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https://issues.apache.org/jira/browse/TAP5-2391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14484245#comment-14484245
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Dimitris Zenios commented on TAP5-2391:
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It has reverted back to using control name as the key for validation
tracker.Control name is generated from the client id of the component which if
simple id is set to true then in an ajax request it will not change.
This results in the same id being used on rendering and on submission.
> Field-specific error not shown when AJAX used
> ---------------------------------------------
>
> Key: TAP5-2391
> URL: https://issues.apache.org/jira/browse/TAP5-2391
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.4
> Reporter: Geoff Callender
> Assignee: Howard M. Lewis Ship
> Priority: Blocker
> Labels: 54_release_prerequisite
> Fix For: 5.4
>
>
> Found this bug in 5.4-beta-22. I've confirmed that the bug was not present in
> 5.4-beta-6.
> When an error is recorded with Form.recordError(Field field, String
> errorMessage) or ValidationTracker.recordError(Field field, String
> errorMessage) it normally is shown in the UI by decorating the field in error
> and displaying the errorMessage below it.
> In 5.4-beta-6 and every release ever before that, that was the behaviour
> regardless of whether the request is non-AJAX or AJAX.
> In 5.4-beta-22, the behaviour changes when the request is AJAX: the field
> does not display an error. That is, the field is *not* decorated and the
> errorMessage is *not* shown with it. If your Errors component has
> globalOnly="true", which is the norm these days, then you won't even see the
> error message there! If you set globalOnly="false" then the message *is*
> shown, but who would want to set globalOnly="false"???
> Comparing the HTTP responses of beta-22 with beta-6, I see that beta-6 had an
> extra entry in the inits, like this:
> ["t5/core/fields:showValidationError", "firstName_8cf3108fe0ece9", "First
> Name must not be Acme."]
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