This is a new event, which is not documented.. In the upcomming new docs it is documented as:
validationCell(cellobject, errormsg, iRow, iCol)
No triggred event available
If defined this event can replace the error message dialog (info_dialog), that appear when a validation error occur. The event is available in cell edit and inline edit modes.
The first parameter cellobject is a DOM cell object, the second parameter errormsg is the text that is returned when a validation error occur ( see colModel editrules options). The third and four parameters are the index row (not row id) and the column number (starting from 0).
Please let us know if you have difficulties using this event
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