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apply valudation for column

Hello,

i want to apply validation for one column like username . how it is possible to apply the validation for username if username is not present in database then it will show me alert mesg " username is not present.

example :- suppose user name : seema , and i can write seema1234 then it will show me alert mesg " username is invalid " it is possible in dhtmlxgrid if possible then please tell me link of example so i can used it .

please reply me as soon as posiible.

regards
Suraj

You can use defineAction method to catch messages with error which comes from server side. Please find more information here http://dhtmlx.com/dhxdocs/doku.php?id=dhtmlxdataprocessor:custom_server_side_responses