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https://issues.apache.org/jira/browse/TAPESTRY-2619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12625943#action_12625943
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Howard M. Lewis Ship commented on TAPESTRY-2619:
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Yep, that's the issue all right.
Because its going through a form.
The event doesn't get cancelled properly because of how the Form, the event
handler method, its return value, and the @Ajax ComponentEventResultProcessor
interact.
> Event Handler adds a new JSONObject to my JSONObject return
> -----------------------------------------------------------
>
> Key: TAPESTRY-2619
> URL: https://issues.apache.org/jira/browse/TAPESTRY-2619
> Project: Tapestry
> Issue Type: Bug
> Affects Versions: 5.0.14
> Reporter: Tobias Wehrum
> Priority: Critical
> Attachments: example.rar
>
>
> When trying to create an AJAX handler to process a form submit, instead of
> returning my JSONObject simply as " {"somekey":"somevalue"} ", it returns "
> {"somekey":"somevalue"}{} ", which is clearly an invalid JSON object. The {}
> seems to be added at
> org.apache.tapestry5.internal.services.AjaxComponentEventRequestHandler:108.
> See attached file for an example project showing this behavior.
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