I have found this sample in NET version https://demos.telerik.com/aspnet-mvc/grid/editing-custom-validation#source-code
Do you have same for AngularJS or Jquery ?
Thank you for reaching out.
Here is the Kendo UI jQuery demo for custom validator editing in grid:
Also, the demo below demonstrates how to integrate a custom validator in AngularJS:
Feel free to let me know in case of any other questions.
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