Using ngFor and ngIf structural directives for model-based DOM control

Any developer that has used a client framework is intimately familiar with two basic operations in an application: iterative rendering from a collection and conditional rendering. The new Angular 2 implementations look a bit different but operate in much the same way.

Note

The code, links, and a live example are available at http://ngcookbook.herokuapp.com/3211/.

Getting ready

Suppose you had the following application:

[app/article-list.component.ts] 
 
import {Component} from '@angular/core'; 
 
@Component({ 
  selector: 'article-list', 
  template: '' 
}) 
export class ArticleListComponent { 
  articles:Array<Object> = [ 
    {title: 'Foo', active: true},  
    {title: 'Bar', active: false}, 
    {title: 'Baz', active: true} 
  ]; 
} 

Your objective is to iterate through this and display the article title only if it is set as active.

How to do...