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https://issues.apache.org/jira/browse/WICKET-5104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13625780#comment-13625780
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Martin Grigorov commented on WICKET-5104:
-----------------------------------------
Sven: can you reproduce the issue ?
org.apache.wicket.Component#renderHead(HtmlHeaderContainer) checks whether the
component is visible(InHierarchy) and only then calls behavior#renderHead().
As I said earlier neither
org.apache.wicket.ajax.AbstractAjaxTimerBehavior#renderHead() nor
org.apache.wicket.ajax.AbstractAjaxTimerBehavior#stop() is called here.
Please put breakpoints in these methods and attach/paste the stacktraces.
> AjaxSelfUpdatingTimerBehavior in hidden component in ModalWindow causes Ajax
> Response Error
> -------------------------------------------------------------------------------------------
>
> Key: WICKET-5104
> URL: https://issues.apache.org/jira/browse/WICKET-5104
> Project: Wicket
> Issue Type: Bug
> Affects Versions: 6.3.0, 6.6.0
> Reporter: Marios Skounakis
> Assignee: Martin Grigorov
> Attachments: 5104.zip, fix-WICKET-5104.patch
>
>
> I have a ModalWindow which shows a panel with a hidden label with an
> AjaxSelfUpdatingTimerBehavior. When the modal window is shown, the following
> error occurs in the Wicket Ajax Debug console:
> ERROR: Wicket.Ajax.Call.processEvaluation: Exception evaluating javascript:
> TypeError: Cannot read property 'label5' of undefined, text:
> (function(){clearTimeout(Wicket.TimerHandles['label5']); delete
> Wicket.TimerHandles['label5'];})();
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