Based on your view I cannot find any irregularities in the code. You could try debugging the application yourself and check whether your action is actually called and the json data is returned or the Kendo Grid
is not binding correctly. Please, check the routing of the MVC controllers and the route, which is executed from the Grid query. Make sure you do not have duplicate routes or urls, which corresponds with urls of Sitefinity pages or items. I suggest testing the action methods with Fiddler
and see what status code and result will the query return. Since, you are using post method, you could try sending an empty json instead of no data, if you have this scenario possible. However, I assume the issue is really coming from the configurations, so the above suggestions could help you investigate whether the problem comes from the controller's action, the routing, the Grid binding or something outside Sitefinity and Kendo configurations.
Additionally, if the above does not help, I can suggest you open a support ticket where you can send us the controls, or if necessary the entire project so that we can investigate this behavior in further depth.
Ivan D. Dimitrov
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Sitefinity CMS Ideas&Feedback Portal
and vote to affect the priority of the items