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https://issues.apache.org/jira/browse/TAPESTRY-2174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12573100#action_12573100
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Ulrich Stärk commented on TAPESTRY-2174:
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There are at least two ways to have a part of the form only displayed and
validated if some condition (like a checked Checkbox) is met, each requiring
the user to set up a complex interaction of components and listener methods. As
I believe that this requirement is quite common I think it is a good thing to
have out of the box.
If this doesn't belong into core I can live with it being in contrib :-)
> Backport T5's FormFragment to T4.1
> ----------------------------------
>
> Key: TAPESTRY-2174
> URL: https://issues.apache.org/jira/browse/TAPESTRY-2174
> Project: Tapestry
> Issue Type: New Feature
> Components: Core Components
> Affects Versions: 4.1.5
> Reporter: Ulrich Stärk
> Fix For: 4.1.6
>
>
> I'm often working with forms that contain parts that should only be displayed
> and validated if some condition is met, e.g. the user checked a certain
> checkbox. It would be great to have such functionality bundled in just one
> component in T4.
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