Javascript error on grid: Cannot read property 'slice' of undefined

[Jay]

I have a simple grid setup with the datasource is returning a list.

  <kendo-grid name="grid" height="550">
      <datasource type="DataSourceTagHelperType.WebApi" page-size="5">
          <transport>
               <read url="@Url.Action("GetSchedule", "Home")" />
          </transport>
      </datasource>
      <columns>
           <column field="SalesRepName" title="Sales Agent" />               
           <column field="Shift" title="Shift" />
           <column field="Phone" title="Phone" />
      </columns>
 </kendo-grid>

  public ActionResult GetSchedule([DataSourceRequest] DataSourceRequest request)
        {
            // get scheduled sales rep.
            var result = _idb.RetrieveCurrentSchedule("LSL", "NH");

            var dsResult = result.ToDataSourceResult(request);

            return Json(dsResult);

        }

bundle.js:1 Uncaught TypeError: Cannot read property 'slice' of undefined

 

[Mihaela]

Hi Jay,

Thank you for the provided code snippets.

By design, this error occurs during the binding of the widget to the data source. Most probably the variable "result" does not represent an array of data items, which is returned as a JSON object by the "GetSchedule" Action method.

I would suggest debugging the "Read" Action method to check if the variable "result" contains an array of items. 

In addition, I have prepared a demo project (attached). Please modify it based on the behavior you are experiencing and send it back in the thread. I will test it locally and follow up with the respective suggestions.

Thank you for your cooperation.

 

Regards, Mihaela Progress Telerik

[Jay]

Thanks, for the response. yes I checked that the result, it is an array. I fixed the problem by creating a new web app using the Telerik grid project template. The grid is now working. I updated Telerik through your control panel but Visual studio did not have the asp.net core extensions installed so i tried to manually add Telerik asp.net core UI pieces to my asp.net core project and I think something is messed up. So I downloaded the asp.net core msi installer from your site. After installing it I now have the Telerik asp.net core project template.