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https://issues.apache.org/jira/browse/WICKET-5469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13867819#comment-13867819
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Jonas commented on WICKET-5469:
-------------------------------
As a workaround, it is possible to assign an empty function to
window.onbeforeunload, e.g.
target.appendJavaScript("window.onbeforeunload = function() {};");
before calling ModalWindow.show(AjaxRequestTarget)
> ModalWindow unload warning always displayed (even if window is closed)
> ----------------------------------------------------------------------
>
> Key: WICKET-5469
> URL: https://issues.apache.org/jira/browse/WICKET-5469
> Project: Wicket
> Issue Type: Bug
> Components: wicket-extensions
> Affects Versions: 6.13.0
> Reporter: Jonas
> Priority: Minor
>
> The fix applied for WICKET-4909 seems to be bad:
> If there's a ModalWindow with showUnloadConfirmation == true (java) and
> window.onbeforeunload == null (javascript), the warning message ('Reloading
> this page will cause the modal window to disappear') is always displayed,
> even if the ModalWindow was closed.
> The fix for WICKET-4909 should probably take the showUnloadConfirmation flag
> into account.
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