The value of seam cannot be acquired with JSF.
Hello.
I have my first simple program of ejb3 by using Seam and JSF.
Though I tried ajax by this program
The value acquired from the entity bean cannot be displayed as an element of JSF.
The parameter passed by ajax in the session bean can be acquired, and DB can be accessed.
The value of the text box doesn't change when the result is displayed after it communicates with ajax asynchronously.
Could anyone advise,please?
## Environment ##
JBOSS4.0.5GA
jdk1.5.0_06
jboss-seam-1.0.1.GA
## Register.java ##
@Local
public interface Register {
public String start();
public String confirm();
public String register();
@WebRemote
public boolean checkExists(String username);
public void destroy();
}## RegisterAction.java ##
@Stateful
@Name("register")
@Scope(CONVERSATION)
public class RegisterAction implements Register {
@In(required = false)
@Out(required=false)
private User user;
@PersistenceContext
private EntityManager em;
@Begin
public String start(){
user = new User();
return "/register.jsp";
}
@Conversational(ifNotBegunOutcome = "/register.jsp")
public String confirm(){
return "/confirm.jsp";
}
@End
@Conversational(ifNotBegunOutcome = "/register.jsp")
public String register(){
em.persist(user);
return "/registered.jsp";
}
public boolean checkExists(String username){
user = (User)em.createQuery("select OBJECT(o) from User o where o.username=:username").setParameter("username", username).getSingleResult();
if(user == null) return true;
else return false;
}
@Destroy
@Remove
public void destroy(){}
}## register.jsp ##
<%@ page language="java" contentType="text/html; charset=Shift_JIS" pageEncoding="MS932"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<html><head><title>register</title></head>
<script type="text/javascript" src="seam/remoting/resource/remote.js">
</script>
<script type="text/javascript" src="seam/remoting/interface.js?register">
</script>
<script type="text/javascript">
<!--
function checkExists(i) {
s = i.value;
Seam.Component.getInstance("register").checkExists(s, checkExistsCallback);
}
function checkExistsCallback(result) {
if (result) {
// alert("It is not registered.");
} else {
document.getElementById("error").innerHTML="It has already been registered.";
// alert("It has already been registered. ");
}
}
//-->
</script>
<body>
<f:view>
<h:form>
<table border="0">
<tr>
<td>User ID</td>
<td><h:inputText value="#{user.username}" required="true" onblur="javascript:checkExists(this);"/><span id="error"></span></td>
</tr>
<tr>
<td>Name</td>
<td><h:inputText value="#{user.name}" required="true" /></td>
</tr>
<tr>
<td>Password</td>
<td><h:inputSecret value="#{user.password}" required="true" /></td>
</tr>
</table>
<h:messages />
<h:commandButton type="submit" value="confirm" action="#{register.confirm}" />
</h:form>
</f:view>
</body></html>
