title: how to fire google map places_changed event without enter
body: <p>Here is my code</p>
  
  <pre><code>searchBox = new google.maps.places.SearchBox(input);
  google.maps.event.addListener(searchBox,"places_changed",that.search);
  </code></pre>
  
  <p>I want to trigger <code>places_changed event</code>  When user input string</p>