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JSF-XHTML表单上的“未为名称定义标签:validateRequired”错误

[英]JSF - “no tag was defined for name: validateRequired” error on a XHTML form

我正在尝试创建一个表单,其中FirstName是提交表单所需的必填字段(一旦我能确定此错误的原因,将添加其他验证):

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html  
     PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xml:lang="en" lang="en"
  xmlns="http://www.w3.org/1999/xhtml" 
  xmlns:f="http://java.sun.com/jsf/core"
  xmlns:h="http://java.sun.com/jsf/html"
  xmlns:ui="http://java.sun.com/jsf/facelets">

    <h:head>
        <title>Register as a Voter</title>
    </h:head>
    <h:body>
Please fill out all information below to register as a voter.
<br/>
      <h:form id = "form" >



      <h:outputLabel value = "First Name:"/>

      <h:inputText value = "#{voterBean.firstName}">  
 <h:validateRequired/>
    </h:inputText>
<br/>

 <h:outputLabel value = "Last Name:"/> 
       <h:inputText value = "#{voterBean.lastName}"/>
<br/>


 <h:outputLabel value = "Address:"/> 
       <h:inputText value = "#{voterBean.address}"/>

<br/>
 <h:outputLabel value = "City:"/> 
       <h:inputText value = "#{voterBean.city}"/>
<br/>


 <h:outputLabel value = "State"/> 
       <h:inputText value = "#{voterBean.state}"/>
<br/>


 <h:outputLabel value = "Zip:"/> 
       <h:inputText value = "#{voterBean.zip}"/>
<br/>


 <h:outputLabel value = "Phone:"/> 
       <h:inputText value = "#{voterBean.phone}"/>
<br/>


 <h:outputLabel value = "Affiliation:"/> <br/>
      <h:selectOneRadio value="#{voterBean.affil}"><br/>
    <f:selectItem itemValue="Democrat" itemLabel="Democrat" />
    <f:selectItem itemValue="Green Party" itemLabel="Green Party" />
    <f:selectItem itemValue="Liberterian" itemLabel="Liberterian" />
<f:selectItem itemValue="Republican" itemLabel="Republican" />
<f:selectItem itemValue="Unafilliated" itemLabel="Unafilliated" />
</h:selectOneRadio>
<br/>


      <h:commandButton id = "Submit" value = "Submit" action = "Results"/>

      </h:form>

    </h:body>
</html>

但是,当我部署此代码并转到此xhtml文件时,出现错误提示

“ /Register.xhtml @ 24,23标记库支持名称空间: http : //java.sun.com/jsf/html ,但是未为名称定义标记:validateRequired”

我试图阅读有关stackoverflow上此错误的解决方案,但我不知道出了什么问题。

我相信我做得正确...

“ validateRequired”的标记与核心名称空间相关,而不与html相关。 将此前缀更改为此<f:validateRequired />应该可以解决此问题。
或者,您可以在输入组件标签中使用required="true" 他们两个都完成相同的任务。

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