Facelets自定义标签未呈现 | Facelets自定义标签未呈现

本文介绍了Facelets自定义标签未呈现的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在尝试使用Facelets创建一个自定义标签，但该标签无法呈现(即该标签在响应中显示为未替换).

I am trying to create a custom tag with Facelets but it isn't rendering (i.e. the tag appears unreplaced in the response).

标记(/WEB-INF/facelets/tags/inputThumbnailSelector.xhtml):

The tag (/WEB-INF/facelets/tags/inputThumbnailSelector.xhtml):

<html 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"
   xmlns:t="http://myfaces.apache.org/tomahawk">

<ui:composition>
 <div style="position: relative;">
  <img style="position: absolute; left: 0; top: 0;" src="#{image}"/>
  <div class="thumbnail-selector" style="position: absolute; left: #{backingBean.thumbnailLeft}; top: #{backingBean.thumbnailTop};"/>
 </div>
</ui:composition>

</html>

/WEB-INF/facelets/tags/panayk.taglib.xml:

<!DOCTYPE facelet-taglib PUBLIC "-//Sun Microsystems, Inc.//DTD Facelet Taglib 1.0//EN" "http://java.sun.com/dtd/facelet-taglib_1_0.dtd">

<facelet-taglib>
 <namespace>http://panayk.endofinternet.org/jsf</namespace>
 <tag>
  <tag-name>inputThumbnailSelector</tag-name>
  <source>inputThumbnailSelector.xhtml</source>
 </tag>
</facelet-taglib>

我的web.xml包含:

My web.xml contains:

<context-param>
 <param-name>javax.faces.FACELETS_LIBRARIES</param-name>
 <param-value>/WEB-INF/facelets/tags/panayk.taglib.xml</param-value>
</context-param>

这是标签的调用方式:

<!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:f="http://java.sun.com/jsf/core"
   xmlns:h="http://java.sun.com/jsf/html"
   xmlns:ui="http://java.sun.com/jsf/facelets"
   xmlns:t="http://myfaces.apache.org/tomahawk"
   xmlns:my="http://panayk.endofinternet.org/jsf">

<ui:composition template="/layout/layout.xhtml">
...
   <my:inputThumbnailSelector image="${facesContext.externalContext.requestContextPath}/image/get.servlet?id=1"
            backingBean="#{entryHandler}"/>
...
</ui:composition>

</html>

非常感谢！

推荐答案

我在这里找到了答案: https ://community.oracle.com/thread/1719525

I found my answer here: https://community.oracle.com/thread/1719525

上下文参数javax.faces.FACELETS_LIBRARIES应该替换不推荐使用(根据JSF规范不推荐使用)的上下文参数facelets.LIBRARIES.如果使用后者，则在服务器启动期间日志中会显示一条警告，提示已弃用facelets.LIBRARIES，而应改用javax.faces.FACELETS_LIBRARIES.但是我认为这仅用于记录警告，即名称facelets.LIBRARIES仍用于构建自定义taglib组件.我说这不是100％正确，因为它应该与新的参数名称一起使用.还有其他一些具有新名称的参数，但我尚未对其进行测试.

The context param javax.faces.FACELETS_LIBRARIES is supposed to replace the deprecated (deprecated as per JSF specification) context param facelets.LIBRARIES. When the latter is used there is a warning in the logs during server startup saying facelets.LIBRARIES is deprecated and javax.faces.FACELETS_LIBRARIES should be used instead. But I think this is only used for logging a warning, i.e. still the name facelets.LIBRARIES is used to build custom taglib components. I'm saying this is not 100% correct because it should work with the new parameter name. There are other parameters which have got new names, but I didn't test them yet.

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