title: Get the order of list item in jquery sortable
body: <p>I have done this <a href="http://jsbin.com/UBezOVA/1/edit" rel="noreferrer">http://jsbin.com/UBezOVA/1/edit</a>.</p>
  
  <p>When I click the submit button, i want to get the current order of the list item. But, it seems that 
  <code>$("#sortable2").sortable("toArray")</code> does not show the current order of list (for example sortable2).
  How to get the current order of a list.  </p>