title: retrieve last value from datatable
body: <p>How do i retrieve a value from the last row in a table within the fnDrawCallback function? </p>
  
  <p>I am trying to do some other stuff on the page but just need one value from a particular column in the data that has been sent back</p>
  
  <pre><code>var sTable = $('.datatable').dataTable({
          "bJQueryUI": true,
          "sPaginationType": "full_numbers",
          "bScrollCollapse": true,
          "aaSorting": [[1, "desc"]],
          "bServerSide": true,
          "bProcessing": true,
          "sAjaxSource": CycleTimeReport,
          "aoColumns": [
              { "sName": "Course", "sClass": "ellipsis" },
              { "sName": "Cost", "sClass": "ellipsis" }
          ],
          "fnServerData": function (sSource, aoData, fnCallback) {
              var data = new Object();
              data.jsonAOData = JSON.stringify(aoData);
              dataToSend = data;
  
              $.ajax({
                  contentType: "application/json; charset=utf-8",
                  type: "POST",
                  url: sSource,
                  data: JSON.stringify(dataToSend),
                  success: function (msg) {
                      fnCallback(msg);
                  },
                  error: function (XMLHttpRequest, textStatus, errorThrown) {
                      if (document.Invoice.hostname == "localhost") {
                          alert(XMLHttpRequest.status);
                          alert(XMLHttpRequest.responseText);
                      }
                  }
              });
          },
          "fnDrawCallback": function (aoData, oObj) {
  
          },
          "oLanguage": {
              "sSearch": "_INPUT_"
          },
          "fnInitComplete": function (oSettings, json) {
          },
          "bSortCellsTop": true
      });
  </code></pre>