Passing ngFor variable to an ngIf template

All you need is to use [ngTemplateOutletContext] Read More

Here is the way how you can achieve that :

<div>  <h3>All Templates</h3>  <ul *ngFor="let number of numbers">    <ng-container [ngTemplateOutlet]='number % 2 == 0 ? even_tpl : odd_tpl' [ngTemplateOutletContext]="{number:number}"></ng-container>  </ul></div><ng-template #odd_tpl let-number='number'>  <li>Odd: {{number}}</li>  </ng-template><ng-template #even_tpl let-number='number'>  <li>Even: {{number}}</li>  </ng-template>

WORKING DEMO

look here: Pass variable in Angular 2 template

<div *ngFor="foo in foos">    <ng-container *ngTemplateOutlet="inner; context:{name:foo}"></ng-container></div><ng-template #inner let-name="name">    {{ name }}</ng-template>

It's because the way template scope works. Templates in Angular have dynamic scope instead of regular javascript lexical scope, that means, the {{ number }} expression inside the ng-template is not pointing to the same number variable in your *ngFor, although one should think it would since you're kinda evaluating the template expression where <ng-container> is.

If you actually define a number property in your AppComponent, let's say number = 42, you can see that all the {{number}} expressions inside <ng-template> evaluates to 42.

So either you should define your templates inside the scope of the *ngFor, where the number variable has the desired value, or somehow pass this value to both even_tpl and odd_tpl. As @Vivek has pointed out, you can do this with ngTemplateOutlet and ngTemplateOutletContext.