Editing Template:Hatnote/doc

{{Documentation subpage}}
The hatnotes used for adding links between articles where more context is important.
Broadly speaking, a hatnote should answer a readers' question: Am I on the right page?

== Usage ==

; Basic usage:
 &#123;{hatnote|''text''}}

; All parameters:
 &#123;{hatnote|''text''|extraclasses=''extra classes''|selfref=''yes''|category=''no''}}

== Parameters ==

This template accepts the following parameters:
* <code>1</code> - the hatnote text (required)
* <code>extraclasses</code> - any extra CSS classes to be added.
* <code>selfref</code> - If set to "yes", "y", "true" or "1", adds the CSS class "selfref". This is used to denote self-references.
* <code>category</code> - If set to "no", "n", "false", or "0", suppresses the error tracking category ([[:Category:Hatnote templates with errors]]). This has an effect only if the leftmost parameter (the hatnote text) is omitted.

== Example ==

* <code><nowiki>{{hatnote|Example hatnote text}}</nowiki></code> → {{hatnote|Example hatnote text}}

== Typical types ==
{{T|Main}}, {{T|Further}} are very similar, but indicate either the primary page for a topic or more detailed related topic. They have a nearly identical set of parameters.

;{{T|Main}}: When an article is large, it often has a summary and a link to a main article. This template is used after the heading of the summary, to indicate a link to the subtopic article that has been summarized.
;{{T|Further}}: Used to link to articles containing further information on this topic.
;{{T|See also}}: Used to link to additional articles on related topics.

:;{{T|Main|Main Page}}  →:{{Main|Main Page}}
:;{{T|Main|Main Page|Main Page}}  →:{{Main|Main Page|Main Page}}

:*<code>1</code>, <code>2</code>, <code>3</code>, ... – the pages to link to. If no page names are specified, the current page name is used instead (without the namespace prefix). Categories and files are automatically escaped with the [[Help:Colon trick|colon trick]], and links to sections are automatically formatted as ''page § section'', rather than the MediaWiki default of ''page#section''.
:*<code>l1</code>, <code>l2</code>, <code>l3</code>, ... ''or''<code>label 1</code>, <code>label 2</code>, <code>label 3</code>, ... – optional labels for each of the pages to link to (this is for articles where a piped link would be used). Note that the extra parameters use a lower case 'L', for example, <code>l1</code>, <u>not</u> <code>L1</code>.
:*<code>selfref</code> – if set to "yes", "y", "true" or "1", adds the CSS class "selfref". This is used to denote self-references.


== Disambiguation ==
Templates such as {{T|About}} and {{T|For}} are to be used in cases where a disambiguation is not needed. In general, disambiguation pages should only be used for 4 or more titles that are mostly or entirely identical, except for a qualifier.
;{{T|About}}: Links the reader to other articles with similar titles or concepts that they may have been seeking instead. The template has several formats, including:
:;{{T|About|Use1}} →:{{About|}}
:;{{T|About|Use1|<nowiki/>|Main Page}} →:{{About|Use1||Main Page}}
:;{{T|About|Use1|<nowiki/>|Main Page|and|Main Page}} →:{{About|Use1||Main Page|and|Main Page}}
:;{{T|About|Use1|Use2|Main Page}} →:{{About|Use1|Use2|Main Page}}
:;{{T|About|Use1|Use2|Main Page|and|Main Page}} →:{{About|Use1|Use2|Main Page|and|Main Page}}
:;{{T|About|Use1|Use2|Main Page|other uses}} →:{{About|Use1|Use2|Main Page|other uses}}

