hide a button dynamically in ts angular code example

Example 1: hide button in typescript

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

Example 2: angular show element in component

isShown: boolean;

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

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