title: Angular - Select - Directive on change value
body: <p>I want to create a directive (alert-select) that can make some actions when I change the value of a select element</p>
  
  <pre><code>&lt;select alert-select [(ngModel)]="area_id"&gt;
      &lt;option value="1"&gt;Area 1&lt;/option&gt;
      &lt;option value="2"&gt;Area 2&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>I want (without use (change)) to alert(area_id) the value of the select every time I change it.</p>