Dynamic changes in JSP .....Urgent!!!!!!!!!!

Question

Hi all,
I am having 2 list boxes (using select tag of html)in my registration.jsp page.
one select tag : main account types
second select tag : sub types for each main account types.
first select tag is dynamically populated from the database. i have done it.
but when user selects the main account type from the first list box, the second list box should be automatically populated depending upon his selection in the first list box.
how can i do it efficiently?
i am trying with javascript but i am not fully successful.
please help
vivek

Answer 1

First solution
Try XMLHTTP
=======================================================
     <div id="divDisplay">The response will be put in here</div>
     <input type="button" onclick="sendData();" value="Send it!">
     <script>
     function sendData(){
          var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
          xmlhttp.Open("POST", "http://www.yoursite.com/populate_second_listbox.jsp", false);
          xmlhttp.Send("<timesheet>An impossibly useless timesheet fragment</timesheet>");
          divDisplay.innerHTML=xmlhttp.responseText;
     </script>
====================================
This actually sends a request and receives response in the background of your first jsp. Sending request and recceiving response occurs in JavaScript. The only thing is that it might work only on IE
for More visit :
http://www.15seconds.com/issue/991125.htm or search google for xmlhttp
Second solution
Self submit the jsp on the onChange javascript event of the master list and populate the second list according to the value selected.
This can be done with the appropriate testings of course so as populating the second list will occur only when the request.getParameter("firstlist") value is not null.
Hoipe this helps