Alternately, a <code>section=yes</code> parameter can be added to the {{T|About}} template for use at the top of a section. When using this parameter, the wording in the template changes to specify that it is being used in a section:
:;{{T|About|Use1|<nowiki>section=yes</nowiki>}} →:{{About|Use1|section=yes}}
:;{{T|About|Use1|<nowiki/>|Main Page|<nowiki>section=yes</nowiki>}} →:{{About|Use1||Main Page|section=yes}}
:;{{T|About|Use1|Use2|Main Page|<nowiki>section=yes</nowiki>}} →:{{About|Use1|Use2|Main Page|section=yes}}
:;{{T|About|Use1|Use2|Main Page|and|Main Page|<nowiki>section=yes</nowiki>}} →:{{About|Use1|Use2|Main Page|and|Main Page|section=yes}}
:;{{T|About|Use1|Use2|Main Page|other uses|<nowiki>section=yes</nowiki>}} →:{{About|Use1|Use2|Main Page|other uses|section=yes}}

A <var>text</var> option adds text to the end; note that this should be only used when truly necessary, and the other hatnote templates listed below don't suffice. This template also supports <var>selfref</var>.

;{{T|For}}: Provides links to up to four articles or disambiguation pages. It accepts zero to five parameters. 

:;If used without parameters on a page named ''Foo'', the result is
::{{hatnote|For other uses, see [[:Foo (disambiguation)]].}}
:;The first parameter changes the hatnote itself and should be plain text, e.g. {{T|For|similar terms}} yields
::{{hatnote|For similar terms, see [[:Foo (disambiguation)]].}}
:;The second parameter is used to change the resultant link, e.g. {{T|For|similar terms|Main Page}} yields
::{{For|similar terms|Main Page}}
:;The third, fourth and fifth parameters are used to give one, two, or three supplementary links:
:*{{For|similar terms|Main Page|Main Page}}
:*{{For|similar terms|Main Page|Main Page|Main Page}}
:*{{For|similar terms|Main Page|Main Page|Main Page|Main Page}}
:the last being produced by e.g. {{T|For|similar terms|Main Page|Main Page|Main Page|Main Page}}.

== Errors ==

If no hatnote text is supplied, the template will output the following message:
* {{hatnote|category=no}}

If you see this error message, it is for one of four reasons:
# No parameters were specified (the template code was <code><nowiki>{{hatnote}}</nowiki></code>). Please use <code><nowiki>{{hatnote|</nowiki>''text''<nowiki>}}</nowiki></code> instead.
# Some parameters were specified, but the hatnote text wasn't included. For example, the template text <code><nowiki>{{hatnote|extraclasses=seealso}}</nowiki></code> will produce this error. Please use (for example) <code><nowiki>{{hatnote|</nowiki>''text''<nowiki>|extraclasses=seealso}}</nowiki></code> instead.
# The hatnote text was specified, but that text contains an equals sign ("="). The equals sign has a special meaning in template code, and because of this it cannot be used in template parameters that do not specify a parameter name. For example, the template code <code><nowiki>{{hatnote|2+2=4}}</nowiki></code> will produce this error. To work around this, you can specify the parameter name explicitly by using <code>1=</code> before the hatnote text, like this: <code><nowiki>{{hatnote|1=2+2=4}}</nowiki></code>.
# You tried to access [[Module:Hatnote]] directly by using <code><nowiki>{{#invoke:hatnote|hatnote|</nowiki>''text''<nowiki>}}</nowiki></code>. Use of #invoke in this way has been disabled for performance reasons. Please use <code><nowiki>{{hatnote|</nowiki>''text''<nowiki>}}</nowiki></code> instead.

Pages that contain this error message are tracked in [[:Category:Hatnote templates with errors]].


== Technical details ==
This template uses the [[Help:Lua|Lua templating language]], and more information can be found [[w:c:dev:Global_Lua_Modules/Hatnote|on the Global Lua Module page]]. '''For a traditional wikitext version of this template, see [[w:c:templates:Template:Hatnote|Hatnote on Templates Wiki]]'''.

The HTML code produced by this template looks like this:

* <code><nowiki><div role="note" class="hatnote"></nowiki>''hatnote text''<nowiki></div></nowiki></code>

<includeonly>[[Category:Hatnote templates|{{PAGENAME}}]]</includeonly>