3 This document describes how event hooks work in MediaWiki; how to add
4 hooks for an event; and how to run hooks for an event.
9 Something that happens with the wiki. For example: a user logs
10 in. A wiki page is saved. A wiki page is deleted. Often there are
11 two events associated with a single action: one before the code
12 is run to make the event happen, and one after. Each event has a
13 name, preferably in CamelCase. For example, 'UserLogin',
14 'ArticleSave', 'ArticleSaveComplete', 'ArticleDelete'.
17 A clump of code and data that should be run when an event
18 happens. This can be either a function and a chunk of data, or an
22 The function part of a hook.
26 Hooks allow us to decouple optionally-run code from code that is run
27 for everyone. It allows MediaWiki hackers, third-party developers and
28 local administrators to define code that will be run at certain points
29 in the mainline code, and to modify the data run by that mainline
30 code. Hooks can keep mainline code simple, and make it easier to
31 write extensions. Hooks are a principled alternative to local patches.
33 Consider, for example, two options in MediaWiki. One reverses the
34 order of a title before displaying the article; the other converts the
35 title to all uppercase letters. Currently, in MediaWiki code, we
36 would handle this as follows (note: not real code, here):
38 function showAnArticle($article) {
39 global $wgReverseTitle, $wgCapitalizeTitle;
41 if ($wgReverseTitle) {
42 wfReverseTitle($article);
45 if ($wgCapitalizeTitle) {
46 wfCapitalizeTitle($article);
49 # code to actually show the article goes here
52 An extension writer, or a local admin, will often add custom code to
53 the function -- with or without a global variable. For example,
54 someone wanting email notification when an article is shown may add:
56 function showAnArticle($article) {
57 global $wgReverseTitle, $wgCapitalizeTitle;
59 if ($wgReverseTitle) {
60 wfReverseTitle($article);
63 if ($wgCapitalizeTitle) {
64 wfCapitalizeTitle($article);
67 # code to actually show the article goes here
69 if ($wgNotifyArticle) {
70 wfNotifyArticleShow($article));
74 Using a hook-running strategy, we can avoid having all this
75 option-specific stuff in our mainline code. Using hooks, the function
78 function showAnArticle($article) {
80 if (wfRunHooks('ArticleShow', array(&$article))) {
82 # code to actually show the article goes here
84 wfRunHooks('ArticleShowComplete', array(&$article));
88 We've cleaned up the code here by removing clumps of weird,
89 infrequently used code and moving them off somewhere else. It's much
90 easier for someone working with this code to see what's _really_ going
91 on, and make changes or fix bugs.
93 In addition, we can take all the code that deals with the little-used
94 title-reversing options (say) and put it in one place. Instead of
95 having little title-reversing if-blocks spread all over the codebase
96 in showAnArticle, deleteAnArticle, exportArticle, etc., we can
97 concentrate it all in an extension file:
99 function reverseArticleTitle($article) {
103 function reverseForExport($article) {
107 The setup function for the extension just has to add its hook
108 functions to the appropriate events:
110 setupTitleReversingExtension() {
113 $wgHooks['ArticleShow'][] = 'reverseArticleTitle';
114 $wgHooks['ArticleDelete'][] = 'reverseArticleTitle';
115 $wgHooks['ArticleExport'][] = 'reverseForExport';
118 Having all this code related to the title-reversion option in one
119 place means that it's easier to read and understand; you don't have to
120 do a grep-find to see where the $wgReverseTitle variable is used, say.
122 If the code is well enough isolated, it can even be excluded when not
123 used -- making for some slight savings in memory and load-up
124 performance at runtime. Admins who want to have all the reversed
127 require_once('extensions/ReverseTitle.php');
129 ...to their LocalSettings.php file; those of us who don't want or need
130 it can just leave it out.
132 The extensions don't even have to be shipped with MediaWiki; they
133 could be provided by a third-party developer or written by the admin
138 A hook is a chunk of code run at some particular event. It consists of:
140 * a function with some optional accompanying data, or
141 * an object with a method and some optional accompanying data.
