[jsr-314-open] minor feature enhancement for Facelets/VDL
I just thought of a feature I have often needed in Facelets that perhaps we
can weave into the VDL. It would be nice to know if a named template has
been defined inside the master template. Consider the following example:
page.xhtml
<ui:composition template="/WEB-INF/template.xhtml" ...>
<ui:param name="title" value="VDL Template Page"/>
<ui:define name="content">
<h:outputText value="Hello World" />
</ui:define>
</ui:composition>
template.xhtml
<html ...>
<h:head>
<title>#{not empty title ? title : 'My Site'}</title>
</h:head>
<body>
<div id="container">
<ui:insert name="content"/> <- how do I know if it has
been
defined?
</div>
</body>
</html>
Since the <ui:param> creates a regular variable, I can check whether it is
empty or not. But I do not have a way to check if the named template
"content" has been defined. Of course, I can nest default content within the
<ui:insert>, which is used when the named template is not defined, but there
are cases when I simply need to know whether or not it is defined. Could we
come up with some way to check if it is defined?
-Dan
--
Dan Allen
Senior Software Engineer, Red Hat | Author of Seam in Action
http://mojavelinux.com
http://mojavelinux.com/seaminaction
http://in.relation.to/Bloggers/Dan
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