title: Data table column rendering with ajax response
body: <p>I am trying to render column contents with ajax response but it doesn't display anything in the column despite ajax response returning data,</p>
  
  <pre><code>{
      "width": "20%","targets": 6,
      "defaultContent": '',
      "render": function ( data, type, row ) {
          if(row.colData !=''){
              $url="server request url";
              var ret= row.colData
              var aydGuid=row.guid;
              var params = {relatedHID:ret,guid:aydGuid};
                  $.ajax({
                      url: $url,
                      async: true,
                      data: jQuery.param(params),
                      dataType:'html'
                      }).done(function( data ) {
                          alert(data) //displays response  
                          return data //does nothing                                      
                      });
  }
  </code></pre>