[whatwg] Comments on Web Forms 2.0 Working Draft

[Christian Schmidt]

Ian Hickson wrote:
> Generally though, it seems that the author would want to only set a
> control to a valid value... seems like bad UI for script to set a value
> and then later complain to the user that it isn't valid!
Not necessarily.

One scenario could be the following: A page contains a select box 
containg a list of countries, and a select box for containing a list of 
states/provinces in the selected country. When the country is changed, 
the current selection in the state/province select is cleared (and the 
control becomes invalid) and the select is filled with options for the 
new country (or disabled, if state/province is not used in postal 
addresses for that country).

Also it could be that the pattern or required attribute are changed by a 
script instead of the value. This could be on a page with a select box 
for choosing a country, and a text box for entering a postal code. The 
pattern for the postal code control could depend on the country.


Christian