Template:Category pair/doc

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 {{Navseasoncats}} instead, and {{Navseasoncats|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

• {{Category pair|1934 FIFA World Cup|1950 FIFA World Cup}} →

Preceding category only, which exists

• {{Category pair|1934 FIFA World Cup}} →

Succeeding category only, which exists

• {{Category pair||1950 FIFA World Cup}} →

Preceding and succeeding categories, only preceding exists

• {{Category pair|1934 British Empire Games|1942 British Empire Games}} →

Preceding and succeeding categories, only succeeding exists

• {{Category pair|1946 British Empire Games|1954 British Empire and Commonwealth Games}} →

Two non-existent categories, so no output

• {{Category pair|AD 10 FIFA World Cup|AD 18 FIFA World Cup}} →

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

• Category:Pages using category pair with no output (0)

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

• Category:Pages using category pair with more than 2 parameters (0)

See above: Error checking

See also

• {{Navseasoncats}} — for similarly named sequential categories
• {{Preceding category}}
• {{Succeeding category}}