form validation on dropdown

[eluser]Krzemo[/eluser]
What values you have for options? Numbers? Text?
If numbers use i.e. value="0" for "please select..." option and in rules put 'required|is_natural_no_zero'.
If texts make "please select..." value="" and rule 'required' should work.
If none of those two apply - write your own callback (http://ellislab.com/codeigniter/user-gui...#callbacks)

Regs
K