143 Hooks are registered by adding them to the global $wgHooks array for a
144 given event. All the following are valid ways to define hooks:
146 $wgHooks['EventName'][] = 'someFunction'; # function, no data
147 $wgHooks['EventName'][] = array('someFunction', $someData);
148 $wgHooks['EventName'][] = array('someFunction'); # weird, but OK
150 $wgHooks['EventName'][] = $object; # object only
151 $wgHooks['EventName'][] = array($object, 'someMethod');
152 $wgHooks['EventName'][] = array($object, 'someMethod', $someData);
153 $wgHooks['EventName'][] = array($object); # weird but OK
155 When an event occurs, the function (or object method) will be called
156 with the optional data provided as well as event-specific parameters.
157 The above examples would result in the following code being executed
158 when 'EventName' happened:
161 someFunction($param1, $param2)
163 someFunction($someData, $param1, $param2)
166 $object->onEventName($param1, $param2)
168 $object->someMethod($param1, $param2)
169 # object with method and data
170 $object->someMethod($someData, $param1, $param2)
172 Note that when an object is the hook, and there's no specified method,
173 the default method called is 'onEventName'. For different events this
174 would be different: 'onArticleSave', 'onUserLogin', etc.
176 The extra data is useful if we want to use the same function or object
177 for different purposes. For example:
179 $wgHooks['ArticleSaveComplete'][] = array('ircNotify', 'TimStarling');
180 $wgHooks['ArticleSaveComplete'][] = array('ircNotify', 'brion');
182 This code would result in ircNotify being run twice when an article is
183 saved: once for 'TimStarling', and once for 'brion'.
185 Hooks can return three possible values:
187 * true: the hook has operated successfully
188 * "some string": an error occurred; processing should
189 stop and the error should be shown to the user
190 * false: the hook has successfully done the work
191 necessary and the calling function should skip
193 The last result would be for cases where the hook function replaces
194 the main functionality. For example, if you wanted to authenticate
195 users to a custom system (LDAP, another PHP program, whatever), you
198 $wgHooks['UserLogin'][] = array('ldapLogin', $ldapServer);
200 function ldapLogin($username, $password) {
205 Returning false makes less sense for events where the action is
206 complete, and will normally be ignored.
210 A calling function or method uses the wfRunHooks() function to run
211 the hooks related to a particular event, like so:
217 if (wfRunHooks('ArticleProtect', array(&$this, &$wgUser))) {
218 # protect the article
219 wfRunHooks('ArticleProtectComplete', array(&$this, &$wgUser));
224 wfRunHooks() returns true if the calling function should continue
225 processing (the hooks ran OK, or there are no hooks to run), or false
226 if it shouldn't (an error occurred, or one of the hooks handled the
227 action already). Checking the return value matters more for "before"
228 hooks than for "complete" hooks.
230 Note that hook parameters are passed in an array; this is a necessary
231 inconvenience to make it possible to pass reference values (that can
232 be changed) into the hook code. Also note that earlier versions of
233 wfRunHooks took a variable number of arguments; the array() calling
234 protocol came about after MediaWiki 1.4rc1.
236 ==Events and parameters==
238 This is a list of known events and parameters; please add to it if
239 you're going to add events to the MediaWiki code.
241 'AbortLogin': Return false to cancel account login.
242 $user: the User object being authenticated against
243 $password: the password being submitted, not yet checked for validity
244 &$retval: a LoginForm class constant to return from authenticateUserData();
245 default is LoginForm::ABORTED. Note that the client may be using
246 a machine API rather than the HTML user interface.
248 'AbortNewAccount': Return false to cancel account creation.
