[wp-trac] [WordPress Trac] #42750: Javascript breaks in some backend pages

[WordPress Trac]

#42750: Javascript breaks in some backend pages
-------------------------------+------------------------------
 Reporter:  viajarapie         |       Owner:
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  Awaiting Review
Component:  General            |     Version:  4.9
 Severity:  normal             |  Resolution:
 Keywords:  reporter-feedback  |     Focuses:  javascript
-------------------------------+------------------------------

Comment (by viajarapie):

 I only have the live site, I'd rather avoid deactivating anything.

 There are indeed errors in the console. For example, in the Post Editor I
 get this right after loading the page:


 mediaelement-and-player.min.js?ver=4.2.6-78496d1:12 Uncaught TypeError:
 Language code must have format 2-3 letters and. optionally, hyphen,
 underscore followed by 2 more letters
     at Object.s.language (mediaelement-and-
 player.min.js?ver=4.2.6-78496d1:12)
     at Object.o.5.15 (mediaelement-and-player.min.js?ver=4.2.6-78496d1:12)
     at i (mediaelement-and-player.min.js?ver=4.2.6-78496d1:12)
     at e (mediaelement-and-player.min.js?ver=4.2.6-78496d1:12)
     at mediaelement-and-player.min.js?ver=4.2.6-78496d1:12
 mediaelement-migrate.min.js:1 Uncaught ReferenceError: MediaElementPlayer
 is not defined
     at mediaelement-migrate.min.js:1
     at mediaelement-migrate.min.js:1
 wp-mediaelement.min.js?ver=4.9.1:1 Uncaught TypeError:
 b(...).not(...).filter(...).mediaelementplayer is not a function
     at HTMLDocument.a (wp-mediaelement.min.js?ver=4.9.1:1)
     at i (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils
 ,jquery-ui-widget,quicktags,underscore,wp-ajax-response,jquery-color,wp-
 lists,suggest,jquery-ui-&load[]=core,jquery-ui-mouse,jquery-ui-
 sortable,backbone,wp-util,wp-backbone,media-models,moxiejs,plupload,wp-
 plupload&ver=4.9.1:2)
     at Object.fireWith [as resolveWith] (load-scripts.php?c=1&load
 []=jquery-core,jquery-migrate,utils,jquery-ui-widget,quicktags,underscore
 ,wp-ajax-response,jquery-color,wp-lists,suggest,jquery-ui-&load[]=core
 ,jquery-ui-mouse,jquery-ui-sortable,backbone,wp-util,wp-backbone,media-
 models,moxiejs,plupload,wp-plupload&ver=4.9.1:2)
     at Function.ready (load-scripts.php?c=1&load[]=jquery-core,jquery-
 migrate,utils,jquery-ui-widget,quicktags,underscore,wp-ajax-response
 ,jquery-color,wp-lists,suggest,jquery-ui-&load[]=core,jquery-ui-mouse
 ,jquery-ui-sortable,backbone,wp-util,wp-backbone,media-
 models,moxiejs,plupload,wp-plupload&ver=4.9.1:2)
     at HTMLDocument.K (load-scripts.php?c=1&load[]=jquery-core,jquery-
 migrate,utils,jquery-ui-widget,quicktags,underscore,wp-ajax-response
 ,jquery-color,wp-lists,suggest,jquery-ui-&load[]=core,jquery-ui-mouse
 ,jquery-ui-sortable,backbone,wp-util,wp-backbone,media-
 models,moxiejs,plupload,wp-plupload&ver=4.9.1:2)


 Then a while later I get this other:

