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https://issues.apache.org/jira/browse/WICKET-4909?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesse Bonzo updated WICKET-4909:
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Attachment: windowOnBeforeUnloadFix.patch
This patch provides the desired behavior.
> ModalWindow overwrites window.onbeforeunload
> --------------------------------------------
>
> Key: WICKET-4909
> URL: https://issues.apache.org/jira/browse/WICKET-4909
> Project: Wicket
> Issue Type: Improvement
> Components: wicket-extensions
> Affects Versions: 6.3.0
> Reporter: Jesse Bonzo
> Priority: Minor
> Labels: ajax, event, javascript, modal, wicket
> Attachments: windowOnBeforeUnloadFix.patch
>
>
> If window.onbeforeunload is changed after a ModalWindow is opened the change
> is lost when the ModalWindow is closed. I expected calling
> ModalWindow#showUnloadConfirmation(false) would fix this, but the javascript
> for the modal window unconditionally overwrites window.onbeforeunload. I
> suggest checking settings.unloadConfirmation before overwriting
> window.onbeforeunload.
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