https://bugzilla.wikimedia.org/show_bug.cgi?id=34538
Web browser: ---
Bug #: 34538
Summary: ext.vector.collapsibleNav does not initialise
correctly with
$wgResourceLoaderExperimentalAsyncLoading
Product: MediaWiki extensions
Version: any
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: Vector
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected],
[email protected]
Classification: Unclassified
Mobile Platform: ---
Created attachment 10048
--> https://bugzilla.wikimedia.org/attachment.cgi?id=10048
Flush and sleep in skins/Vector.php to give time for RL to finish before the
main document finishes loading
With $wgResourceLoaderExperimentalAsyncLoading enabled, modules are loaded from
the <head> rather than from the end of the <body>. This causes the modules to
be loaded simultaneously with the main HTML, and under certain conditions,
module execution may occur before the #mw-panel element appears in the DOM.
ext.vector.collapsibleNav in particular does not register a $(document).ready()
callback, it just tries to modify the DOM at the file level of the module. No
errors are logged, $( '#mw-panel' ) just returns an empty list and the styling
is not applied. Other modules may have similar issues with
$wgResourceLoaderExperimentalAsyncLoading.
Bug 34450 may possibly be related but there were a lot of issues mixed in there
without any reproduction procedure so I decided to file a new bug.
Whether or not you see the issue depends on the browser, page length, network
speed and cache timing details, but it's possible to reliably reproduce it by
slowing down page delivery with the attached flush/sleep patch, and setting
MW_NO_OUTPUT_BUFFER in LocalSettings.php:
define( 'MW_NO_OUTPUT_BUFFER', 1 );
Using that method, I can reproduce it every time in Firefox or Chrome.
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