Supplying additional parameters to render URLs from the client side

[Subbu Allamaraju <subbu@bea.com>]

In WSRP 1.0/2.0, portlets can use forms with action URLs to let 
users/browsers supply new parameters to portlets. How would one do that 
with render URLs?

Here is a use case.

A portlet generates a form containing a dropdown for zip codes. The 
portlet would like to use some JavaScript to supply the selected zip 
code to a render URL to render some relevant markup.

How would the portlet solve this use case?

Regards,
Subbu
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