%audience% authors (intermediate)
Every WikiGroup can have `GroupHeader and `GroupFooter pages that contain markup that should be included at the beginning or end of each page within the group. This feature is useful for:

• adding a disclaimer or heading to all of the pages of a group
• defining custom WikiStyles that may be used for all pages in a group
• replacing the default headers and/or footers for pages in a group (e.g., using (:noheader:) and or (:nofooter:) -- see PageDirectives).

To create a group header, just create a new page called YourGroup.GroupHeader. Group headers allow authors to create groups with custom headers and footers without having to coordinate with a wiki administrator.

The default `GroupHeader or `GroupFooter can be suppressed on an individual page (such as a group's `HomePage) by using the (:nogroupheader:) and (:nogroupfooter:) markups on that page.

If a generic `GroupHeader is used in one wikigroup (say, the Site wikigroup), then the code can be easily duplicated in the `GroupHeader of any other group by using
(:include Site.GroupHeader:). See IncludeOtherPages.

%trail%<<|DocumentationIndex|>>

>>faq<<

Q: How do I set one header for all pages/groups?
A: The header for each page is controlled by the $GroupHeaderFmt variable. Thus a site-wide groupheader can be added with
->

$GroupHeaderFmt = '(:include {$SiteGroup}.SiteHeader basepage={*$FullName}:)(:nl:)' . $GroupHeaderFmt;

See also the Cookbook:AllGroupHeader page.

A: Any form of markup is valid in $GroupHeaderFmt, thus one can do

->$GroupHeaderFmt .= "Global markup text here.";