How to do signup form like hotmail ?

I want to do a form like hotmail

I mean. When choose a country, all the state of that country will show up.
=> how to that ?

and I want all option must fill when submit, if not don't submit.

Please help me

Thanks

 

Generally if its going to be very large like this or the other common one is, selecting car models, then you would use Ajax. So when a value is selected in a dropdown menu it does a partial post back with the selection which then populates the next dropdown.

If your using .Net then the Microsoft Ajax Toolkit contains a control for this http://www.asp.net/ajax/ajaxcontroltoolkit/samples/CascadingDropDown/CascadingDropDown.aspx

 

Yes like that, But i am looking for PHP or HTML.

 

It cannot be done with pure HTML, needs both javascript and a serverside language as well.

Unsurprisingly googling cascading dropdown PHP brings up a lot of examples

 

ok
i still looking for a example like https://signup.live.com
If anyone know and have, please give me
Thanks

 

BUmp, who know please help me .....