Extension:BreadCrumbs2

MediaWiki.org > Extensions > User interface > Extension:BreadCrumbs2

MediaWiki extensions manual

BreadCrumbs2 Release status: stable
Implementation	User interface, Skin
Description	Provides breadcrumb navigation based on categories
Author(s)	Eric Hartwell, Ike Hecht
Maintainer(s)	YOUR1
Latest version	2.1.1 (2020-05-26)
MediaWiki	1.29 - 1.39
PHP	5.5+
License	Creative Commons Attribution 3.0
Download	Download extension Git [?]: Download Git master browse repository (Phabricator · GitHub) commit history repository contributors (GitHub) code review
Example	MediaWiki.org > Extensions > User interface > BreadCrumbs2
Parameters $wgBreadCrumbs2RemoveBasePageLink $wgBreadCrumbs2HideUnmatched
Hooks used SidebarBeforeOutput SkinSubPageSubtitle
Quarterly downloads	52 (Ranked 83rd)
Translate the BreadCrumbs2 extension if it is available at translatewiki.net

The BreadCrumbs2 extension generates "breadcrumbs" to help users navigate around your wiki (assuming it has a structure suitable for navigation). Breadcrumbs inserts a single line navigation string before a page's content. A sample breadcrumb for this page is shown in pale yellow above.

This extension creates breadcrumbs in the category-based "Where am I?" sense; use Extension:JSBreadCrumbs for breadcrumbs in the traditional "How did I get here?" sense.

For each page the extension can use the categories and/or namespace to:

1. Insert a single line navigation string before a page's content
2. Highlight the active sidebar link and/or tab
3. Change the site logo

Breadcrumbs use a single line of text to show a page's location in the site hierarchy... Breadcrumbs have always been a secondary navigation aid... All that breadcrumbs do is make it easier for users to move around the site, assuming its content and overall structure make sense.

BreadCrumbs2 is especially useful with skins like GuMax that display the navigation bar as a row of tabs at the top of the page instead of the Discussion/Edit/History tools.

Usage

The breadcrumb data is stored in a page in the MediaWiki namespace, MediaWiki:Breadcrumbs. To access the page, either enter "MediaWiki:Breadcrumbs" into the search box on your wiki and click the search icon, or copy and paste the link [[MediaWiki:Breadcrumbs]] into a page, then open and edit. The contents are formatted as a wikitext list, with one line per breadcrumb option:

* category name @ breadcrumb wikitext @ tab name @ site logo 

Extra blanks between parameters are ignored.

Avoid adding unnecessary blank lines between entries in the breadcrumb list.

Parameter	Type	Description
category name	Required	For each line in the list, see if the current page is a member of the category that matches category or the namespace with the same name.
breadcrumb wikitext	Optional	Text to display in the subtitle with the page name appended
tab name	Optional	The tab (navigation) bar with the name tab name that matches category is marked as active.
site logo	Optional	Use a different site logo for this page. (Note: Use this option with care)

Navigation

The extension inserts a single line navigation string before a page's contents.

Jakob Nielsen strongly encourages web designers to use the '>' character to delimit breadcrumb levels.

For example,

* Hook extensions @ [[Main Page|MediaWiki.org]] > [[:Category:Extensions|Extensions]] >

Generates the following breadcrumb for this page:

MediaWiki.org > Extensions > BreadCrumbs2

Note that BreadCrumbs2 uses the first match with the current page's namespace or one of the page's categories. For example, if the Breadcrumbs page contains:

* Navigation extensions @ [[Main Page|MediaWiki.org]] > [[:Category:Extensions|Extensions]] > [[:Category:Navigation extensions|Navigation]] >
* User interface extensions @ [[Main Page|MediaWiki.org]] > [[:Category:Extensions|Extensions]] > [[:Category:User interface extensions|User interface]] >

The breadcrumbs for this page would be MediaWiki.org > Extensions > Navigation > BreadCrumbs2 and not MediaWiki.org > Extensions > User interface > BreadCrumbs2 because the Navigation line comes first.

Sidebar

The active link in the navigation sidebar can be highlighted using the tab name parameter, if specified. This is especially useful with skins like GuMax that display the navigation bar as a row of tabs at the top of the page instead of the Discussion/Edit/History tools.

Note

The tab name is compared to the actual text displayed in the sidebar, so it is not language-independent.

Site logo

If the site logo parameter is specified, an alternate image file is used instead of the site default. The path to this image is relative to the root of your wiki.

Note

Use this feature with caution so that it doesn't interfere with your site's usability. Subtle changes are good, but dramatic changes can be confusing. If your site needs significantly different look and feel between sections, consider using namespaces and namespace-specific styles and/or DynamicSkin.

Download

You can download the extension code, in .tar.gz format, via Special:ExtensionDistributor.

You can also download the code directly via Git from the MediaWiki source code repository. From a command line, you can call the following:

git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/BreadCrumbs2.git

To view the code online, including version history for each file, go here.

Installation

• Download and move the extracted BreadCrumbs2 folder to your extensions/ directory.
  Developers and code contributors should install the extension from Git instead, using:cd extensions/
git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/BreadCrumbs2
• Add the following code at the bottom of your LocalSettings.php file:

  wfLoadExtension( 'BreadCrumbs2' );
  

• Configure as required.
• Create a new page called "MediaWiki:Breadcrumbs"
•  Done – Navigate to Special:Version on your wiki to verify that the extension is successfully installed.

Configuration

$wgBreadCrumbs2RemoveBasePageLink

If breadcrumbs are defined for this page, remove the link back to the base page. Defaults to "false".

$wgBreadCrumbs2HideUnmatched

If no breadcrumbs are defined for this page, show nothing. Defaults to "false".

Tips, tricks, and hoops

• The breadcrumb list in MediaWiki:Breadcrumbs defines all the categories and subcategories used for navigation.
• The extension uses the '@' character to delimit parameters instead of '|' as used in MediaWiki:Sidebar. This greatly simplifies the use of conditional templates in the breadcrumb list.

• If some of your users don't like the breadcrumbs, they can hide it with some CSS (see Manual:$wgAllowUserCss):

#breadcrumbs2 {
   display: none;
}

Technical details

The breadcrumbs are built from the data page as follows:

1. The string '@@@' is stripped from the text to be replaced with '@' before output (since the '@' character is used as a delimiter)
2. Pseudo-variables of the form @@VAR@@ are evaluated.
   • @@USERID@@: User ID, blank if anonymous
   • @@USERGROUPS@@: Comma-delimited list of groups this user belongs to
3. Templates and variables in the text are expanded. You can use parser functions like #if: if installed.
4. The extension scans each line to find the first match with the current page's namespace or one of the page's categories.
5. The remainder of the line is evaluated to set the breadcrumb string, sidebar, and/or logo (see below)

See also

• Extension:JSBreadCrumbs adds a trail of breadcrumbs below the tab bar.
• Extension:GeoCrumbs implements Wikivoyage's breadcrumbs. Breadcrumb navigation shows bread crumb menus under the title of an article to show the countries and regions that a destination belongs to.