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https://issues.apache.org/jira/browse/WICKET-6841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17215010#comment-17215010
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Martin Tzvetanov Grigorov commented on WICKET-6841:
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Thank you, [~svenmeier] !
> Evaluation order of dependent JS in Ajax request
> ------------------------------------------------
>
> Key: WICKET-6841
> URL: https://issues.apache.org/jira/browse/WICKET-6841
> Project: Wicket
> Issue Type: Bug
> Components: wicket-core
> Affects Versions: 9.0.0, 9.1.0
> Environment: Linux - Ubuntu 19.1, JDK 14
> Reporter: Ronald Cruz
> Assignee: Sven Meier
> Priority: Critical
> Fix For: 9.2.0
>
> Attachments: wicket-js-order.zip
>
>
> Starting in Wicket 9, an issue cropped up with how JS is evaluated when
> loaded through Ajax. It appears as though JS in the component is evaluated
> before the references in <wicket:head> or #renderHead() are resolved. This
> leads to initialization and reference errors in the first rendering if said
> JS in the component references the libraries in the header. Subsequent usages
> are fine as the referenced libraries are then cached.
> I'm not familiar with Wicket internals, but this to me seems related to what
> Martin brought up in
> [WICKET-6840|https://issues.apache.org/jira/browse/WICKET-6840]. The comment
> reads:
> "Before WICKET-6703 Wicket was using <prepend-evaluation> elements in the
> Ajax XML response, which were processed before any component replacement.
> After WICKET-6703 we use <header-contribution> for both prepend and append
> JS. With the change above the issue is worked around but the prepend JS
> contributed by AjaxIndicatorAppender is executed *after* the component
> replacements."
> I've attached a sample quickstart that is a simplified version of the
> charting issue I mentioned having in that ticket. It is a custom component
> that pulls a simple JS library in the header and calls it inline. The issue
> can be observed through the browser JS console when clicking the link.
>
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