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https://issues.apache.org/jira/browse/WICKET-6575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16566471#comment-16566471
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Martin Grigorov commented on WICKET-6575:
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I guess the default precondition could be extended to check for HTML element
visibility: `$(el).is(':visible')` or something similar.
> Ajax requests are still firing even when placeholder tag is written only
> ------------------------------------------------------------------------
>
> Key: WICKET-6575
> URL: https://issues.apache.org/jira/browse/WICKET-6575
> Project: Wicket
> Issue Type: Improvement
> Components: wicket
> Affects Versions: 8.0.0
> Reporter: Sven Meier
> Assignee: Sven Meier
> Priority: Minor
>
> Wicket JavaScript has a default precondition, that prevents Ajax requests
> from being fired, should the component no longer be on the page.
> If a component is not visible, but nevertheless is writing a placeholder tag,
> the request is still fired. This results in a
> ListenerInvocationNotAllowedException and redirect to an access denied page.
> Wicket could add some magic to prevent this from happening.
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