我可以让JSF2跳过呈现我的自定义标签而不修改标签本身吗? [英] Can I make JSF2 skip rendering my custom tag without modifying the tag itself?

问题描述

我已经使用 BalusC的模板开始了我自己的自定义标记处理程序(纯XHTML，没有Renderer)，我们称之为bean:input-典型的标签，输入，消息三重奏.它是这样使用的:

I've started my own custom taghandler (pure XHTML, no Renderer) using BalusC's template, let's call it bean:input - the typical label, input, message trio. It's used like this:

<h:panelGrid columns="3">
   <bean:input label="input1:" bean="#{bean1}" property="name" />
   <bean:input label="input2:" bean="#{bean2}" property="name" />
   <bean:input label="input3:" bean="#{bean3}" property="name" />
</h:panelGrid>

麻烦的是，输入是互斥的(即，应仅显示其中之一).显示的是哪个输入是在渲染时由view参数确定的.我该怎么做?

Trouble is, the inputs are mutually exclusive (ie, only one of them should appear). Which input is shown is determined at render time by a view parameter. How do I do this?

我不能使用<ui:fragment>，因为这会弄乱panelGrid，在标签上指定rendered="false"无效，我有点犹豫将标签实现包装在大的<c:if test="#{rendered}">中-是否在那里更好/内置的方法来告诉JSF，它应该只跳过呈现此特定标记?

I can't use <ui:fragment> as this would mess up the panelGrid, specifying rendered="false" on the tag had no effect and I kind of hesitate to wrap my tag implementation in a big <c:if test="#{rendered}"> - is there a better/builtin way to tell JSF it should simply skip rendering this specific tag?

注意:当我通过部分更新重新渲染网格时，<c:if>标记会做一些有趣的事情(例如，渲染不应渲染的标签，而不是相应的输入框).将rendered属性添加到组件本身即可解决此问题.

Note: the <c:if> tag does funny things (like rendering a label that shouldn't be rendered, but not the corresponding input box) when I re-render the grid with a partial update. Adding the rendered attribute to the components themselves fixes that.

推荐答案

在标签文件中添加对rendered属性的支持，然后将其重新应用于标签文件的内容.

Add support for rendered attribute to the tag file and re-apply it on tag file's contents.

<bean:input label="input1:" bean="#{bean1}" property="name" rendered="..." />

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我有点犹豫是否将标签实现包装在大型<c:if test="#{rendered}">

这可能很难看，但是是的.

It's maybe ugly, but yes that's a way.

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