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https://issues.apache.org/jira/browse/WICKET-3367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13154134#comment-13154134
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Martin Grigorov commented on WICKET-3367:
-----------------------------------------

Issuing several Wicket.Event.add(targetX, 'click', fn1), 
Wicket.Event.add(targetX, 'click', fn2), Wicket.Event.add(targetX, 'click', 
fn3), ... will execute all functions, not just the last one.
I see WicketTester as a problem here because it assumes that only one behavior 
per event type can exists. I'll create a task ticket for this functionality to 
make sure it is properly handled.

OK. I'm going to look in introducing the AjaxAttributes. 
                
> Rewrite all JavaScript inline event handlers to be proper attached event 
> handlers
> ---------------------------------------------------------------------------------
>
>                 Key: WICKET-3367
>                 URL: https://issues.apache.org/jira/browse/WICKET-3367
>             Project: Wicket
>          Issue Type: Improvement
>            Reporter: Igor Vaynberg
>             Fix For: 6.0.0
>
>         Attachments: WICKET-3367.patch
>
>
> Currently events added inside onclick, onsubmit attributes are problematic 
> because they cannot be cancelled by other event handlers that are attached to 
> events via javascript's addEventListener() and friends. We should extract all 
> such inlined handlers and attach them via our Wicket.Event api.

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