When should I count the total records in a jQuery DataTable?

I want to check common records in jQuery DataTable and hide / show No Record Found message. Currently I have checked the complete lines in the "fnDrawCallback" section like this, but I will show "no entry" when moving too fast:

  //Instantiate the Datatable
    function configureDataTable() {

        var url = prepareURLforDataTable();

        $scope.table = $('#example').dataTable({                   
            "bServerSide": true,
            "sAjaxSource": url,
            "sAjaxDataProp": "aoData",
            "bProcessing": false,
            "bDestroy": true,
            "bPaginate": true,
            "bInfo": true,
            "bSort": false,
            "searching": false,
            "bLengthChange": false,
            "iDisplayLength": 7,            

            "fnDrawCallback": function (oSettings) {
                //to hide or show no record message    
                var rowsData = $('#example').DataTable().rows().data();
                $scope.count = rowsData.length;
                if ($scope.count == 0) {
                    $scope.ShowNoRecordMsg();
                }
                else {
                    $scope.HideNoRecordMsg();
                }
                $rootScope.hideSpinner();
               //other operations

      

        
        
        
      

    

I have two Div for "no entries" and stuff for "conversation table". $ scope.ShowNoRecordMsg and $ scope.HideNoRecordMsg remove display: none of the "no entry" divs and "conversation table" respectively.