I am using velocity for my output and have found the component tags to be
useful. I have found, however, that I'm not quite sure about how the
velocity context and the value stack interact. Specifically, how can I get a
component directive to work cleanly with a variable that exists in the
velocity context?
An example of where this problem arises is if you want a particular
component to be displayed multiple times, once per iteration of a
collection. The proper way to iterate through a collection in velocity is
using the #foreach directive, as shown:
#foreach ($item in $myCollection)
$item.display
#end
The problem is if you want to use the object referenced by "$item" in the
example above as something to supply to a component using the velocity
version of the component tag.
#bodytag(Component "template=myTemplate.vm")
#param("param1" "HOW DO I PUT $item HERE?")
#end
If you just put "$item" in the value portion of the #param directive, it
looks like it just supplies the value of "$item.toString()" rather than the
reference to "$item" itself.
I've found a way that works, but it seems kludgey to me. I basically push
the "$item" object onto the stack, then pop it off. It makes for a bit more
code than I'd like, but it seems to work. Here's an example:
#foreach ($section in $currentPage.sections)
$stack.push($section)
#bodytag(Component "template=pageset/section.vm")
#param("section" "top")
#param("object" "currentObject")
#end
#set ($section = $stack.pop())
#end
I don't know how the velocity directives work exactly, but this is the kind
of thing that I would think would work a little nicer:
#bodytag(Component "template=pageset/section.vm")
#param("section" $section)
#param("object" $currentObject)
#end
Please tell me I'm making this more complicated, and that there's an easier
way!
Thanks,
Drew
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