To develop cascading select drop down box from web service

Hi,
I have two select drop downs one is "STATE" and other is "CITY". I am fetching the values for state drop down from a web service method "return"(*a list is returned from that method*) . Now i have a method in a webservice which accepts a string type argument(state) which returns the cities corresponding to that state. I made another drop down from "return"( list is returned from that method) of this second method which gives me city.
Now what i want to do is on selecting a state the webservice method should get executed passing "selected state" as a parameter to my web service function and that return will populate my second drop down list.
Can partial trigger help me in this?
If partial trigger is helpful,how will i pass an argument to my second method which is returning me cities?
OR
Is there some other way to do it?

Hi,
check this one: http://www.oracle.com/technetwork/developer-tools/adf/learnmore/70-dependent-listboxes-using-ws-286107.pdf
Frank

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