title: jquery ui autocomplete how to load a default value list
body: <p>very simple question (but I can't find the answer on the Web...): I have an autocomplete field being set this way:</p>
  
  <pre><code>$(document).ready -&gt;
           $('#projecttask_user_name').autocomplete
                   source: "/autocomplete/users"
  </code></pre>
  
  <p>I would like jquery to trigger the source when I select the field in order to get the full list of possibilities even if I haven't typed anything in the field.</p>
  
  <p>How can I do this? Thanks!</p>