struts1 with Ajax using struts tags

Question

I have a problem/doubt and describing here.I am using struts1.1(no plain jsp's only struts tags) and needs to implement ajax in that.Q-1) With out giving "action" property can't we write ?. If no I am using ajax in that
form(now my form having button to submit form data). Could any one please help how to add my response back to form variable in same page.

Login Success

my action class is

package app;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

public class DetailsAction extends Action {    
 public ActionForward execute (ActionMapping mapping, ActionForm  form, HttpServletRequest request,HttpServletResponse  response) throws Exception    
 {
 RegisterForm detailsForm = (RegisterForm)form;
 detailsForm.setUsername("Struts");
 System.out.println("inr"+detailsForm.getUsername());
 return mapping.findForward("success");
 }    
} 

Answer 1

When you do AJAX in S1, you are always responding directly to the browser. You need to write your data to the ServletOutputStream and return null. You do not need to use any ActionForward.

Comments

Well, you *may* do that, but it's not a requirement; Ajax may return HTML etc.