Common.js

MediaWiki:Common.js contains JavaScript that will be loaded for all users. Enter "MediaWiki:Common.js" into the search box of your wiki. It will tell you if the page doesn't exist; if so, and you have the necessary user rights, just create it with the code you need to execute. There are similar pages affecting only users of specific skins (see below).

If Template:Wg is set to true, users can customize the interface for themselves only by creating and importing personal scripts in user subpages with lowercase titles (see below). Extension:Gadgets makes it easier for site admins and users to share JavaScript, see Gadget kitchen.

This page covers the state and configuration variables available. For the general JavaScript API, see the JSDuck documentation.

List of JavaScript pages

Global scripts

MediaWiki:Common.js (all skins)
MediaWiki:skinname.js (per skin, for example MediaWiki:Vector.js)
MediaWiki:Group-group.js (per user group, for example MediaWiki:Group-sysop.js)
Special:Gadgets

Personal scripts

They're only available if Template:Wg is set to true.

User:Example/common.js (all skins - introduced in MW v1.17)
User:Example/skinname.js (per skin, for example User:Example/vector.js)

mw.config

To ease JavaScript programming, the MediaWiki software exposes a number of configuration values in an object called mw.config.

Note Most of these variables have a wg prefix.

For legacy reasons these names are exposed as global JavaScript variables if Template:Wg is true, so they use a prefix to avoid collisions.
A subset of these names correspond to $wg variables in PHP, but others are unrelated.
If your own JavaScript code references a config variable, make sure you express a module dependency on the module that supplies it.
Besides the names in this list, many extensions also set JavaScript config variables prefixed with 'wg'. To use those you need to express a module dependency and document that your code depends on the extension.

