The first thing to know about MediaWiki and JavaScript is that the site administrator can customize the wiki installation by simply modifying the article MediaWiki:Common.js
For instance, if you put the JavaScript code for wikEd in there, it will make the WikEd editor available to all users of the local wiki.
Debugging JavaScript
- Access the developer tools of your browser
- Chrome
CTRL + SHIFT + J - Firefox
CTRL + SHIFT + I
- Chrome
- Go to the console tab (look for errors)
- append
?debug=trueto the URL and reload the page. This will give you non-minified JavaScript.