Extension hook registry

The Hooks mechanism in MediaWiki is a powerful tool for extension authors to modify the behavior of MediaWiki while minimizing, if not eliminating, the need to hack the codebase. A logical extension of this idea is to place hooks in extensions themselves, in order to allow other developers to further extend those extensions. This page provides a listing and documentation for hooks provided by extension authors.

To document an extension hook:

1. Create a page named after the hook under your extension, e.g. Extension:MyExtension/MyHook. Note: this naming convention allows defaults and category links in Template:Extension and Template:SeeCustomHook to work properly.
2. Add a row for your hook in the table below.

Extension hooks by parent extension

Parent extension	Version Extension	Revision	Hook	Description
Admin Links			AdminLinks	Allows for adding sections and links to the Special:AdminLinks page.
ArticleComments	0.4	r73901	ArticleCommentsSpamCheck	Called on comment submission for spam detection.
Backup			Backup	Hook event called when a page change is effected
CategoryHook	0.2		CategoryHook	Adds a hook allowing articles to be added to additional categories based on wikitext content.
CentralAuth		1.13	CentralAuthWikiList	Get the list of wikis in which CentralAuth is active
ContactPage			ContactForm	Can be used to manipulate most of the values related to the contact message: the sender, the receiver, the subject and the actual contact message text.
ContactPage		r60638	ContactFormBeforeMessage	Can be used to add new fields to Special:Contact. Two parameters, $contactForm (Object; instance of EmailContactForm class) and &$form (HTML used to generate the form).
ContactPage			ContactFromComplete	Takes the same parameters as ContactForm hook does.
DatabaseFetchObject	0.1		DatabaseFetchObject	Hook for checking permissions in any context where database page contents are retrieved.
Echo			BeforeCreateEchoEvent	Allows registration of custom Echo events
EmailDomainCheck	0.1		EmailDomainCheck	Only allows registrations from a specific email domain
GoogleNewsSitemap			GoogleNewsSitemap::Query	Modifies the query used by GoogleNewsSitemap (used for flagged revs support)
ImagePageEx			ImagePageEx	Hooks for trapping delete related changes in NS_IMAGE
LDAP Authentication	1.1c+		SetUsernameAttributeFromLDAP	Allows hook function to set the LDAP username from various attributes returned by a query.
MathSearch			MathSearchGenerateAnchorString	allows for customization of formula Ids that are not set explicitly by the user
MobileFrontend	3b5e3c07f39e		EnableMobileModules	Allow other extensions to add modules depending on the MobileFrontend mode
NewUserMessage	3.1		CreateNewUserMessage	Hook for modules that allows them to override the default new user message.
Nuke	1.27.0		NukeGetNewPages	Called after searching for pages to delete; can be used to add and remove pages.
Nuke	1.27.0		NukeDeletePage	Allows other extensions to handle the deletion of titles.
Page Forms			PageForms::AddRLModules	Allows for adding additional ResourceLoader modules to forms
Page Forms			PageForms::BeforeFreeTextSubst	Allows for modifying the free text field
Page Forms			PageForms::CreateFormField	Allows for modifying a form field
Page Forms			PageForms::CreateTemplateText	Called when generating a template via one of the helper pages
Page Forms			PageForms::EditFormPreloadText	Can be used to set or change the preload text, for new pages
Page Forms			PageForms::FormPrinterSetup	Called as part of the form setup
Page Forms			PageForms::HTMLBeforeForm	Can be used to insert additional HTML at the beginning of the form
Page Forms			PageForms::PrintRedirectForm	Can be used to modify the mini-form that redirects users to the real form
Page Forms			PageForms::RenderingEnd	Called at the end of the form display
Page Forms			PageForms::SetTargetName	Can be used to set the "target" page name, based on a passed-in page name
Page Forms			PageForms::TemplateFieldStart	Called before generating a field in an automatically-generated template page
Page Forms			PageForms::TemplateFieldEnd	Called after generating a field in an automatically-generated template page
Page Forms			PageForms::UserCanEditPage	Can be used to set whether a user can edit a page
Page Forms			PageForms::WritePageData	Can be used to process additional form-definition syntax outside of what PF handles
PagesOnDemand	0.1		PagesOnDemand	Hook for modules that create new pages from templates when links to nonexistent pages are followed
Renameuser		1.11	RenameUserAbort	Allow other extensions to abort a user rename
Renameuser		1.11	RenameUserComplete	After a successful user rename
Renameuser		1.13	RenameUserPreRename	Before renaming a user
Renameuser		r55189	RenameUserSQL	In the constructor of RenameuserSQL class, allows adding tables to the array of tables that Renameuser should update on rename
Renameuser		1.13	RenameUserWarning	Get warnings when renaming a user
Shibboleth Authentication			ShibUpdateUser	Hook event called before user information gets updated on login (for setting the name/mail from Shibboleth)
SphinxSearch	0.7.2	r73342	SphinxSearchBeforeResults	Control various search parameters before search client is instantiated
SphinxSearch	0.7.2	r73342	SphinxSearchBeforeQuery	Control search term and sphinx client before search is executed
UserMerge	1.6.21	1.19 r89147	DeleteAccount	Trigger update actions elsewhere (e.g. in OpenID) when UserMerge has deleted an account
UserMerge	1.6.21	1.19 r89147	MergeAccountFromTo	Trigger update actions elsewhere (e.g. in OpenID) when UserMerge has merged one account to another