(r14) BreadCrumbsPlugin < Extensions

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---+!! <nop>BreadCrumbsPlugin
%TOC%
---++ Description
This plugin helps you to locate where you are, and shows you how
you can escape from there using breadcrumbs navigation.

Two types of breadcrumb are supported; "location" breadcrumbs, which show you
where you are in the site hierarchy, taking into account topic parent relationships, and "path" breadcrumbs, that simply show you where you have been, but without going in circles.

In a way, location breadcrumbs have always been supported using the
=META{"parent"}= variable to display the list of parent topics. Since version
the advent of hierarchical, subwebs breadcrumbs support of
the standard engine does not allow the display of parent webs as part of of the location
breadcrumbs.

Path breadcrumbs show you which topics you visited to reach the current topic. If you revisit a topic you visited earlier, the path is trimmed back to that topic, so it gives you a sort of visual history of where you have been on the site. Path breadcrumbs require that you have session support enabled.

The plugin also gives a great deal of flexibility in deciding which
parts of the breadcrumbs should be rendered, and how each
individual breadcrumb is displayed.

---++ Configuration
While most settings are given as part of the =BREADCRUMBS= tag, there are a few settings
to improve rendering breadcrumbs.

---+++ Enabling Path breadcrumbs
To switch on recording the path breadcrumbs, set the =BREADCRUMBSPLUGIN_RECORDTRAIL= to =on=.
Otherwise the click path of the user won't be recorded and the =type= setting to the
BREADCRUMBS will result in an undefined behaviour.

---+++ Displaying !TopicTitles
!TopicTitles are a concept introduced by the Foswiki:Extensions/DBCachePlugin. These are stored
in a topic in the =TOPICTITLE= preference variable or in a formfield
'TopicTitle ' of a forms attached to the topic. If a !TopicTitle is
defined for a topic, it will be displayed in the breadcrumbs instead of the
normal !WikiWord topic name. For efficiency it is recommended to install the
Foswiki:Extensions/DBCachePlugin to determine the !TopicTitle.

---++ Syntax
=%<nop>BREADCRUMBS%, %<nop>BREADCRUMBS{"&lt;web>.&lt;topic>" ...}%=

*Parameters*:
   * =&lt;web>.&lt;topic>=: the location to which breadcrumbs should be generated (type="location" only, ignored if type="path")
     defaults to the current topic
   * =type=: "location" (the default) or "path"
   * =header=: format string prepended to the output result
   * =format=: format string to render one item on the breadcrumbs path
     (defaults to '[<nop>[$webtopic][$name]]')
   * =topicformat=: format string for any _topic_ items on the path; for example, parent topics. Defaults to the same as =format=.
   * =footer=: format string appended to the output result
   * =separator=: format string to be put between items
     (defaults to one space char)
   * =include=: regular expression that items must match to be part of the path
   * =exclude=: regular expression that items must _not_ match to be part of the path
   * =recurse=:  (type="location" only) can be one or more of the following values (comma separated) to
     decide which parts of the breadcrumbs path should be included (defaults to 'on'):
      * =on=: include all parent webs and all parent topics
      * =off=: include only the current web and the current topic
      * =weboff=: don't recurse on webs, include only the current web
      * =topicoff=: don't recurse on topics
      * =webonce=: include the next parent web but not the parent web's parent web
      * =topiconce=: include the next parent topic but not the parent topic's parent topic
      * =once=: short formf of =webonce, topiconce=
   * =spaceout=: space out !WikiWords inserting a separator (defaults to 'off')
   * =spaceoutsep=: separator to be used when spacing out !WikiWords
   * =maxlength=: maximum length of a breadcrumbs before inserting an ellipsis in the middle,
     0 meaning disable this feature (defaults to 0)
   * =ellipsis=: character sequence to be inserted when reducing the maxlength of the breadcrumbs
     (defaults to ' ... ')

*Pseudo-variables*: %BR%
Each of the above format strings (format, header, footer,
separator) may contain special variables:
   * =$name=: the name of the breadcrumb, this is the topic name or the web name having its
     parent web part being stripped off (that is =Bar= instead of =Sandbox/Foo/Bar=)
   * =$webtopic=: the full =web.topic= of the breadcrumb (wiki syntax)
   * =$web=: the web part of the current breadcrumb
   * =$topic=: the topic part of the current breadcrumb
   * =$target=: the full =web/topic= of the breadcrumb (url syntax)
   * =$name=: name of the breadcrumbs item this is the !TopicTitle, spaced out or normal topic name
     topic
   * =$n=: replaced with a newline char (\n)
   * =$percnt=: replaced with a percent char (%)
   * =$dollar=: replaced with a dollar char ($)
   * =$nop=: removed from the format string before expanding common variables

---++ Examples
---+++ default
<verbatim>
%BREADCRUMBS%
</verbatim>
%BREADCRUMBS%

---+++ path
<verbatim>
%BREADCRUMBS{type="path"}%
</verbatim>
%BREADCRUMBS{type="path"}%

---+++ breadcrumbs to a non-existent location
<verbatim>
%BREADCRUMBS{
  "Web1/Web2/Web3.Topic"
  format="$name"
  separator=" &#187; "}%
</verbatim>
%BREADCRUMBS{"Web1/Web2/Web3.Topic" format="$name" separator=" &#187; "}%

