JS: Failed to execute 'getComputedStyle' on 'Window': parameter is not of type 'Element'

javascript mediawiki typeerror visual-editor getcomputedstyle
OpenFox picture OpenFox · Mar 22, 2015 · Viewed 97k times · Source

In short: I am trying to understand the meaning of this TypeError: Failed to execute 'getComputedStyle' on 'Window': parameter 1 is not of type 'Element' The error appears while lunching Mediawiki's VisualEditor, as can be seen here:

http://www.wiki.org.il/index.php?title=new-page&veaction=edit

The error doesn't enables creating new pages or editing the wiki anonymously. However, with the use of a different skin the error disappears:

http://www.wiki.org.il/index.php/Main_Page?useskin=vector

The wiki runs on 1.25alpha.

Answer

Anish picture Anish · Apr 24, 2015

I had this same error showing. When I replaced jQuery selector with normal JavaScript, the error was fixed.

var this_id = $(this).attr('id');

Replace: 

getComputedStyle( $('#'+this_id)[0], "")

With:

getComputedStyle( document.getElementById(this_id), "")

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