Facelet 自定义组件 - 阻止渲染
阅读这个答案后，我仍然难住了。我同意应该避免使用 JSTL，并了解它的评估是如何在错误的阶段发生的。但是，根据facelets上的文档开发网站上，id 和 binding。因此，即使某些实现支持渲染，您似乎也会试图利用它。另一个建议是使用
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns:ice="http://www.icesoft.com/icefaces/component"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets">
<ui:composition>
<ice:selectOneListbox binding="#{binding}" rendered="#{modeExisting}">
<f:selectItems
value="#{binding.allTagsSelectItems}" />
</ice:selectOneListbox>
<ice:inputText binding="#{binding.name}" />
<ice:inputText binding="#{binding.description}" />
</ui:composition>
</html>
这基本上是一个列表框，用于选择具有名称和描述的元素，选择该元素后将允许用户编辑它们。我可以在块周围放置一个
另外，可能值得一提的是，我正在使用上面的自定义组件与这个facelet-taglib配对：
<?xml version="1.0"?>
<!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://www.mitre.org/asias/jsf</namespace>
<tag>
<tag-name>configurationTagEditor</tag-name>
<source>../component/configurationTagEditor.xhtml</source>
</tag>
<tag>
<tag-name>configurationTagSelector</tag-name>
<source>../component/configurationTagSelector.xhtml</source>
</tag>
<tag>
<tag-name>configurationTagRegexTable</tag-name>
<source>../component/configurationTagRegexTable.xhtml</source>
</tag>
</facelet-taglib>
为了允许我在我的jsf xhtml中使用它：
...
<ice:panelTab label="Existing" styleClass="configurationTagsExisting">
<m:configurationTagEditor tag="#{configuration.existingTag}" />
</ice:panelTab>
...
After reading this answer, I am still stumped. I agree that JSTL should be avoided and understand how its evaluation occurs in the wrong phase. However, per the documentation on the facelets development site, it appears that <ui:fragment> tags only supports two attributes, id and binding. So, even if some implementation support rendered, it seems like you would be tempting fate to make use of it. The other suggestion was to use <h:panelGroup>, however, that inserts a <div> element in the response which could cause undesirable side effects (like changing your content from inline to block). Does anyone know a way around this? In particular, I am attempting the following:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns:ice="http://www.icesoft.com/icefaces/component"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets">
<ui:composition>
<ice:selectOneListbox binding="#{binding}" rendered="#{modeExisting}">
<f:selectItems
value="#{binding.allTagsSelectItems}" />
</ice:selectOneListbox>
<ice:inputText binding="#{binding.name}" />
<ice:inputText binding="#{binding.description}" />
</ui:composition>
</html>
Which is basically a listbox used to select an element with a name and description which when selected will allow the user to edit them. I could put an <ice:panelGroup> around the block, and use the rendered attribute of it, but again, there could be side effects of injecting that additional div. Is there any way to make this work?
Also, it may be worth mentioning that I am using the above custom component paired with this facelet-taglib:
<?xml version="1.0"?>
<!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://www.mitre.org/asias/jsf</namespace>
<tag>
<tag-name>configurationTagEditor</tag-name>
<source>../component/configurationTagEditor.xhtml</source>
</tag>
<tag>
<tag-name>configurationTagSelector</tag-name>
<source>../component/configurationTagSelector.xhtml</source>
</tag>
<tag>
<tag-name>configurationTagRegexTable</tag-name>
<source>../component/configurationTagRegexTable.xhtml</source>
</tag>
</facelet-taglib>
To allow me to use this in my jsf xhtml:
...
<ice:panelTab label="Existing" styleClass="configurationTagsExisting">
<m:configurationTagEditor tag="#{configuration.existingTag}" />
</ice:panelTab>
...
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>默认情况下不渲染
。仅当您添加layout="block"时才会呈现。对于所有其他 HTML 属性（例如id、styleClass等），它仅呈现。如果没有layout属性存在并且所有其他 HTML 属性都不存在，则它不会呈现任何内容。The
<h:panelGroup>doesn't render a<div>by default. It only renders that if you addlayout="block". For all other HTML attributes (likeid,styleClass, etc), it only renders a<span>. If nolayoutattribute is present and all other HTML attributes are absent, it renders nothing.