title: Change detection in Angular 2.0
body: <p>I have an Angular2.0 component:</p>
  
  <pre><code>import {Component, View, FORM_DIRECTIVES} from 'angular2/angular2';
  
  @Component({
    selector: 'font-size-component',
    properties: ['fontSize'],
    events: ['fontSizeChanged']
  })
  @View({
    template: `&lt;input id="fontSize" [(ng-model)]="fontSize"/&gt;`,
    directives: [FORM_DIRECTIVES]
  })
  export class FontSizeComponent {
    constructor() {
  
    }
  }
  </code></pre>
  
  <p>Now, I want this component to trigger an event (using event-binding) when the input changes.</p>
  
  <p>On Angular 1.X I had several options (<code>ng-change</code> or <code>$scope.$wacth</code>). I am looking for a similar solution, so when the input changes I will be able to use <code>eventemitter</code> and trigger an <code>fontSizeChanged</code> event.</p>
  
  <p>Thanks,</p>
  
  <p>Yaniv</p>