【发布时间】：2014-02-15 14:28:26
【问题描述】：
我正在编写一个用户可以更改其帐户设置的页面。还有他的密码。
但我不想一直显示他可以输入新密码的字段。
因此，当我单击此按钮时，我创建了一个命令按钮“更改密码”，新密码的输入字段应该会显示出来。我为此使用了 c:if 。单击按钮时，我将 ManagedBean 中的布尔值 showPasswordFields 设置为 true。这行得通。但是使用 ajax 的页面更新不起作用。
我在我的 commandButton 中使用了这一行来更新整个表单：
<p:ajax update=":formUserSettings" />
这是我的页面：
<?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:ui="http://java.sun.com/jsf/facelets" xmlns:p="http://primefaces.org/ui"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:c="http://java.sun.com/jsp/jstl/core">
<h:body>
<ui:composition template="/META-INF/templates/templateContentOne.xhtml">
<ui:define name="title">
<h:outputText value="User-Settings" />
</ui:define>
<ui:define name="content">
<h:form id="formUserSettings">
<p:tabView id="TabViewUserSettings">
<p:tab title="Account" id="TabAccount">
<p:panelGrid>
<p:row>
<p:column>
<h:outputLabel value="User-No" />
</p:column>
<p:column>
<p:inputText value="#{userSettingBean.user.ID}" />
</p:column>
</p:row>
<p:row>
<p:column>
<h:outputLabel value="E-Mail" />
</p:column>
<p:column>
<p:inputText value="#{userSettingBean.user.EMAIL}" />
</p:column>
</p:row>
<p:row>
<p:column>
<h:outputLabel value="Password" />
</p:column>
<p:column>
<p:commandButton id="commandButtonChange Password" value="Change Password"
actionListener="#{userSettingBean.enablePasswordFields}" immediate="true">
<p:ajax update=":formUserSettings" />
</p:commandButton>
</p:column>
</p:row>
<c:if test="#{userSettingBean.showPasswordFields}">
<p:row id="RowConfirmOldPw">
<p:column>
<p:inputText id="oldPwd"
value="#{userSettingBean.oldPassword}" />
<p:watermark for="oldPwd" value="Old Password" />
</p:column>
</p:row>
<p:row id="RowTypeNewPassword">
<p:column>
<p:password id="pwd1" value="#{userSettingBean.password1}" match="pwd2" lable="New Password"/>
<p:watermark forElement="pwd1" value="Password" />
</p:column>
<p:column>
<p:password id="pwd2" value="#{userSettingBean.password2}" lable="Re-enter"/>
<p:watermark forElement="pwd2" value="Re-Enter" />
</p:column>
</p:row>
</c:if>
<p:row>
<p:column>
<h:outputLabel value="Title" />
</p:column>
<p:column>
<p:inputText value="#{userSettingBean.user.TITLE}" />
</p:column>
</p:row>
<p:row>
<p:column>
<h:outputLabel value="Degree" />
</p:column>
<p:column>
<p:inputText value="#{userSettingBean.user.DEGREE}" />
</p:column>
</p:row>
<p:row>
<p:column>
<h:outputLabel value="Name" />
</p:column>
<p:column>
<p:inputText id="firstname" value="#{userSettingBean.user.FIRST_NAME}"/>
<p:watermark for="firstname" value="Firstname" />
</p:column>
<p:column>
<p:inputText id="lastname" value="#{userSettingBean.user.LAST_NAME}"/>
<p:watermark for="lastname" value="Lastname" />
</p:column>
</p:row>
<p:row>
<p:column>
<h:outputLabel value="Birthday" />
</p:column>
<p:column>
<p:inputText value="#{userSettingBean.user.BIRTHDAY}"/>
</p:column>
</p:row>
<p:row>
<p:column>
<p:commandButton style="float: left;" value="Save" actionListener="#{userSettingBean.saveChanges}"/>
</p:column>
</p:row>
</p:panelGrid>
</p:tab>
<p:tab title="Contact">
<p:panelGrid>
<p:row>
<p:column>
<h:outputLabel value="Street Name" />
</p:column>
<p:column>
<p:inputText value="#{userSettingBean.user.STREET_NAME}"/>
</p:column>
</p:row>
<p:row>
<p:column>
<h:outputLabel value="Street No." />
</p:column>
<p:column>
<p:inputText value="#{userSettingBean.user.STREET_NO}"/>
</p:column>
</p:row>
<p:row>
<p:column>
<h:outputLabel value="ZIP" />
</p:column>
<p:column>
<p:inputText value="#{userSettingBean.user.ZIP}"/>
</p:column>
</p:row>
<p:row>
<p:column>
<h:outputLabel value="City" />
</p:column>
<p:column>
<p:inputText value="#{userSettingBean.user.CITY}"/>
</p:column>
</p:row>
<p:row>
<p:column>
<h:outputLabel value="State" />
</p:column>
<p:column>
<p:inputText value="#{userSettingBean.user.STATE}"/>
</p:column>
</p:row>
<p:row>
<p:column>
<h:outputLabel value="Country" />
</p:column>
<p:column>
<p:inputText value="#{userSettingBean.user.COUNTRY}"/>
</p:column>
</p:row>
<p:row>
<p:column>
<h:outputLabel value="Fixed Line" />
</p:column>
<p:column>
<p:inputText value="#{userSettingBean.user.FIXED_LINE}"/>
</p:column>
</p:row>
<p:row>
<p:column>
<h:outputLabel value="Mobil Phone" />
</p:column>
<p:column>
<p:inputText vlaue="#{userSettingBean.user.MOBILE_PHONE}"/>
</p:column>
</p:row>
<p:row>
<p:column>
<h:outputLabel value="Fax" />
</p:column>
<p:column>
<p:inputText value="#{userSettingBean.user.FAX}"/>
</p:column>
</p:row>
<p:row>
<p:column>
<p:commandButton style="float: left;" value="Save" actionListener="#{userSettingBean.saveChanges}"/>
</p:column>
</p:row>
</p:panelGrid>
</p:tab>
</p:tabView>
</h:form>
</ui:define>
</ui:composition>
</h:body>
</html>
【问题讨论】：