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https://issues.apache.org/jira/browse/WICKET-1937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12654192#action_12654192
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Juergen Donnerstag commented on WICKET-1937:
--------------------------------------------
Enclosue is a rather generic component which avoids that you need to create a
large number of tiny, but different, components. That doesn't seem to be true
in your case. You describe it as something you need more often. Hence creating
a new panel component which serves your purpose is the way to go, rather than
enhancing enclosure with something that is only useful for lists.
> Enclosure with fallback section
> -------------------------------
>
> Key: WICKET-1937
> URL: https://issues.apache.org/jira/browse/WICKET-1937
> Project: Wicket
> Issue Type: Wish
> Components: wicket
> Reporter: Peter Parson
> Priority: Minor
> Fix For: 1.5-M1
>
>
> Enclosures would be even more useful, if a "fallback section" could be
> defined which is displayed only when the enclosure is not displayed.
> This way, an explanatory message like "No items in this list" or similar
> could be displayed quite easily.
> e.g.
> <wicket:enclosure child="someList">
> <div wicket:id="someList">
> <!-- ... markup of element someList (which sets its own visibility to false
> if empty) ... -->
> </div>
> <wicket:fallback>
> Sorry - nothing to display here. <!-- this message would only appear if the
> list is empty -->
> </wicket:fallback>
> </wicket:enclosure>
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