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https://issues.apache.org/jira/browse/WICKET-6148?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Grigorov resolved WICKET-6148.
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Resolution: Fixed
> Remove AjaxEventBehavior#onCheckEvent() before Wicket 8.0.0
> -----------------------------------------------------------
>
> Key: WICKET-6148
> URL: https://issues.apache.org/jira/browse/WICKET-6148
> Project: Wicket
> Issue Type: Task
> Components: wicket
> Reporter: Martin Grigorov
> Assignee: Martin Grigorov
> Priority: Minor
> Fix For: 8.0.0
>
>
> org.apache.wicket.ajax.AjaxEventBehavior#onCheckEvent() will throw an
> exception if the event name starts with 'on', e.g. 'onclick'.
> Since version 6.0.0 Wicket uses JavaScript based event registration and the
> prefix 'on' is actually wrong. It has been used for pre-1.5 versions for the
> attribute names.
> There are valid use cases where applications may use custom JS events with
> names which start with 'on', so Wicket should not prevent them.
> During the milestone release
> org.apache.wicket.ajax.AjaxEventBehavior#onCheckEvent() will throw exception
> to really make developers fix the WARN message they have ignored in Wicket
> 7.x.
> The method has 'protected' visibility, so it could be overridden by
> applications which need to use custom events with 'on' prefix in their name.
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