As a very simple example, I wrote a Dutch postal code field and included this in the plugin init:

if (is_plugin_enabled('form')) {
        form_custom_field_type_manager('dutch_postal_code','Dutch postal code','my_plugin/input/postcode','output/text','my_plugin_validate_postal_code');
    }

my_plugin_validate_postal_code made sure that it had the correct format.

Cool, Kevin. And it is loading from a text file? How does it get the data?

Maybe someone has already set-up a model for countries, states/regions, cities. It is rather complex, but it would be very cool to get it done through your plugin.

Hi Yakiv,

Sorry - your last question is what I do for paying clients. I've given you the tools but I can't write the code for you.

Understood. ...Has anyone else done it, that wouldn't mind contributing a full working example?

i also had a problem with sorting order of puldown list and after i have fixed the bug described in 2126 ticket it works for me.

I'm also interested into a way to get list of countrys and cities fro profile form...