Extension:Javascript

Manage multiple JavaScript file imports from one place. The extension is a single script which you can obtain from here and save into a directory called JavaScript in your extensions directory and include in your LocalSettings.php file. Save all the necessary *.js files into the same locations as the script and they will automatically be loaded by your wiki.

Using an external script or scripts has several advantages to using MediaWiki:Common.js:

only people with access to the file system on the server can edit the script(s) or upload new version(s)
you can have as many scripts as you like, which facilitates modularization
users often find that it takes a while for updates to MediaWiki:Common.js to propagate to the client (browser). This can make developing and testing your script a frustrating experience. Updates to external scripts, on the other hand, tend to take effect on the client after a single force refresh. This is also the case using this extension.
editing MediaWiki:Common.js through the edit window in Mediawiki is cumbersome and error prone. External scripts can be edited in a proper editor with full screen text display, graphical syntax indication and feedback on errors. Of course you can copy MediaWiki:Common.js to an external location and edit it there, but this gives you essentially two versions to keep track of (even if one may be only temporary).
if your application requires much JavaScript, MediaWiki:Common.js may be edited very frequently. This takes up unnecessary space in your wiki's database. You avoid this using external scripts.

The original script has some issues. A revised version has been added to the Discussion page.

To activate the extension, include in your LocalSettings.php file as in the following example:

include("$IP/extensions/JavaScript/JavaScript.php");

See

Extension:Javascript

See alsoEdit