Tutorial on field_observer?

Taylor Strait
Fri, 29 Dec 2006 04:10:10 -0000

I have the standard Country - State - City select boxes in a form and
want the select options to cascade dynamically.  There are a few hits
for similar setups in the forum but I need something more fundamental.
Is there a website / book which details how to build this from scratch?
AWDwR v2 uses a search example which hasn''t helped me much...

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