try this
http://badpopcorn.com/blog/2008/09/11/rails-observer-field/
On Wed, Feb 9, 2011 at 11:56 AM, selva raj
<ksraj.odc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> Hi ,i am new to rails so i want to learn --- select state according
> to the country and select city acc to state using observe field ,can u
> give some websites to learn select_tag and observe field topic.
> Thanks in Advance
>
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