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https://issues.apache.org/jira/browse/WICKET-6840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17213736#comment-17213736
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Martin Tzvetanov Grigorov commented on WICKET-6840:
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The problem starts with:
https://issues.apache.org/jira/browse/WICKET-6703?focusedCommentId=16962037&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16962037
Now org.apache.wicket.page.PartialPageUpdate#writeTo() writes the prepend
evaluations and then the components. But Component/Behavior #beforeRender and
#renderHead() are part of PartialPageUpdate#writeComponents() and if they use
something like:
{code:java}
component.getRequestCycle().find(IPartialPageRequestHandler.class).ifPresent(target
-> {
final String javascript = "var e = Wicket.$('" + getMarkupId() +
"'); if (e != null && typeof(e.parentNode) != 'undefined')
e.parentNode.removeChild(e);";
target.prependJavaScript(javascript);
}); {code}
as AjaxIndicatorAppender does then it is just ignored.
> 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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