249 $user: the User object about to be created (read-only, incomplete)
250 $message: out parameter: error message to display on abort
252 'AddNewAccount': after a user account is created
253 $user: the User object that was created. (Parameter added in 1.7)
255 'AlternateEdit': before checking if an user can edit a page and
256 before showing the edit form ( EditPage::edit() ). This is triggered
258 $EditPage : the EditPage object
260 'ArticleDelete': before an article is deleted
261 $article: the article (object) being deleted
262 $user: the user (object) deleting the article
263 $reason: the reason (string) the article is being deleted
265 'ArticleDeleteComplete': after an article is deleted
266 $article: the article that was deleted
267 $user: the user that deleted the article
268 $reason: the reason the article was deleted
270 'ArticleInsertComplete': After an article is created
271 $article: Article created
272 $user: User creating the article
274 $summary: Edit summary/comment
275 $isMinor: Whether or not the edit was marked as minor
276 $isWatch: (No longer used)
277 $section: (No longer used)
278 $flags: Flags passed to Article::doEdit()
279 $revision: New Revision of the article
281 'ArticleProtect': before an article is protected
282 $article: the article being protected
283 $user: the user doing the protection
284 $protect: boolean whether this is a protect or an unprotect
285 $reason: Reason for protect
286 $moveonly: boolean whether this is for move only or not
288 'ArticleProtectComplete': after an article is protected
289 $article: the article that was protected
290 $user: the user who did the protection
291 $protect: boolean whether it was a protect or an unprotect
292 $reason: Reason for protect
293 $moveonly: boolean whether it was for move only or not
295 'ArticleSave': before an article is saved
296 $article: the article (object) being saved
297 $user: the user (object) saving the article
298 $text: the new article text
299 $summary: the article summary (comment)
304 'ArticleSaveComplete': After an article has been updated
305 $article: Article modified
306 $user: User performing the modification
308 $summary: Edit summary/comment
309 $isMinor: Whether or not the edit was marked as minor
310 $isWatch: (No longer used)
311 $section: (No longer used)
312 $flags: Flags passed to Article::doEdit()
313 $revision: New Revision of the article
315 'ArticleSaveComplete': after an article is saved
316 $article: the article (object) saved
317 $user: the user (object) who saved the article
318 $text: the new article text
319 $summary: the article summary (comment)
324 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$wgUser, $text, $summary, $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
326 'ArticleUndeleted': When one or more revisions of an article are restored
327 $title: Title corresponding to the article restored
328 $create: Whether or not the restoration caused the page to be created
329 (i.e. it didn't exist before)
331 'ArticleViewHeader': Before the parser cache is about to be tried for article viewing.
332 &$pcache: whether to try the parser cache or not
333 &$outputDone: whether the output for this page finished or not
335 'ArticleUpdateBeforeRedirect': After a page is updated (usually on save), before the user is redirected back to the page
336 &$article: the article
337 &$sectionanchor: The section anchor link (e.g. "#overview" )
338 &$extraq: Extra query parameters which can be added via hooked functions
340 'AuthPluginSetup': update or replace authentication plugin object ($wgAuth)
341 Gives a chance for an extension to set it programattically to a variable class.
342 &$auth: the $wgAuth object, probably a stub
344 'AutoAuthenticate': called to authenticate users on external/environmental means
345 $user: writes user object to this parameter
347 'BadImage': When checking against the bad image list
348 $name: Image name being checked
349 &$bad: Whether or not the image is "bad"
351 Change $bad and return false to override. If an image is "bad", it is not
352 rendered inline in wiki pages or galleries in category pages.
354 'BeforeGalleryFindFile': before an image is fetched for a gallery
355 &$gallery,: the gallery object
356 &$nt: the image title
357 &$time: image timestamp
359 'BeforeParserFetchTemplateAndtitle': before a template is fetched by Parser
360 &$parser: Parser object
361 &$title: title of the template
362 &$skip: skip this template and link it?
363 &$id: the id of the revision being parsed
365 'BeforeParserMakeImageLinkObj': before an image is rendered by Parser
366 &$parser: Parser object
367 &$nt: the image title
368 &$skip: skip this image and link it?
369 &$time: the image timestamp
371 'BeforeParserrenderImageGallery': before an image gallery is rendered by Parser
372 &$parser: Parser object
373 &$ig: ImageGallery object
375 'BlockIp': before an IP address or user is blocked
376 $block: the Block object about to be saved
377 $user: the user _doing_ the block (not the one being blocked)
379 'BlockIpComplete': after an IP address or user is blocked
380 $block: the Block object that was saved
381 $user: the user who did the block (not the one being blocked)
383 'BookInformation': Before information output on Special:Booksources
384 $isbn: ISBN to show information for
385 $output: OutputPage object in use
387 'ContributionsToolLinks': Change tool links above Special:Contributions
389 $title: User page title
390 &$tools: Array of tool links
392 'CustomEditor': When invoking the page editor
393 $article: Article being edited
394 $user: User performing the edit
396 Return true to allow the normal editor to be used, or false
397 if implementing a custom editor, e.g. for a special namespace,
400 'DiffViewHeader': called before diff display
401 $diff: DifferenceEngine object that's calling
402 $oldRev: Revision object of the "old" revision (may be null/invalid)
403 $newRev: Revision object of the "new" revision
405 'EditPage::attemptSave': called before an article is
406 saved, that is before insertNewArticle() is called
407 &$editpage_Obj: the current EditPage object
409 'EditFormPreloadText': Allows population of the edit form when creating new pages
410 &$text: Text to preload with
411 &$title: Title object representing the page being created
413 'EditPage::showEditForm:fields': allows injection of form field into edit form
414 &$editor: the EditPage instance for reference
415 &$out: an OutputPage instance to write to
416 return value is ignored (should always return true)
418 'EditFilter': Perform checks on an edit
419 $editor: Edit form (see includes/EditPage.php)
