title: In JavaScript, what is event.isTrigger?
body: <p>I came across this in some JS code I was working on:</p>
  
  <pre><code>if ( typeof( e.isTrigger ) == 'undefined' ) {
  // do some stuff            
  }
  </code></pre>
  
  <p>This seems to be part of jQuery. As far as I can see it tells you if an event originated with the user or automatically. </p>
  
  <p>Is this right? And given that it's not documented, is there a way of finding such things out without going behind the curtain of the jQuery API?</p>