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https://issues.apache.org/jira/browse/WICKET-2874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12871221#action_12871221
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Juergen Donnerstag commented on WICKET-2874:
--------------------------------------------
Though possible, it requires modifications to the API which are not possible in
1.4.
Reason: onComponentTag() currently doesn't need the associated markup, thus it
is loaded during onComponentTagBody. We'd need to change the code to read the
associated markup in onComponentTag(), store is locally and re-use it during
onComponentTagBody() to be efficient.
But I think I have a workaround for you:
src/test/.../PanelWithAttributeModifier.java shows that you can add an
AttributeModifier to the Panel within the Panel's constructor - which makes it
Panel specific -, which during rendering modifies the Panel opening <div> tag.
You could further refine that if you'd put the following snippet in your Panel
construtor, which loads the associated markup and does some sanity tests. The
result is the <wicket:panel> ComponentTag. The ComponentTag in turn provides
you the attributes which your AM would add to the <div> tag.
Obviously these Panels would read the Markup twice, which is not very
desireable. It's probably not a big performance impact because of caching, but
...
final MarkupStream associatedMarkupStream =
getAssociatedMarkupStream(true);
// skip until the targetted tag is found
associatedMarkupStream.skipUntil(openTagName);
// Get open tag in associated markup of border component
MarkupElement elem = associatedMarkupStream.get();
if ((elem instanceof ComponentTag) == false)
{
associatedMarkupStream.throwMarkupException("Expected
the open tag. " +
exceptionMessage);
}
ComponentTag associatedMarkupOpenTag = (ComponentTag)elem;
// Check for required open tag name
if (!((associatedMarkupOpenTag != null) &&
associatedMarkupOpenTag.isOpen() && (associatedMarkupOpenTag instanceof
WicketTag)))
{
associatedMarkupStream.throwMarkupException(exceptionMessage);
}
> Copy attributes from wicket:panel to source tag
> -----------------------------------------------
>
> Key: WICKET-2874
> URL: https://issues.apache.org/jira/browse/WICKET-2874
> Project: Wicket
> Issue Type: New Feature
> Components: wicket
> Affects Versions: 1.4.7
> Reporter: Maarten Billemont
>
> When I have a page like so:
> {code}
> <div wicket:id="content" />
> {code}
> And two types of panels that could go in there, that should have different
> styling, I'm currently stuck using a pointless extra div:
> {code}
> <wicket:panel>
> <div class="style1">
> Content 1
> </div>
> </wicket:panel>
> {code}
> If wicket allows copying attributes on from the wicket:panel tag to the
> source tag of the panel; this would become a lot cleaner and neater:
> {code}
> <wicket:panel class="style1">
> Content 1
> </wicket:panel>
> {code}
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