What types of data validation events are commonly seen in the client-side form validation?

Question

plz help me!!!

Answer 1

Checking for numeric/non-numeric, simple formatting (like phone numbers), date formatting... anything that involves basic string manipulation or analysis, either with logic or regular expressions.

But client-side form validation is very dangerous and should *always* be backed up by server-side checks.

Answer 2

Check that entry is not null, data types match eg no nnumerics in text fields, entry does not contain illegal xters eg *#@ etc