   </select>
          <select id="span_3" class="select2 span3">
            <option></option>
            <option value="A">A</option>
            <option value="B">B</option>
            <option value="C">C</option>
          </select>
        </div>
      </div>
    </form>

    <script>
      $('.select2').select2({ placeholder : '' });

      $('.select2-remote').select2({ data: [{id:'A', text:'A'}]});

      $('button[data-select2-open]').click(function(){
        $('#' + $(this).data('select2-open')