Answers for "condition ngif when has events point"

ng if

<ng-template [ngIf]="heroes" [ngIfElse]="loading">
 <div class="hero-list">
  ...
 </div>
</ng-template>

<ng-template #loading>
 <div>Loading...</div>
</ng-template>

ngif

<div *ngIf="condition; else elseBlock">
         
<button class="xx" *ngIf="flag" (click)="doFunct()">Next</button>
   
--While (t/f boolean variable called "flag") is true
  This button will be visible + click button executes function
  Once this "flag" becomes false this button disapears