420 $text: Contents of the edit box
421 $section: Section being edited
422 &$error: Error message to return
424 Return false to halt editing; you'll need to handle error messages, etc. yourself.
425 Alternatively, modifying $error and returning true will cause the contents of $error
426 to be echoed at the top of the edit form as wikitext. Return true without altering
427 $error to allow the edit to proceed.
429 'EditSectionLink': Override the return value of Linker::editSectionLink()
430 $skin: Skin rendering the UI
431 $title: Title being linked to
432 $section: Section to link to
434 $result: Result (alter this to override the generated links)
436 'EditSectionLinkForOther': Override the return value of Linker::editSectionLinkForOther()
437 $skin: Skin rendering the UI
438 $title: Title being linked to
439 $section: Section to link to
440 $hint: Anchor title/tooltip attributes
442 $result: Result (alter this to override the generated links)
444 'EmailConfirmed': When checking that the user's email address is "confirmed"
445 $user: User being checked
446 $confirmed: Whether or not the email address is confirmed
447 This runs before the other checks, such as anonymity and the real check; return
448 true to allow those checks to occur, and false if checking is done.
450 'EmailUser': before sending email from one user to another
451 $to: address of receiving user
452 $from: address of sending user
453 $subject: subject of the mail
454 $text: text of the mail
456 'EmailUserComplete': after sending email from one user to another
457 $to: address of receiving user
458 $from: address of sending user
459 $subject: subject of the mail
460 $text: text of the mail
462 'FetchChangesList': When fetching the ChangesList derivative for a particular user
463 &$user: User the list is being fetched for
464 &$skin: Skin object to be used with the list
465 &$list: List object (defaults to NULL, change it to an object instance and return
466 false override the list derivative used)
468 'FileUpload': When a file upload occurs
469 $file : Image object representing the file that was uploaded
471 'GetInternalURL': modify fully-qualified URLs used for squid cache purging
472 $title: Title object of page
473 $url: string value as output (out parameter, can modify)
474 $query: query options passed to Title::getInternalURL()
476 'GetLocalURL': modify local URLs as output into page links
477 $title: Title object of page
478 $url: string value as output (out parameter, can modify)
479 $query: query options passed to Title::getLocalURL()
481 'GetFullURL': modify fully-qualified URLs used in redirects/export/offsite data
482 $title: Title object of page
483 $url: string value as output (out parameter, can modify)
484 $query: query options passed to Title::getFullURL()
486 'ImageOpenShowImageInlineBefore': Call potential extension just before showing the image on an image page
487 $imagePage: ImagePage object ($this)
490 'InitPreferencesForm': called at the end of PreferencesForm's constructor
491 $form: the PreferencesForm
492 $request: the web request to initialized from
494 'InternalParseBeforeLinks': during Parser's internalParse method before links but
495 after noinclude/includeonly/onlyinclude and other processing.
496 &$this: Parser object
497 &$text: string containing partially parsed text
498 &$this->mStripState: Parser's internal StripState object
500 'isValidPassword': Override the result of User::isValidPassword()
501 $password: Desired password
502 &$result: Set this and return false to override the internal checks
503 $user: User the password is being validated for
505 'LinksUpdateConstructed': At the end of LinksUpdate() is contruction.
506 &$linksUpdate: the LinkUpdate object
508 'LoginAuthenticateAudit': a login attempt for a valid user account either succeeded or failed.
