility = 'hidden';