title: Get selected ngModel value in Angular / Ionic 2?
body: <p>How can I get the selected option in constructor / function, using Angular / Ionic 2?</p>
  
  <pre><code>&lt;ion-item&gt;
      &lt;ion-label&gt;Quantity&lt;/ion-label&gt;
      &lt;ion-select [(ngModel)]="qty"&gt;
          &lt;ion-option value="1" selected="true"&gt;1&lt;/ion-option&gt;
          &lt;ion-option value="2"&gt;2&lt;/ion-option&gt;
          &lt;ion-option value="3"&gt;3&lt;/ion-option&gt;
      &lt;/ion-select&gt;
  &lt;/ion-item&gt;
  
  &lt;button ion-button full (click)="addToCart()"&gt;Buy Now&lt;/button&gt;
  </code></pre>
  
  <p>I've tried this:</p>
  
  <pre><code>export class ProductPage {
      qty: any;
  
      constructor(public navCtrl: NavController) {
  
      }
  
      addToCart() {
          console.log(this.qty);
      }
  }
  </code></pre>