dropdown list in hidden form

Hello , I am new to servlets-jsp and I am struggling to create an online store shopping card with session track.I have to create a page that consists of dropdown list with items and submit button.My question is when I select an item from ddlist, I always have the first hidden field value in orderpage .So how can I manage that when I choose the 3. item in ddlist , I have the 3. item's information in orderpage?

If I understand the question correctly, your solution lies in the Javascript corner. This has essentialy nothing to do with JSP/Servlets.

I am not sure ıt has nothing to do with javascript.What I am trying to do is simple "online store shopping card" with hidden form.I am pretty sure that Every jsp-servlet books has this kind of example.My problem is I am just stuck with how to use dropdown list properly.

I am not at all sure what your question is saying. Perhaps you can explain it better.