title: jQuery ajax:before event
body: <p>I've seen some coworkers use this in rails </p>
  
  <pre><code>    $('[data-once=true]').live('ajax:before', function(request, e) {
  
  });
  </code></pre>
  
  <p>However I'm trying to use it with jquery and it doesnt work, does this event comes with the rails jquery adapter?</p>