ZK - Open Source Ajax Java Framework

<zk xmlns:n="native">
  
  <zscript>
      Map m = Executions.getCurrent().getParameterMap();
      Iterator ir =  m.keySet().iterator();
      StringBuffer sb = new StringBuffer();
      while(ir.hasNext()){
              String key = (String) ir.next();
              sb.append(key+":"+m.get(key)[0] +"\n");
      }
      String ret = sb.toString();
  </zscript>
  <n:pre>
      ${ret};
    
    ${userName};
    ${password};
  </n:pre>
</zk>

package j7v01um$v10;
import org.zkoss.zk.ui.*;
import org.zkoss.zk.ui.event.*;
import org.zkoss.zk.ui.util.*;
import org.zkoss.zul.*;
import org.zkoss.zhtml.Form;
public class TestComposer extends GenericForwardComposer{
    private Textbox userName;
    private Textbox password; 
    private Form form;
  
    public void onSubmit$form(Event e){
      if(validate()){
         Clients.evalJavaScript("jq('#"+form.getUuid()+"')[0].submit();");
      }else{
        try {
                Messagebox.show("Wrong input ");
        } catch (InterruptedException ex) {
                ex.printStackTrace();
        }
      }
    }
  
    public boolean validate(){
      if(!userName.getValue().matches("\\w{4,15}")){
        return false;
      }
      if(!password.getValue().matches("\\w{4,15}")){
        return false;
      }
      return true;
    }
}

<zk xmlns:h="xhtml" xmlns:w="client">
  
  <h:form id="form" apply="j7v01um$v10.TestComposer" action="Submited.zul" method="POST" >
    <h:table> 
      <h:tr> 
       <h:tb> User Name </h:tb> 
       <h:tb> 
        <textbox id="userName" name="j_username"></textbox> 
       </h:tb> 
      </h:tr> 
      <h:tr> 
       <h:tb> Password </h:tb> 
       <h:tb> 
        <textbox id="password" type="password"  name="j_password"></textbox> 
       </h:tb> 
      </h:tr> 
      <h:tr> 
       <h:tb> 
        <h:input type="submit" value="Login"></h:input> 
       </h:tb> 
       <h:tb> 
        <h:input type="button" value="Reset" h:onclick="cleanErr();" forward="onClick=onClean"></h:input> 
       </h:tb> 
      </h:tr> 
    </h:table> 
  </h:form>
  <script>
    zk.afterMount(function(){
     jq("$form").submit(function(){
       zAu.send(new zk.Event(zk.Widget.$(this), 'onSubmit'));
       return false;
     });
    });
  </script>
  
</zk>