title: Angular 5 : Event handling for material dropdown
body: <p>I need to call a function in case there is a change in the value of <code>mat-select</code>.
  I have been calling that function on <code>(click)</code> added to <code>mat-option.</code></p>
  
  <p>But if we just use the keyboard to fill up the form, the function is never called(Understandably).
  Is there any way I can call the function on any change? onChange, change events don't appear to work.
  I don't have <code>ngModel</code> on this form-field</p>
  
  <p>Update:
  <code>selectionChange</code> works for single select drop-downs but not for <code>multi-select</code> drop-downs and <code>mat-autocomplete</code>.Is there a way this can be achieved?
  Multi Select Example: <a href="https://stackblitz.com/edit/angular-material-with-angular-v5-jsgvx6?file=app%2Fapp.component.html" rel="nofollow noreferrer">multi-select-stackblitz</a></p>
  
  <p>Update 2:
  onSelectionChange for multiple and autocomplete works.<a href="https://stackoverflow.com/a/50617063/9491345">multi-autocomplete</a></p>