Using ajax with struts 1.2.9

Question

Hello Experts ,
First of all I am sorry if I have posted question in a wrong forum but I have tried posting my problem in struts forum also but didn't get reply & I am pretty new to struts.
I am trying to use ajax in struts 1.2.9.I have used 1 dependent combo.When I am changing value in 1 combo it will call an action class which will fetch data for 2nd combo .My problem is ,action class "success" has to be forwarded to some particular jsp.But I want to refresh only a part of page not the whole page.How to refresh just a part of page?? Any idea or any link which can help me.Any help in this will be highly appreciated.Many many Thanx in advance.

Answer 1

Hello Shasi,
Lets take the sample code for one combo box (College) , one change of which I want to display the information of that college in the textboxes below it.So on change of college combo I am calling the action class which is retrieving info of college.My problem is now how to send this data to jsp & what should be the success & failure forward for my action class.
In my JSP I have written something like this....
                       createXMLHttpRequest();
                        queryString2 ="retrieve_college_info.do?";
                        queryString2 = queryString2 + "selcollege="+document.forms[0].college_name.options[document.forms[0].college_name.selectedIndex].value;
                        xmlHttp.open("GET", queryString2, true);
                        xmlHttp.onreadystatechange = handleCollegeRetrieve;
                        xmlHttp.send(null);My action class code goes like this
package ibm.tgmc_nextyear.actionclass;
import ibm.tgmc_nextyear.businesslogic.*;
import ibm.tgmc_nextyear.formbean.*;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;
import java.sql.*;
import java.util.ArrayList;
import org.apache.struts.util.LabelValueBean;
public class CollegeRetrieveInfoAjaxAction extends org.apache.struts.action.Action {
    public ActionForward execute(ActionMapping mapping, ActionForm  form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
               String optionSelected = request.getParameter("selcollege");    
               String responseText="";
               Connection conn = null;
               Statement stmt = null;
               ResultSet rs = null;
               TeamDetailsForm team_frm = null;
               try {
                    conn = getDataSource(request).getConnection();
                    stmt = conn.createStatement();
            rs = stmt.executeQuery("select name , address  , city , pincode , ph_no , hod_name , principal_name , alt_no , website from user.college_table where college_id=" + optionSelected);
*//what after this ???*
        } finally {
            if (rs != null) {
                rs.close();
            if (stmt != null) {
                stmt.close();
            if (conn != null) {
                conn.close();
         *//what should be the value os success forward*
       return(mapping.findForward("success"));
}