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how to select values for second drop down depending upon value of first drop down

 
abhay patil
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Posts: 9
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Hi can any one help me.
I am trying to select value for my first drop down from the data base[i.e dynamic drop down which will display all the country names]. Depending upon the value you have selected for the first drop down I would like to show all the related data in the second drop down[i.e. all the states for the selected country].
Here is the code:& lt%@page import="java.sql.*"%>
& lthtml>
& ltbody>
& lt% String state = request.getParameter("state"); out.println(state);%>
& ltform name="my" action="abhay.jsp" method="post">
Country Name:& ltselect value=state onchange="my.submit();">
& lt%
if(state==null)
{
Connection con = null;
Statement st = null;
ResultSet rs = null;
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection("jdbcdbc:abhay","root","root");
st = con.createStatement();
String sa="select cname from cname";
rs = st.executeQuery(sa);
while(rs.next())
{
String y = rs.getString("cname");
%>
& ltoption value="& lt%= y%>">& lt%= y%>& ltoption>
& lt%
}
}
catch(Exception e)
{
out.println(e);
}
}
else
{
state= request.getParameter("state");
out.println(state);
}
%>
& lt/select>
& lt/form>
& ltform name="m">
& lt%
String h = request.getParameter("state") ;
out.println(h);
%>
& lt/form>
& lt/html>
 
John Melton
Ranch Hand
Posts: 49
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The way we're accomplishing this is:
1. get the values of the countries in your servlet in the backend, and send that collection to the JSP for rendering.
2. based on the selection from that collection, make an AJAX call to the backend to get the states for that country with the country passed as a parameter, and then populate the second drop-down.

Here's a quick AJAX example that might help.
 
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