・index.xhtml
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<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<h:head>
<title>AjaxChat ログインページ</title>
</h:head>
<h:body>
<h1>AjaxChat ログインページ</h1>
<h:form id="loginForm" prependId="false">
Room Name: <h:inputText id="roomName" value="#{loginPage.roomName}" validator="#{loginPage.validate}" />
<h:message id="roomNameError" for="roomName" style="color: red"/><br />
User Name: <h:inputText id="userName" value="#{loginPage.userName}" validator="#{loginPage.validate}" />
<h:message id="userNameError" for="userName" style="color: red"/><br />
<h:commandButton id="login" value="Login" action="#{loginPage.login}">
<f:ajax execute="roomName userName" render="roomNameError userNameError"/>
</h:commandButton>
</h:form>
</h:body>
</html>
