check if Kendo grid contains item

Question

HI, ive got the following question. We have a kendo grid.

but how can i check if the kendo grid contains a specific item ?

 

this is wat i have so far:

 

<script>
      $(function() {

          $('form').on('submit',
              function(e) {

                  @* Add the data from the grids *@
                  var numbers = $("#NumberGrid").data('kendoGrid').dataSource.view().toJSON();
                  $('#@Html.IdFor(m => m.NumbersJson)').val(JSON.stringify(numbers));


                  // client side validation
                  var lineGroupId = $('#@Html.IdFor(m => m.LineGroupId)').val();

                  // check if lineGroupId is in numbers (if value is set)
                  var lineGrouIdIsInNumbers = false;

                  // code to check number in list
                  var numbersData = numbers.dataSource.data();
                  for (var i = 0; i < numbersData.length; i++) {
                       var numberdata = numbersData[i];
                       var number = numberdata.value;
                       if (number === lineGroupId) {
                           lineGrouIdIsInNumbers = true;
                     }
                  }

                  if (lineGrouIdIsInNumbers === false) {
                      // enable button and change text
                      $("#submitButton").prop('disabled', false).val(valueOfSubmitButton);

                      // show error message (under submit button)

                      // return false ( or prevent default action)
                      e.preventDefault();
                      //return false;
                  }
              });

 However the page is crashing and i think it is because of my for loop to check if the number exists in the grid , so how can i fix this ?

 

thnx guys