无法获取未定义或空引用的属性'aoPreSearchCols'

Question

我正在使用jQuery DataTables 1.10.9。我想禁用contains的默认搜索功能并添加equals。我想添加以下代码：

var oTable = $('.datatable').dataTable();
var oSettings = oTable.fnSettings();
oSettings.aoPreSearchCols[iCol].sSearch = "^\\s*"+'1'+"\\s*$";
oSettings.aoPreSearchCols[iCol].bRegex = false;
oSettings.aoPreSearchCols[iCol].bSmart = false;

以下是我获取上述共享代码的链接：https://www.datatables.net/forums/discussion/4096/filtering-an-exact-match/p1

但是我在这一行收到错误：

oSettings.aoPreSearchCols[iCol].sSearch = "^\\s*"+'1'+"\\s*$";

错误：

  

无法获取未定义或空引用的属性'aoPreSearchCols

如何解决此错误？

更新

               $.ajax({
                type: "POST",
                url: "Default.aspx/ConvertDatadttoString",
                data: '{"appName":"' + appName + '"}',
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function OnSuccess(response) {
                    dataObject = eval(response.d);

                   var oTable = $('#JDatadt').dataTable({
                        "order": [],
                        "dom": "Bfrtip",
                        "buttons": ["csv", "excel", "pdf"],
                        "columnDefs": [{ "className": "dt-center", "orderable": false, "width": 20 }],
                        "bInfo": false,
                        "paging": true,
                        "processing": true,
                        "columns": dataObject[0].columns,
                        "data": dataObject[0].Griddata
                    });
              var oSettings = oTable.fnSettings();
              oSettings.aoPreSearchCols[ iCol ].sSearch = "^\\s*"+'1'+"\\s*$";
              oSettings.aoPreSearchCols[ iCol ].bRegex = false;
              oSettings.aoPreSearchCols[ iCol ].bSmart= false;

                },
                failure: function Onfailure(response) {
                }
            });