----+++ recurse="off"
<verbatim>
%BREADCRUMBS{
  "Web1/Web2/Web3.Topic"
  format="$name"
  separator=" &#187; "
  recurse="off"}%
</verbatim>
%BREADCRUMBS{"Web1/Web2/Web3.Topic" format="$name" separator=" &#187; " recurse="off"}%

----+++ recurse="once"
<verbatim>
%BREADCRUMBS{"Web1/Web2/Web3.Topic"
  format="$name"
  separator=" &#187; "
  recurse="once"}%
</verbatim>
%BREADCRUMBS{"Web1/Web2/Web3.Topic" format="$name" separator=" &#187; " recurse="once"}%

---+++ include
<verbatim>
%BREADCRUMBS{"Web1/Web2/Web3.Topic"
  format="$name"
  separator=" &#187; "
  include="Web(1|3).*"}%
</verbatim>
%BREADCRUMBS{"Web1/Web2/Web3.Topic" format="$name" separator=" &#187; " include=".*(1|3).*"}%

---+++ exclude
<verbatim>
%BREADCRUMBS{"Web1/Web2/Web3.Topic"
  format="$name"
  separator=" &#187; "
  exclude="Web2"}%
</verbatim>
%BREADCRUMBS{"Web1/Web2/Web3.Topic" format="$name" separator=" &#187; " exclude="Web2"}%


---++ Plugin Installation Instructions
You do not need to install anything in the browser to use this extension. The following instructions are for the administrator who installs the extension on the server.

Open configure, and open the "Extensions" section. Use "Find More Extensions" to get a list of available extensions. Select "Install".

If you have any problems, or if the extension isn't available in =configure=, then you can still install manually from the command-line. See http://foswiki.org/Support/ManuallyInstallingExtensions for more help.


---++ Plugin Info
<!-- provided for compatibility only
   * Set SHORTDESCRIPTION = A flexible way to display breadcrumbs navigation
-->

|  Plugin Author: | Michael Daum |
|  Copyright &copy;: | 2006-2012, Michael Daum http://michaeldaumconsulting.com |
|  License: | GPL ([[http://www.gnu.org/copyleft/gpl.html][GNU General Public License]]) |
|  Release: | 2.43 |
|  Version: | 14082 (2012-02-24) |
|  Change History: | &nbsp; |
|  24 Feb 2012: | check access rights before extracting the !TopicTitle |
|  20 Aug 2009: | fixed usage of =$web= |
|  03 Jul 2009: | fixed fallback method to get the !TopicTitle without !DBCachePlugin |
|  29 Jun 2009: | use Foswiki !DBCachePlugin now |
|  17 Apr 2009: | converted to Foswiki |
|  07 Jan 2009: | fixed breadcrumbs breadcrumbs title for pattern skin |
|  11 Nov 2008: | hide <nop>WebHome in location breadcrumbs |
|  15 Sep 2008: | switching off current topic in =topicoff= mode |
|  01 Sep 2008: | Oliver Krueger Bugs:Item5972 fixed: minor cosmetics |
|  28 Apr 2008: | many new features for 2.0: topic titles, ellipsis, ... |
|  08 May 2007: | respect HOMETOPIC setting, don't hardcoded '<nop>WebHome' |
|  19 Apr 2007: | Crawford Currie added =topicformat= |
|  20 Feb 2007: | Crawford Currie added path breadcrumbs |
|  18 Dec 2006: | added $webtopic pseudo-parameter |
|  31 Aug 2006: | added NO_PREFS_IN_TOPIC;\
                  removed commonTagsHandler thus dropping cairo support |
|  08 Aug 2006: | fixed topic parents not showing up; don't show non-existing topics |
|  29 Jul 2006: | fixed infinit loop when a topic is its own parent topic |
|  28 Jul 2006: | initial version; \
                  don't add the topic parent '<nop>WebHome' to the path |
|  CPAN Dependencies: | none |
|  Other Dependencies: | none |
|  Perl Version: | 5.8 |
|  Plugin Home: | Foswiki:Extensions/%TOPIC% |
|  Support: | Foswiki:Support/%TOPIC% |
PackageForm edit

ExtensionClassification	Information structuring and Search, Interface and Visualisation
ExtensionType	PluginPackage
Compatibility
DemoUrl	http://michaeldaumconsulting.com
DevelopedInSVN	Yes
ModificationPolicy	CoordinateWithAuthor
Topic attachments
I	Attachment	Action	Size	Date	Who
md5	BreadCrumbsPlugin.md5	manage	0.2 K	24 Feb 2012 - 17:22	MichaelDaum
sha1	BreadCrumbsPlugin.sha1	manage	0.2 K	24 Feb 2012 - 17:22	MichaelDaum
tgz	BreadCrumbsPlugin.tgz	manage	8.4 K	24 Feb 2012 - 17:22	MichaelDaum
zip	BreadCrumbsPlugin.zip	manage	11.5 K	24 Feb 2012 - 17:22	MichaelDaum
EXT	BreadCrumbsPlugin_installer	manage	4.2 K	24 Feb 2012 - 17:22	MichaelDaum
Topic revision: r14 - 24 Feb 2012, MichaelDaum
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