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https://issues.apache.org/jira/browse/TAP5-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13611682#comment-13611682
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Barry Books commented on TAP5-1618:
-----------------------------------
This would be a useful addition. The code needed to be a form field seems
complicated and very unTapestry like. Just having events instead of
ComponentActions would fix that.
> Component events "onValidate / onSuccess / onFailure"
> -----------------------------------------------------
>
> Key: TAP5-1618
> URL: https://issues.apache.org/jira/browse/TAP5-1618
> Project: Tapestry 5
> Issue Type: New Feature
> Components: tapestry-core
> Affects Versions: 5.3, 5.4
> Reporter: Jens Breitenstein
> Priority: Minor
> Labels: components, events
>
> Currently a compont is more or less something which just groups UI elements.
> Tapestry should give components a chance to take full responsibility for all
> UI elements it contains including setup, validation and storage. On the one
> hand we can pre-set values (like setting checkbox aso) via setupRender by
> reading a domain model but there is no way to store the values because a
> component is not getting events from the form. There are several methods like
> custom bindings, ComponentAction or calling component methods from the form
> (page class) to come around this issue, but this just looks like workarounds.
> In case components would provide optional methods for onValidate / onSuccess
> / onFailure (and become part of the form's events) it's possible to write
> standalone components which read a domain model and reflect changes to a
> domain model and even do cross checks between fields. This would increase
> component reusability to my personal opinion and create more solid units.
> Furthermore it easily allows handling of data which is not stored as simple
> attributes (eg bitfield which is mapped to multiple checkboxes and needs
> conversion in setupRender / onSuccess).
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