New 'change' check mode

[bmurashin]

I found a problem with 'blur' checks with jQueryUI datepicker widget field: field loses it's focus before widget updates it's value and validation error displayed, though value is correct. I've added a new 'change' check - it works nice with such widgets and behaves almost the same as 'blur'. I maintained BC, but had to introduce a new array option 'check_modes' spelled almost the same as former 'check_mode' - that can be confusing...

[Abhoryo]

The value returns by the datepicker plugin isn't yet filled its input, so the burl mode detects that the input is empty, right ?

You can break the BC, but add a warning message if the user have defined the 'both' mode, please.

[bmurashin]

Precise, that's "required" validator detects an empty field before it's filled. Ok to break BC, but what type for check_mode option to use - Array as I did or Scalar as it is now?

1. Array give a control to specify any set of modes [submit, blur] or [submit, change], etc.
2. Scalar requires to introduce a new constant for submit+change validation like both_change or whatever. Counter-intuitive I think.

Ok to change check_mode type to array? Should it stay check_mode or rename to check_modes (plural)?

[Abhoryo]

array + check_modes and output a warning if check_mode is defined.

[bmurashin]

Ok, I'll post new PR soon.

[Abhoryo]

ok thx