title: Google Form trigger on next
body: <p>I have a Google Form made of two sections.</p>
  
  <p>I would like to save the answers to this form (especially time stamp) as soon as the user exits the first section (i.e. when it presses the "next" button).</p>
  
  <p>I guess this is not treated as a <code>submit</code> event (at least in the docs it is never said). Is there a way to create a trigger <code>onNext()</code> which will fire as the user presses on "next", or to get at least the timestamp when it pressed it?</p>