尽管存在依赖关系，PrimeFaces组件不会在浏览器中呈现 [英] PrimeFaces components are not rendered in browser in spite of dependency being present
问题描述
我不知道我是否配置了一切正确。 PrimeFaces JAR至少在 / WEB-INF / lib 内：
PrimeFaces XML命名空间被声明为 xmlns：p =http：\\primefaces.org\ui
我映射了 FacesServlet 在 *。xhtml ：
以下是 login.xhtml的完整源代码：
<！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
xmlns：p =http://primefaces.org/ui>
< h：body>
< h：head>< title>登录页面< / title>< / h：head>
< h：form>
< p：panel id =panelheader =登录面板style =margin-bottom：10px;>
< h：panelGrid columns =3>
< h：outputLabel value =User Id：/>
< p：inputText id =idvalue =loginBean.idrequired =truerequiredMessage =需要ID/>
< p：message for =id/>
< p：outputLabel value =用户名：/>
< p：inputText id =namevalue =loginBean.namerequired =truerequiredMessage =需要名称/>
< p：message for =name/>
< / h：panelGrid>
< / p：panel>
< p：commandButton type =Submitvalue =Submitaction =＃style =margin-right：20px; />
` / p>
输出如下所示：
如你所见，< h：outputText> 做了它的工作，但没有一个< p：xxx> 出现。原因如何，如何解决？
关于您的具体问题的原因，PrimeFaces组件未被呈现根据屏幕截图，您在PrimeFaces taglib URI中有一个前导空格：
xmlns：p =http：// $
这很重要，因此错了。摆脱它：
xmlns：p =http://primefaces.org/ui
这样，PrimeFaces组件必须被解析并显示在HTML输出中。
对于其余的，我强烈建议您先阅读一个理智的JSF2教程。你制作了几个概念上的错误，这些错误已经被一个体面的Hello World示例所覆盖。从我们的JSF wiki页面开始。不过，这些错误不是有这个空白页。它们会导致不同的问题（例如，CSS / JS不起作用，表单提交不起作用）。如果你仍然坚持下去，你应该主要提出一个新的问题。
I'm developing a JSF web application with PrimeFaces 3.5 on Eclipse 4.3. There are no compiletime or runtime errors and the application deploys successfully. However, I cannot get the desired output in browser. The PrimeFaces components do not show up, while the standard JSF components do.
I'm not sure if I configured everything right. The PrimeFaces JAR is at least inside /WEB-INF/lib:
And the PrimeFaces XML namespace is declared as xmlns:p="http:\\primefaces.org\ui"
And I mapped the FacesServlet on *.xhtml:
Here's the full source code of login.xhtml:
<!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"
xmlns:p=" http://primefaces.org/ui" >
<h:body>
<h:head ><title>Login Page !!</title></h:head>
<h:form>
<p:panel id="panel" header="Login Panel" style="margin-bottom:10px;">
<h:panelGrid columns="3">
<h:outputLabel value="User Id:" />
<p:inputText id="id" value="loginBean.id" required="true" requiredMessage="ID required"/>
<p:message for="id" />
<p:outputLabel value="User Name:" />
<p:inputText id="name" value="loginBean.name" required="true" requiredMessage="Name required" />
<p:message for="name" />
</h:panelGrid>
</p:panel>
<p:commandButton type="Submit" value="Submit" action="#" style="margin-right:20px;" />
`
The output looks like this:
As you see, <h:outputText> did its job, but none of <p:xxx> show up. How is this caused and how can I solve it?
As to the cause of your concrete problem of PrimeFaces components not being rendered, as per the screenshot, you have a leading blank space in PrimeFaces taglib URI:
xmlns:p=" http://primefaces.org/ui"
This is significant and thus wrong. Get rid of it:
xmlns:p="http://primefaces.org/ui"
This way the PrimeFaces components must be parsed and appear in the HTML output.
For the remainder I strongly recommend you to go through a sane JSF2 tutorial first. You're making several conceptual mistakes which are already covered by a decent Hello World example. Start at our JSF wiki page. Those mistakes do however not have this "blank page" as consequence. They will cause different problems (e.g. CSS/JS not functioning and form submit not working). If you still stucks on that, you should essentially be asking a new question.
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