访问< ui:insert>的name属性 [英] Acessing the name attribute of a <ui:insert>

问题描述

我有一个带有标题和副标题的JSF模板:

I have a JSF template with the a title and a subtitle :

<h3><ui:insert name="title"/></h3>
<hr/>
<h5><ui:insert name="subtitle"/></h5>

使用此模板的所有页面都有标题，但不总是带有字幕:

All the pages using this template have title, but not always a subtitle :

<ui:define name="title">My Title with no subtitle</ui:define>

没有字幕时，我不想有<hr/>标记.因此，我真正想做的是检查subtitle是否为空，如果是，则忽略代码块.像这样的东西:

When there is no subtitle I don't want to have a <hr/> tag. So what I really want to do is check if subtitle is empty, if yes, ignore the block of code. Something like that :

<h3><ui:insert name="title"/></h3>
<c:if test="#{not empty subtitle}">
    <hr/>
    <h5><ui:insert name="subtitle"/></h5>
<c:if>

但是<c:if test="#{not empty subtitle}">当然不起作用.我不知道如何访问subtitle变量的值.

But of course <c:if test="#{not empty subtitle}"> doesn't work. I don't know how to access the value of the subtitle variable.

有什么主意吗?

谢谢

推荐答案

最接近的方法是将字幕定义为<ui:param>.

Closest what you can get is to define the subtitle as an <ui:param> instead.

因此

<ui:define name="title">My Title with a subtitle</ui:define>
<ui:param name="subtitle" value="A subtitle" />

使用

<h3><ui:insert name="title"/></h3>
<ui:fragment rendered="#{not empty subtitle}">
    <hr/>
    <h5>#{subtitle}</h5>
</ui:fragment>

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