Site-wide

Name	Type	Description	Availability
`debug`	Boolean		Template:HiddensortMW 1.17+
`skin`	String	The internal name of the currently used skin. The "Classic" skin is called "standard".	Template:HiddensortMW <1.7 (monobook skin) MW 1.8+: all skins and pages
`stylepath`	String	Full URL to the root directory for skins, containing stylesheets and skin-specific scripts. The path does not contain the skin subdirectory, and is not terminated by a "/".	Template:HiddensortMW <1.7 (monobook skin) MW 1.8+: all skins and pages
`wgActionPaths`	Object	See $wgActionPaths. The value is either an empty object, or otherwise has entries for each defined actionpath of the form `'action' : 'path'`. So `wgActionPaths['edit']` will return the "pretty path" for the edit action, if any is defined.	Template:HiddensortMW 1.13+
`wgArticlePath`	String	Local path, starting at the root, to reference articles, containing a "$1" placeholder that may be replaced by a page title to get a valid URL to that page. Given a valid page title `title`, a valid URL may be constructed using `wgArticlePath.replace('$1', title)`. See also $wgArticlePath.	Template:HiddensortMW 1.8+
`wgAvailableSkins`	Object		Template:HiddensortMW 1.18+ (Cite error: Invalid `<ref>` tag; name cannot be a simple integer. Use a descriptive title)
`wgCaseSensitiveNamespaces`	Array		Template:HiddensortMW 1.18+ (Cite error: Invalid `<ref>` tag; name cannot be a simple integer. Use a descriptive title)
`wgContentLanguage`	String	The language code for the default content language of the wiki.	Template:HiddensortMW 1.8+
`wgContentNamespaces`	Array of integers	The IDs of the namespaces considered "content namespaces" by MediaWiki. Equivalent to the value of the `$wgContentNamespaces` configuration variable, with `0` included if it is not already.	Template:HiddensortMW 1.23+ (Template:Git)
`wgCookiePrefix`	String	Prefix added to cookie names by default; used automatically by mw.cookie.	Template:HiddensortMW 1.18+ (Cite error: Invalid `<ref>` tag; name cannot be a simple integer. Use a descriptive title)
`wgCookieDomain`	String	Default domain for cookies; used automatically by mw.cookie.	Template:HiddensortMW 1.24+ (gerrit:120806)
`wgCookieExpiration`	Number	Default lifetime of cookies, in seconds (or 0 for session cookies); used automatically by mw.cookie.	Template:HiddensortMW 1.24+ (gerrit:120806)
`wgCookiePath`	String	Default path for cookies; used automatically by mw.cookie.	Template:HiddensortMW 1.24+ (gerrit:120806)
`wgDBname`	String	The name of the wiki's database.	Template:HiddensortMW 1.13+
`wgEnableAPI`	Boolean	`true` if the Mediawiki API is enabled at all; `false` otherwise.	Template:HiddensortMW 1.12+
`wgEnableWriteAPI`	Boolean	`true` if the Mediawiki write API is enabled at all; `false` otherwise. If `wgEnableAPI && !wgEnableWriteAPI`, only the read operations of the API are enabled.	Template:HiddensortMW 1.12+
`wgExtensionAssetsPath`	String	Root path used for extension static assets (e.g. images). Append '/' then the name of the extension to get the root path for a given extension.	Template:HiddensortMW 1.18+ (Cite error: Invalid `<ref>` tag; name cannot be a simple integer. Use a descriptive title)
`wgFileExtensions`	Array of strings	The list of all allowed file extensions (without period).	Template:HiddensortMW 1.16+
`wgFormattedNamespaces`	Object	Gives a mapping from namespace IDs to localized namespace names. For each namespace, the object has one entry that has the stringified namespace number as the key and the namespace name as its value. Aliases or canonical names are not included.	Template:HiddensortMW 1.16+
`wgLegacyJavaScriptGlobals`	Boolean		Template:HiddensortMW 1.18+ (Cite error: Invalid `<ref>` tag; name cannot be a simple integer. Use a descriptive title)
`wgLoadScript`	String		Template:HiddensortMW 1.17+
`wgMainPageTitle`	String	The page name of the wiki's main page, including the namespace name, if any. May contain blanks.	Template:HiddensortMW 1.16+
`wgNamespaceIds`	Object	Gives a mapping from namespace names to namespace IDs. For each namespace name, including aliases, the object has one entry that has namespace name as the key and the namespace ID as its integer value. Canonical names are not included. The keys are all lowercase, with blanks replaced by underscores.	Template:HiddensortMW 1.16+
`wgResourceLoaderMaxQueryLength`	Number		Template:HiddensortMW 1.18+ (Cite error: Invalid `<ref>` tag; name cannot be a simple integer. Use a descriptive title)
`wgScript`	String	Full path to the main access point script, starting at the root, including the full script name with extension. On WMF wikis, normally "/w/index.php". See also $wgScript.	Template:HiddensortMW 1.11+
`wgScriptExtension`	String	The file extension to use for all calls to script access points. Normally ".php". See also $wgScriptExtension.	Template:HiddensortMW 1.16+
`wgScriptPath`	String	The path part of `wgScript`, without trailing "/". This is the path to use for direct calls to the php access points such as `index.php` or `api.php`. See also $wgScriptPath.	Template:HiddensortMW 1.8+
`wgServer`	String	The server URL, not terminated by "/". The combination `wgServer + wgScriptPath + "/api.php"`, for instance, results in a valid URL to the API access point script.	Template:HiddensortMW 1.8+
`wgSiteName`	String	The name of the site, as defined by $wgSitename.	Template:HiddensortMW 1.16+
`wgUrlProtocols`	String	Stringified regular expression matching all protocols recognized in links, i.e. "http\\:\\/\\/\|https\\:\\/\\/\|..."	Template:HiddensortMW 1.16+
`wgVariantArticlePath`	String or `false`	If a wiki has language variants (such as the Chinese and the Serbian Wikipedias), set to a path beginning at the root for language variants other than `wgContentLanguage`. The path contains two placeholders: "$1" is to be replaced by the page title, and "$2" is to be replaced by the language code of the language variant (e.g. "zh-tw"). If the wiki does not have language variants, set to `false`. See also $wgVariantArticlePath.	Template:HiddensortMW 1.13+
`wgVersion`	String	Identifies the version of MediaWiki that served the page.	Template:HiddensortMW 1.12+

Some additional site-wide variables are present only depending on the wiki configuration.

