【4.さっそくAjax化しよう】
・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>