509 No return data is accepted; this hook is for auditing only.
510 $user: the User object being authenticated against
511 $password: the password being submitted and found wanting
512 $retval: a LoginForm class constant with authenticateUserData() return value (SUCCESS, WRONG_PASS, etc)
514 'LogPageValidTypes': action being logged. DEPRECATED: Use $wgLogTypes
515 &$type: array of strings
517 'LogPageLogName': name of the logging page(s). DEPRECATED: Use $wgLogNames
518 &$typeText: array of strings
520 'LogPageLogHeader': strings used by wfMsg as a header. DEPRECATED: Use $wgLogHeaders
521 &$headerText: array of strings
523 'LogPageActionText': strings used by wfMsg as a header. DEPRECATED: Use $wgLogActions
524 &$actionText: array of strings
526 'MarkPatrolled': before an edit is marked patrolled
527 $rcid: ID of the revision to be marked patrolled
528 $user: the user (object) marking the revision as patrolled
529 $wcOnlySysopsCanPatrol: config setting indicating whether the user
530 needs to be a sysop in order to mark an edit patrolled
532 'MarkPatrolledComplete': after an edit is marked patrolled
533 $rcid: ID of the revision marked as patrolled
534 $user: user (object) who marked the edit patrolled
535 $wcOnlySysopsCanPatrol: config setting indicating whether the user
536 must be a sysop to patrol the edit
538 'MathAfterTexvc': after texvc is executed when rendering mathematics
539 $mathRenderer: instance of MathRenderer
540 $errmsg: error message, in HTML (string). Nonempty indicates failure
541 of rendering the formula
543 'OutputPageBeforeHTML': a page has been processed by the parser and
544 the resulting HTML is about to be displayed.
545 $parserOutput: the parserOutput (object) that corresponds to the page
546 $text: the text that will be displayed, in HTML (string)
548 'PageHistoryBeforeList': When a history page list is about to be constructed.
549 $article: the article that the history is loading for
551 'PageHistoryLineEnding' : right before the end <li> is added to a history line
552 $row: the revision row for this line
553 $s: the string representing this parsed line
555 'PageRenderingHash': alter the parser cache option hash key
556 A parser extension which depends on user options should install
557 this hook and append its values to the key.
558 $hash: reference to a hash key string which can be modified
560 'ParserTestTables': alter the list of tables to duplicate when parser tests
561 are run. Use when page save hooks require the presence of custom tables
562 to ensure that tests continue to run properly.
563 &$tables: array of table names
565 'PersonalUrls': Alter the user-specific navigation links (e.g. "my page,
566 my talk page, my contributions" etc).
568 &$personal_urls: Array of link specifiers (see SkinTemplate.php)
569 &$title: Title object representing the current page
571 'PingLimiter': Allows extensions to override the results of User::pingLimiter()
572 &$user : User performing the action
573 $action : Action being performed
574 &$result : Whether or not the action should be prevented
575 Change $result and return false to give a definitive answer, otherwise
576 the built-in rate limiting checks are used, if enabled.
578 'PreferencesUserInformationPanel': Add HTML bits to user information list in preferences form
579 $form : PreferencesForm object
580 &$html : HTML to append to
582 'RawPageViewBeforeOutput': Right before the text is blown out in action=raw
583 &$obj: RawPage object
584 &$text: The text that's going to be the output
586 'RenderPreferencesForm': called at the end of PreferencesForm::mainPrefsForm
587 $form: the PreferencesForm
588 $out: output page to render to, probably $wgOut
590 'ResetPreferences': called at the end of PreferencesForm::resetPrefs
591 $form: the PreferencesForm
592 $user: the User object to load preferences from
594 'SavePreferences': called at the end of PreferencesForm::savePreferences;
595 returning false prevents the preferences from being saved.
596 $form: the PreferencesForm
597 $user: the User object to save preferences to
598 $message: change this to set an error message (ignored if the hook does notreturn fals)
600 'SearchUpdate': Prior to search update completion
602 $namespace : Page namespace
604 $text : Current text being indexed
606 'SiteNoticeBefore': Before the sitenotice/anonnotice is composed
607 &$siteNotice: HTML returned as the sitenotice
608 Return true to allow the normal method of notice selection/rendering to work,
609 or change the value of $siteNotice and return false to alter it.
