Hi Ling,
Thanks for using Syncfusion products.
Your requirement of getting a cell value based on row index and column index can be achieved in the ClientSideRecordSelection event. Please refer to the code-snippet below.
[Javascript]
Please refer to the below link to download the sample application.
http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=sample-100190-891293646.zipPlease let me know if you have any queries.
Regards,
Ranjithkumar.