ngif condition check in angular 6 code example

Example 1: ng if else

<div *ngIf="condition; else elseBlock">Content to render when condition is true.</div>
<ng-template #elseBlock>Content to render when condition is false.</ng-template>

Example 2: ng if

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

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