Name	Type	Description	Availability
If Template:Wg and Template:Wg are true:
`wgMWSuggestTemplate` Template:Deprecated-inline	String	A URL that can be used to obtain search suggestions. The string contains two placeholders that should be replaced: `{searchTerms}` is to be replaced by the (urlencoded) search terms, and `{namespaces}` should be replaced by the namespace numbers of the namespaces to search, separated by a vertical bar ("\|").	MW 1.13 - MW 1.19 (Template:Git)
If the Ajax watch feature is enabled, the following variable is available:
`wgAjaxWatch` Template:Deprecated-inline	Object	An object containing various user interface messages, localized to `wgUserLanguage`.	MW 1.11 - MW 1.17 (Cite error: Invalid `<ref>` tag; name cannot be a simple integer. Use a descriptive title)

Page-specific

Name	Type	Description	Availability
`wgAction`	String	The action performed, e.g. "edit" for edit pages, or "view" for page views. See Manual:Parameters to index.php#Actions.	MW 1.10+
`wgArticleId`	Integer	The internal ID of the page. For non-existent pages and special pages, it is zero.	MW 1.8+
`wgBreakFrames`	Boolean	See $wgBreakFrames.	MW 1.9+
`wgCanonicalNamespace`	String	The canonical (i.e., not localized or aliased) namespace name of the page.	MW 1.8+
`wgCanonicalSpecialPageName`	String or `false` or not defined	On special pages, the canonical (i.e., not localized or aliased) name of the special page; otherwise it is not defined at all (up to and including MW 1.15) or is set to `false` (since MW 1.16).	MW 1.9+
`wgCategories`	Array of strings	The list of all the categories a page belongs to. This is essentially a JavaScript version of the category box shown on the page (grey box at bottom of page, in Monobook/Vector). If the category box is not shown on the current page (as is the case when editing/viewing history), `wgCategories` will be an empty array.	MW 1.16+
`wgCurRevisionId`	Integer	The top revision ID of the currently viewed page at the time the page was served. Also set on diff and history pages; zero for special pages.	MW 1.9+
`wgDefaultDateFormat`	String	E.g. "dmy". Depends on the page content language since 1.20 (gerrit:14271).	MW 1.18+ (Cite error: Invalid `<ref>` tag; name cannot be a simple integer. Use a descriptive title)
`wgDigitTransformTable`	Array of two strings	Describes digit transformations. If transformations are specified, the first entry contains a string of all Arabic digits ("0123456789"), the second array element gives in the corresponding string positions the replacement according to `wgPageContentLanguage`. The individual characters in each string are tab-separated. If no transformation is specified for the language, the value of `wgDigitTransformTable` is `["", ""]` (i.e., an array of two empty strings).	MW 1.12+
`wgIsArticle`	Boolean	`true` if the content displayed on the page is related to the source of the corresponding article on the wiki. So it is `true` when viewing a page (regardless of namespace), and also true when viewing a diff that has a rendered revision appended to the bottom of it. It is `false` for anything else (edit, history, special pages, most generated pages, etc). Note: This variable is badly named – it has nothing really to do with a page being an "article" or not.	MW 1.8+
`wgIsProbablyEditable`	boolean	True if the page is probably editable (based on quickUserCan) by the current user. The 'probably' is necessary for performance reasons. An exact editability check is too costly here, due to cascading protection and hook-based extensions like TitleBlacklist that may be enabled. If this is true, it is likely to be editable. If it is false, it is definitely not editable.	(Template:Git)
`wgMonthNames`	Array	Like January, February, ... Depends on the page content language since 1.20 (gerrit:14271).	MW 1.18+ (Cite error: Invalid `<ref>` tag; name cannot be a simple integer. Use a descriptive title)
`wgMonthNamesShort`	Array	Like Jan, Feb, ... Depends on the page content language since 1.20 (gerrit:14271).	MW 1.18+ (Cite error: Invalid `<ref>` tag; name cannot be a simple integer. Use a descriptive title)
`wgNamespaceNumber`	Integer	The number of the namespace the page is in.	MW 1.8+
`wgPageContentLanguage`	String	Language code of the page content language (according to `$context->getTitle()->getPageLanguage()`)	MW 1.19+ (Cite error: Invalid `<ref>` tag; name cannot be a simple integer. Use a descriptive title)
