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Template:Category pair

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Warning This template is used on approximately 2,000 pages and changes may be widely noticed. Test changes in the template's /sandbox or /testcases subpages, or in your own user subpage. Consider discussing changes on the talk page before implementing them.
This template uses Lua:

Usage

Typical usage should be on dissimilar preceding/succeeding categories, or where a large gap exists in otherwise sequential categories. For similarly named sequential categories with gaps less than 5 years, use {{Category series navigation}} instead, and {{Category series navigation|skip-gaps=yes}} for gaps up to 15 years from the parent.

  • For 2 adjacent categories, a preceding Category:NAME1, and a succeeding Category:NAME2, place:
{{Category pair|NAME1|NAME2}}
at the top of the category page. Each category is displayed only if it exists. If neither category exists, nothing will be displayed.
  • If there is no succeeding category, you may simply place:
{{Category pair|NAME1}}
at the top of the category page.
  • If there is no preceding category, then leave the first parameter empty, and simply place:
{{Category pair||NAME2}}
at the top of the category page.

Examples

Preceding and succeeding categories, both exist
Preceding category only, which exists
Succeeding category only, which exists
Preceding and succeeding categories, only preceding exists
Preceding and succeeding categories, only succeeding exists
Two non-existent categories, so no output

Error checking

Only the first two parameters are processed, others are ignored.

If more than two parameters are supplied, a warning message is shown when the page is previewed. When it is saved, the page is added to the hidden tracking category: Category:Pages using category pair with more than 2 parameters.

If more than two parameters are supplied, the template is unlikely to do what the editor intended. For Category:NAME1, Category:NAME2, and Category:NAME3, for example:

  • {{Category pair|NAME1|NAME2|NAME3}} will ignore Category:NAME3, and
  • {{Category pair|NAME1||NAME2}} will ignore Category:NAME2, because a duplicate | character between the two categories causes Category:NAME2 to be the third parameter rather the second.

Tracking categories

If neither parameter is a category which currently exists the template will produce no output. This is not necessarily an error; the other categories may simply be part of an incomplete series which will be completed in due course
See above: Error checking

See also

The above documentation is transcluded from Template:Category pair/doc. (edit | history)
Editors can experiment in this template's sandbox (edit | diff) and testcases (edit) pages.
Add categories to the /doc subpage. Subpages of this template.

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