 load-scripts.php?c=1&load[]=hoverIntent,common,admin-bar,jquery-ui-
 position,wp-pointer,thickbox,shortcode,media-upload,heartbeat,autosave
 ,jquery-query,admin&load[]=-comments,postbox,jquery-ui-menu,wp-a11y
 ,jquery-ui-autocomplete,tags-suggest,tags-box,word-count,post,editor-
 expand,media-editor&load[]=,media-audiovideo,mce-view,imgareaselect,image-
 edit,svg-painter,wp-auth-check,jquery-ui-draggable,jquery-ui-slider
 ,jquery-touch-&load[]=punch,iris,wp-color-picker,editor,wplink,wp-
 embed&ver=4.9.1:647 Uncaught TypeError: Cannot read property 'hasClass' of
 undefined
     at HTMLDocument.<anonymous> (load-
 scripts.php?c=1&load[]=hoverIntent,common,admin-bar,jquery-ui-position,wp-
 pointer,thickbox,shortcode,media-upload,heartbeat,autosave,jquery-
 query,admin&load[]=-comments,postbox,jquery-ui-menu,wp-a11y,jquery-ui-
 autocomplete,tags-suggest,tags-box,word-count,post,editor-expand,media-
 editor&load[]=,media-audiovideo,mce-view,imgareaselect,image-edit,svg-
 painter,wp-auth-check,jquery-ui-draggable,jquery-ui-slider,jquery-
 touch-&load[]=punch,iris,wp-color-picker,editor,wplink,wp-
 embed&ver=4.9.1:647)
     at HTMLDocument.dispatch (load-scripts.php?c=1&load[]=jquery-core
 ,jquery-migrate,utils,jquery-ui-widget,quicktags,underscore,wp-ajax-
 response,jquery-color,wp-lists,suggest,jquery-ui-&load[]=core,jquery-ui-
 mouse,jquery-ui-sortable,backbone,wp-util,wp-backbone,media-
 models,moxiejs,plupload,wp-plupload&ver=4.9.1:3)
     at HTMLDocument.r.handle (load-scripts.php?c=1&load[]=jquery-core
 ,jquery-migrate,utils,jquery-ui-widget,quicktags,underscore,wp-ajax-
 response,jquery-color,wp-lists,suggest,jquery-ui-&load[]=core,jquery-ui-
 mouse,jquery-ui-sortable,backbone,wp-util,wp-backbone,media-
 models,moxiejs,plupload,wp-plupload&ver=4.9.1:3)
     at Object.trigger (load-scripts.php?c=1&load[]=jquery-core,jquery-
 migrate,utils,jquery-ui-widget,quicktags,underscore,wp-ajax-response
 ,jquery-color,wp-lists,suggest,jquery-ui-&load[]=core,jquery-ui-mouse
 ,jquery-ui-sortable,backbone,wp-util,wp-backbone,media-
 models,moxiejs,plupload,wp-plupload&ver=4.9.1:3)
     at Object.a.event.trigger (load-scripts.php?c=1&load[]=jquery-core
 ,jquery-migrate,utils,jquery-ui-widget,quicktags,underscore,wp-ajax-
 response,jquery-color,wp-lists,suggest,jquery-ui-&load[]=core,jquery-ui-
 mouse,jquery-ui-sortable,backbone,wp-util,wp-backbone,media-
 models,moxiejs,plupload,wp-plupload&ver=4.9.1:9)
     at HTMLDocument.<anonymous> (load-scripts.php?c=1&load[]=jquery-core
 ,jquery-migrate,utils,jquery-ui-widget,quicktags,underscore,wp-ajax-
 response,jquery-color,wp-lists,suggest,jquery-ui-&load[]=core,jquery-ui-
 mouse,jquery-ui-sortable,backbone,wp-util,wp-backbone,media-
 models,moxiejs,plupload,wp-plupload&ver=4.9.1:3)
     at Function.each (load-scripts.php?c=1&load[]=jquery-core,jquery-
 migrate,utils,jquery-ui-widget,quicktags,underscore,wp-ajax-response
 ,jquery-color,wp-lists,suggest,jquery-ui-&load[]=core,jquery-ui-mouse
 ,jquery-ui-sortable,backbone,wp-util,wp-backbone,media-
 models,moxiejs,plupload,wp-plupload&ver=4.9.1:2)
     at a.fn.init.each (load-scripts.php?c=1&load[]=jquery-core,jquery-
 migrate,utils,jquery-ui-widget,quicktags,underscore,wp-ajax-response
 ,jquery-color,wp-lists,suggest,jquery-ui-&load[]=core,jquery-ui-mouse
 ,jquery-ui-sortable,backbone,wp-util,wp-backbone,media-
 models,moxiejs,plupload,wp-plupload&ver=4.9.1:2)
     at a.fn.init.trigger (load-scripts.php?c=1&load[]=jquery-core,jquery-
 migrate,utils,jquery-ui-widget,quicktags,underscore,wp-ajax-response
 ,jquery-color,wp-lists,suggest,jquery-ui-&load[]=core,jquery-ui-mouse
 ,jquery-ui-sortable,backbone,wp-util,wp-backbone,media-
 models,moxiejs,plupload,wp-plupload&ver=4.9.1:3)
     at Object.<anonymous> (load-scripts.php?c=1&load[]=hoverIntent,common
 ,admin-bar,jquery-ui-position,wp-pointer,thickbox,shortcode,media-
 upload,heartbeat,autosave,jquery-query,admin&load[]=-comments,postbox
 ,jquery-ui-menu,wp-a11y,jquery-ui-autocomplete,tags-suggest,tags-box,word-
 count,post,editor-expand,media-editor&load[]=,media-audiovideo,mce-
 view,imgareaselect,image-edit,svg-painter,wp-auth-check,jquery-ui-
 draggable,jquery-ui-slider,jquery-touch-&load[]=punch,iris,wp-color-
 picker,editor,wplink,wp-embed&ver=4.9.1:357)


 This one repeats periodically.

 I'm now running WP4.9.1

--
Ticket URL: <https://core.trac.wordpress.org/ticket/42750#comment:2>
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