`wgPageContentModel`	String	`'wikitext'` on typical wiki pages, `'javascript'` on pages interpreted as JavaScript, `'css'` on pages interpreted as CSS.	Template:HiddensortMW 1.22+ (gerrit:62178)
`wgPageName`	String	The full name of the page, including the localized namespace name, if the namespace has a name (the main namespace (number 0) doesn't), and with blanks replaced by underscores.	MW 1.8+
`wgPostEdit`	Boolean	True if the user just saved this page. Add a dependency on the `mediawiki.action.view.postEdit` module as the variable is set dynamically from JavaScript. If the user did not just save a page the value is omitted entirely (e.g. not set to false but absent in in `mw.config`).	MW 1.21+ (gerrit:50480)
`wgRedirectedFrom`	String	When redirected contains the title of the page we were redirected from. If the page was not redirected, the value is omitted entirely (absent in `mw.config`). Uses the same format as `wgPageName`	MW 1.19+ (Cite error: Invalid `<ref>` tag; name cannot be a simple integer. Use a descriptive title)
`wgRelevantPageName`	String	The full name of the page to which content actions and navigation links (e.g. a skin's tabs) apply. The AJAX watch function uses this to work correctly on special pages such as Special:MovePage and Special:WhatLinksHere.	MW 1.19+ (Cite error: Invalid `<ref>` tag; name cannot be a simple integer. Use a descriptive title)
`wgRelevantUserName`	String or unset	The relevant name of the user to which content actions and some extra navigation links (e.g. link to user rights or user contributions) apply.	MW 1.23+ (Template:Git)
`wgRestrictionEdit`	Array of strings	If the page is editable at all (and is not a special page) and editing of the page is restricted to some user groups, the array contains the minimum user group a user must be in in order to edit the page. For semi-protected pages, it'd contain `["autoconfirmed"]`; for fully protected pages `["sysop"]`. If there are no explicit restrictions, the value is `[]` (an array with no elements). This array contains only explicit protections. Namespace-wide protections (e.g. MediaWiki namespace, $wgNamespaceProtection), cascading protections, or "protections" brought about by the TitleBlacklist extension's "noedit" attribute, are ignored by this array. On such pages, the value is normally `[]`, unless additional protections have been applied specifically to that page.	MW 1.14+
`wgRestrictionMove`	Array of strings	If the page is movable at all (and is not a special page) and moving of the page is restricted to some user groups, the array contains the minimum user group a user must be in in order to move the page. For semi-moveprotected pages, it'd contain `["autoconfirmed"]`; for fully moveprotected pages `["sysop"]`. If there are no explicit restrictions, the value is `[]` (an array with no elements). This array contains only explicit protections. Namespace-wide protections (e.g. MediaWiki namespace, $wgNamespaceProtection), cascading protections, or "protections" brought about by the TitleBlacklist extension's "moveonly" attribute, are ignored by this array. On such pages, the value is normally `[]`, unless additional protections have been applied specifically to that page.	MW 1.14+
`wgRevisionId`	Integer	The revision ID of the currently viewed revision, or the right revision for diff views. Also set on diff pages; zero for special pages, history pages, or anywhere else inapplicable.	MW 1.22+ Template:Git
`wgSeparatorTransformTable`	Array of two strings	Describes number separator transformations. The first entry contains a string of all canonical separators (single characters), the second array element gives in the corresponding string positions the replacement according to `wgPageContentLanguage`. The individual characters in each string are tab-separated. If no transformations are specified, the value of `wgSeparatorTransformTable` is `["", ""]` (i.e., an array of two empty strings).	MW 1.12+
`wgSearchType`	String or unset	The name of the search backend used to execute search requests.	MW 1.23+ (Template:Git)
`wgTitle`	String	The page title, without the namespace. May contain spaces – does not contain underscores.	MW 1.8+
`wgEditMessage`	String	The name of the message used to for the title of EditPage. Used by Live preview to update document.title and #firstHeading with a new displaytitle.	MW 1.25+ (Template:Git)

