[ https://issues.apache.org/jira/browse/WICKET-6841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17215647#comment-17215647 ]
Sven Meier commented on WICKET-6841: ------------------------------------ "You break it, you fix it!" Thanks [~roncruz] for reporting these issues. > 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. > -- This message was sent by Atlassian Jira (v8.3.4#803005)