title: Ajax gives me this error Uncaught Error: Syntax error, unrecognized expression
body: <p>this is my ajax script and this is the error Uncaught Error: Syntax error, unrecognized expression the code works and removes the second drop down menu but doesn't append the updated 1</p>
  
  <pre><code>$(document).ready(function(){
      $('#Channel_dropdown').change(function(){
          var channel = $('#Channel_dropdown').val()
          alert(channel);
          $.ajax({
              url: "/advanced_subchannel/",
              type: "GET",
              data: {
                  'ch_id' : channel,
              },
              success:function(req){
                  $('#subChannel_dropdown').remove();
                  $(req).find('#advancedsearch_subchannels').each(function(i){
                      $('#advancedsearch_subchannels').append($(req).find('#subChannel_dropdown'));
                  });
              }   
          });
      });
  });
  </code></pre>