title: Select first jquery UI result automatically
body: <p>I am using jQuery Autocomplete to search a local database of cities. Here is the code:</p>
  
  <pre><code>$('#txt_search_city').autocomplete({
      source: url,
      delay: 0,
      autoFocus: true,
      select: function( event, ui ) {
          $( "#id_city" ).val( ui.item.id );
          $(this).closest('form').submit();
      },
      focus: function( event, ui ) { event.preventDefault(); }
  });
  </code></pre>
  
  <p>I'd like the first returned value to be selected by default (like it works on facebook). So essentially, if they just hit enter they will trigger the selection of the first result.</p>
  
  <p>I thought that's what <code>autoFocus: true</code> did, but it isn't working. Not showing errors, just not selecting the first result.</p>
  
  <p>Thoughts?</p>