Hi ,
Is there a way to validate a specific range of cells by using the validator method ? For eg, when there are 30 rows in a table and I add a new row, the validation for a cell is happening for the previous 30 rows as well. Is there a way to stop this ?
Unfortunately, it is not possible. The whole table is being validated after any value from the table is changed.
Thank you 
Hi again @alikhodja
nearly forgot about that! The option will be available (hopefully) in the next version as we just merged a PR that allows that https://github.com/handsontable/handsontable/pull/4519#issuecomment-340747289