Answers for "angular ngif or"

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>

ngif else

<ng-container
  *ngIf="isLoggedIn; then loggedIn; else loggedOut">
</ng-container>

<ng-template #loggedIn>
  <div>
    Welcome back, friend.
  </div>
</ng-template>
<ng-template #loggedOut>
  <div>
    Please friend, login.
  </div>
</ng-template>

angular ngif

<label *ngIf="1==1" > show Label when condition is true </label>

*ngif vs ngif

ngIf is the directive. Because it's a structural directive (template-based), you need to use the * prefix to use it into templates.

*ngIf corresponds to the shortcut for the following syntax ("syntactic sugar"):

<template [ngIf]="condition">
  <p>
    Our heroes are true!
  </p>
</template>
Equivalent to:

<p *ngIf="condition">
  Our heroes are true!
</p>