Some additional variables are present only depending on the page namespace, wiki configuration and/or user preferences.

Name	Type	Description	Availability
Main Page
`wgIsMainPage`	Boolean	`true` if the current page is the main page of the wiki. Omitted entirely otherwise (defaulting to null in `mw.config`).	MW 1.18+
If the content language has variants:
`wgUserVariant`	String	If the wiki has language variants, the language code of the user's preferred variant. If the wiki does not have variants, the variable is not configured (does not exist), i.e.: Template:Inline-code Template:Inline-code.	MW 1.16+
If the Ajax search suggestions are enabled (both globally and in the user's preferences), the following variables are available:
`wgMWSuggestMessages` Template:Deprecated-inline	Array of strings	Some localized user interface texts that may be used by the search suggestion engine.	MW 1.13 - MW 1.16
`wgSearchNamespaces` Template:Deprecated-inline	Array of integers	An array of the namespace numbers of all namespaces to search by default, according to the user's preferences.	MW 1.13 - MW 1.19 (Template:Git)
If the live preview is enabled, some MediaWiki versions may provide the following variables. (Note: it appears that these variables have been pulled in MW 1.16).
`wgLivepreviewMessageError` Template:Deprecated-inline	String	The contents of MediaWiki:Livepreview-error for `wgUserLanguage`.	MW 1.10-1.15
`wgLivepreviewMessageFailed` Template:Deprecated-inline	String	The contents of MediaWiki:Livepreview-failed for `wgUserLanguage`.	MW 1.10-1.15
`wgLivepreviewMessageLoading` Template:Deprecated-inline	String	The contents of MediaWiki:Livepreview-loading for `wgUserLanguage`.	MW 1.10-1.15
`wgLivepreviewMessageReady` Template:Deprecated-inline	String	The contents of MediaWiki:Livepreview-ready for `wgUserLanguage`.	MW 1.10-1.15

User-specific

Related to the user currently viewing the page:

Name	Type	Description	Availability
`wgUserEditCount`	Number	The number of edits the current user made (null if not logged in).	Template:HiddensortMW 1.21+
`wgUserGroups`	Array of strings	An array containing all the (local) user groups the current user is a member of, or `null` for non-logged-in users. User groups are identified by the internal user group names, e.g. "sysop", "autoconfirmed", "bureaucrat", and so on. The default user group is named "*".	MW 1.10+
`wgUserId`	Number	The numeric ID of the current user (null if not logged in).	Template:HiddensortMW 1.21+
`wgUserLanguage`	String	The language code for the user's interface language, as set in Special→Preferences (which may be overridden by a `uselang=` parameter in the URL).	Template:HiddensortMW 1.8+
`wgUserName`	String	The user name of the user currently viewing the page, if it's a logged-in user. For non-logged-in users, it is `null` (not the user's IP address, unlike PHP `$wgUser->getName()` on the server).	MW 1.8+
`wgUserRegistration`	Number	The time and date on which the current user registered, represented as milliseconds since epoch. Null if not logged in.	Template:HiddensortMW 1.21+

Hooks for extensions

ResourceLoaderGetConfigVars: Since MediaWiki 1.17 extensions can add their own site-wide variables through this hook.
MakeGlobalVariablesScript: Since MediaWIki 1.14 extensions can add their own variables to the OutputPage. If the variable is not dependent on the page being viewed, use the ResourceLoaderGetConfigVars hook instead.