Template:Namespace detect

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This template is used on approximately 140,000 pages.
To avoid major disruption and server load, any changes should be tested in the template's /sandbox or /testcases subpages, or in your own user subpage. The tested changes can be added to this page in a single edit. Consider discussing changes on the talk page before implementing them.

This template uses Lua:

Module:Namespace detect

This is the {{Namespace detect}} meta-template. It helps other templates detect what type of page they are on.

It detects and groups all the different namespaces used on Wikipedia into several types:

main: Main (i.e. article) space, where normal Wikipedia articles are kept.
talk: Any talk space, including page names that start with "Talk:", "User talk:", "File talk:", etc.

user
wikipedia
file
mediawiki
template
help
category
portal
book

The remaining namespaces.
other: Any namespaces that were not specified as a parameter to the template (see explanation below).

For backwards compatibility, this template handles image as if file. image ([[Image:...]]) is now deprecated.

Note: For most cases it may be better to use the simpler namespace detection templates (see the see also section below). This template is more prone to human errors such as misspelling parameter names.

1 Usage
2 Demospace and page
3 Parameters
4 Technical details
5 See also

Usage

This template takes one or more parameters named after the different page types as listed above. Like this:

{{Namespace detect
 | main  = Article text
 | talk  = Talk page text
 | other = Other pages text
}}

If the template is on a main (article) page, it will return this:

Article text

If the template is on any other page than an article or a talk page, it will return this:

Other pages text

The example above made the template return something for all page types. But if we don't use the other parameter or leave it empty, it will not return anything for the other page types. Like this:

{{Namespace detect
 | file     = File page text
 | category = Category page text
 | other    =
}}

On any pages other than file and category pages the code above will render nothing.

By using an empty parameter, you can make it so the template doesn't render anything for some specific page type. Like this:

{{Namespace detect
 | main  = 
 | other = Other pages text
}}

The code above will render nothing when on mainspace (article) pages, but will return this when on other pages:

Other pages text

Demospace and page

For testing and demonstration purposes, this template can take two parameters named demospace and page.

demospace understands any of the page type names used by this template, including the other type. It tells the template to behave like it is on some specific type of page. Like this:

{{Namespace detect
 | main  = Article text
 | other = Other pages text
 | demospace = main
}}

No matter on what kind of page the code above is used, it will return this:

Article text

The page parameter instead takes a normal pagename, making this template behave exactly as if on that page. The pagename doesn't have to be an existing page. Like this:

{{Namespace detect
 | user  = User page text
 | other = Other pages text
 | page  = User:Example
}}

No matter on what kind of page the code above is used, it will return this:

User page text

It can be convenient to let your template understand the demospace and/or page parameter and send it on to the {{Namespace detect}} template. Like this:

{{Namespace detect
 | main  = Article text
 | other = Other pages text
 | demospace = {{{demospace|}}}
 | page  = {{{page|}}}
}}

If both the demospace and page parameters are empty or undefined, the template will detect page types as usual.

Parameters

List of all parameters:

{{Namespace detect
| main  = 
...
| other =
| demospace = {{{demospace|}}} / main / talk / user /
              wikipedia / file / mediawiki / template /
              help / category / portal / book / other
| page  = {{{page|}}} / User:Example
}}

Note: Empty values to the "main" ... "book" parameters have special meaning.

Technical details

Namespace "Image" was renamed to "File" on 11 December 2008. This template was updated to understand both names well before that, thus it still works fine. For backwards compatibility it still understands "image" both as a parameter name, such as "image = File page text", and as a value "demospace = image".

Namespace "Book" was added to the English Wikipedia on 28 December 2009. This template has been updated so it detects the "Book:" namespace as type book. It already automatically detected "Book talk:" as type talk.

If you intend to feed tables as content to the numbered parameters of this template, you need to know this:

Templates have a problem handling parameter data that contains pipes "|" unless the pipe is inside another template {{name|param1}} or inside a piped link [[Wikipedia:Help:Template‏‎ |help]]. Thus templates can not handle wikitables as input unless you escape them by using the {{!}} template. This makes it hard to use wikitables as parameters to templates. Instead, the usual solution is to use "HTML wikimarkup" for the table code, which is more robust.

For more technical details, e.g. about copying this template to other projects and CSS-based namespace detection, see {{Main talk other}} and its talk page.