title: get aoColumnDefs and aoColumns from $.getJSON request from server?
body: <p>i have just started using datatables 1.9 jquery plugin but facing to get datatables configuration from server side.
  my datatables code is :</p>
  
  <pre><code>$.ajax({
          type: "POST",
          url: "./viewController",
          data:{ "TableName" : "ViewGridDept",
          "Call" : "gridConfiguration"},
          dataType:"json",
          success: function(data){
          //columns=data.aoColumns;
          var coldata = eval( '('+data+')' );
          alert(coldata.aoColumns);
          employeeTable = $("#EmployeeTable").dataTable({
          "bJQueryUI" : true,
          "sPaginationType" : "full_numbers",
          "bFilter": true,
          "bInfo": true,
          "bServerSide": true,
          "sAjaxSource" : "./viewController",
          "aoColumns":coldata.aoColumns ,
          "aoColumnDefs":coldata.aoColumnsRef,
          "fnServerData": function ( sSource, aoData, fnCallback ) {
              aoData.push( { "name" : "TableName", "value" : "ViewGridDept" },
              { "name" : "Call", "value" : "Data" } );
              $.ajax( {
                      "dataType": 'json', 
                      "type": "POST", 
                      "url": sSource, 
                      "data": aoData, 
                      "success": fnCallback
                      } );}
  </code></pre>
  
  <p>and my json from server side is</p>
  
  <pre><code>{"aoColumns":[{"mDataProp":"deptName","sTitle":"Department Name"},{"mDataProp":"deptId","sTitle":"Department Id"}],"aoColumnsRef":[{"aTarget":["2"]},{"aTarget":["1"]}]}
  </code></pre>
  
  <p>but my datatables not loading the data.my question is how to use nested json for datatable <code>"aoColumns":coldata.aoColumns ,
              "aoColumnDefs":coldata.aoColumnsRef,</code></p>