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https://issues.apache.org/jira/browse/WICKET-6840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17214270#comment-17214270
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Sven Meier commented on WICKET-6840:
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[~mgrigorov] I'd rather not go back to the previous solution, since I'm quite
happy how the restructuring in WICKET-6703 worked out.
I've pushed a change that allows components and behaviors to prepend JS again
in the before-render-phase.
I had to change AjaxIndicatorAppender though - since Behavior#beforeRender() is
actually called too late (during rendering) and overriding #onConfigure()
instead.
[~roncruz] Please attach another test-case for your problem with the charting
library IF it has something to do with #prependJavaScript(). Otherwise open a
new issue. Thanks!
> Busy indicator persists after request
> -------------------------------------
>
> Key: WICKET-6840
> URL: https://issues.apache.org/jira/browse/WICKET-6840
> Project: Wicket
> Issue Type: Bug
> Components: wicket-core, wicket-extensions
> Affects Versions: 9.0.0, 9.1.0
> Environment: Linux - Ubuntu 19.10 and centOS. Using OpenJDK 14.
> Reporter: Ronald Cruz
> Assignee: Martin Tzvetanov Grigorov
> Priority: Minor
> Attachments: test_proj.zip
>
>
> The busy indicator (implementations of `IAjaxIndicatorAware`) appears to
> persist after the AJAX request finishes. To be precise, It looks like it's
> not being properly cleaned up, as subsequent requests continue to add new
> indicators to the page. This looks to be new in Wicket 9/9.1, as I didn't
> observe the behavior in the past (Wicket 7/8) out of the box.
> I've seen this occur with uses of `IndicatingAjaxLink.java` along with
> ModalWindow/ModalDialog, but also for use cases of the vanilla
> `AjaxIndicatorAppender` behavior attached to a component.
> I've attached a small quickstart project which should hopefully make this
> easy to reproduce. It should suffice to start the project and click any of
> the two links present.
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