title: onselected event in md-select in Angular 4
body: <p>I would like call a function in typescript on choosing a value using md-select. What is the property used for this purpose in material design ?</p>
  
  <pre><code>   &lt;md-select placeholder="State"&gt;
         &lt;md-option *ngFor="let state of states" [value]="state.code"&gt;{{ state.name }}
     &lt;/md-option&gt;
  </code></pre>
  
  <p></p>