What's a FormBean? It's not part of Servlets or JSP.
In any case, no: JavaScript, which executes on the client after the HTML is generated and delivered as the response, cannot directly interact with
Java code running on the server to create that response.
There are likely hundreds to thousands of examples of doing this on the Web. Please search.
If you want to use jQuery for your Ajax and JavaScript needs (
you should use a library, Ajax has too many cross-browser nuances to do it yourself) you can grab the free sample source code for
my jQuery book. The code for chapter 8 shows how to use Ajax and JSP to populate dropdowns dynamically