611 'SiteNoticeAfter': After the sitenotice/anonnotice is composed
612 &$siteNotice: HTML sitenotice
613 Alter the contents of $siteNotice to add to/alter the sitenotice/anonnotice.
615 'SkinAfterBottomScripts': At the end of Skin::bottomScripts()
617 &$text: bottomScripts Text
618 Append to $text to add additional text/scripts after the stock bottom scripts.
620 'SkinTemplateOutputPageBeforeExec': Before SkinTemplate::outputPage() starts page output
621 &$sktemplate: SkinTemplate object
622 &$tpl: Template engine object
624 'SpecialContributionsBeforeMainOutput': Before the form on Special:Contributions
627 'TitleMoveComplete': after moving an article (title)
630 $user: user who did the move
631 $pageid: database ID of the page that's been moved
632 $redirid: database ID of the created redirect
634 'UnknownAction': An unknown "action" has occured (useful for defining
637 $article: article "acted on"
639 'UnwatchArticle': before a watch is removed from an article
641 $article: article object to be removed
643 'UnwatchArticle': after a watch is removed from an article
644 $user: user that was watching
645 $article: article object removed
647 'UploadForm:initial': before the upload form is generated
648 $form: UploadForm object
649 You might set the member-variables $uploadFormTextTop and
650 $uploadFormTextAfterSummary to inject text (HTML) either before
651 or after the editform.
653 'UploadForm:BeforeProcessing': at the beginning of processUpload()
654 $form: UploadForm object
655 Lets you poke at member variables like $mUploadDescription before the
658 'UploadVerification': additional chances to reject an uploaded file
659 string $saveName: destination file name
660 string $tempName: filesystem path to the temporary file for checks
661 string &$error: output: HTML error to show if upload canceled by returning false
663 'UploadComplete': Upon completion of a file upload
664 $image: Image object representing the file that was uploaded
666 'UserCan': To interrupt/advise the "user can do X to Y article" check
667 $title: Title object being checked against
668 $user : Current user object
669 $action: Action being checked
670 $result: Pointer to result returned if hook returns false. If null is returned,
671 UserCan checks are continued by internal code
673 'UserCreateForm': change to manipulate the login form
674 $template: SimpleTemplate instance for the form
676 'UserLoginComplete': after a user has logged in
677 $user: the user object that was created on login
679 'UserLoginForm': change to manipulate the login form
680 $template: SimpleTemplate instance for the form
682 'UserLogout': before a user logs out
683 $user: the user object that is about to be logged out
685 'UserLogoutComplete': after a user has logged out
686 $user: the user object _after_ logout (won't have name, ID, etc.)
688 'UserRights': After a user's group memberships are changed
689 $user : User object that was changed
690 $add : Array of strings corresponding to groups added
691 $remove: Array of strings corresponding to groups removed
693 'WatchArticle': before a watch is added to an article
694 $user: user that will watch
695 $article: article object to be watched
697 'WatchArticleComplete': after a watch is added to an article
698 $user: user that watched
699 $article: article object watched
701 'UnwatchArticleComplete': after a watch is removed from an article
702 $user: user that watched
703 $article: article object that was watched
705 'UserGetImplicitGroups': Called in User::getImplicitGroups()
706 &$groups: List of implicit (automatically-assigned) groups
708 'UserGetRights': Called in User::getRights()
709 $user: User to get rights for
710 &$rights: Current rights
712 'UserEffectiveGroups': Called in User::getEffectiveGroups()
713 $user: User to get groups for
714 &$groups: Current effective groups
716 'CategoryPageView': before viewing a categorypage in CategoryPage::view
717 $catpage: CategoryPage instance
719 'SkinTemplateContentActions': after building the $content_action array right
720 before returning it, see Content_action.php in
721 the extensions/examples/ directory
722 ( http://svn.wikimedia.org/viewvc/mediawiki/trunk/extensions/examples/ )
723 for a demonstration of how to use this hook.
724 $content_actions: The array of content actions
726 'BeforePageDisplay': Called just before outputting a page (all kinds of,
727 articles, special, history, preview, diff, edit, ...)
728 Can be used to set custom CSS/JS
729 $out: OutputPage object
731 'ShowRawCssJs': Customise the output of raw CSS and JavaScript in page views
732 $text: Text being shown
733 $title: Title of the custom script/stylesheet page
734 $output: Current OutputPage object
736 'AjaxAddScript': Called in output page just before the initialisation
737 of the javascript ajax engine. The hook is only called when ajax
738 is enabled ( $wgUseAjax = true; ).
740 More hooks might be available but undocumented, you can execute
741 ./maintenance/findhooks.php to find hidden one.