Template:Category pair
 | 此模板使用Lua语言： |
Usage
Place
{{Category pair|CATEGORY NAME1|CATEGORY NAME2}}
on the top of the category page, replacing "CATEGORY NAMEn" with the names only of the target categories, leaving out the term "Category:".
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|CATEGORY NAME1}}
on the top of the category page, replacing "CATEGORY NAME1" with the name only of the target category, leaving out the term "Category:".
If there is no preceding category, then leave the first parameter empty, and simply place:
{{Category pair| |CATEGORY NAME2}}
on the top of the category page, replacing "CATEGORY NAME2" with the name only of the target category, leaving out the term "Category:".
Examples
- Preceding and succeeding categories, both exist
{{Category pair|19世纪|21世纪}}→{{Category pair|20世纪|22世纪}}→
- Preceding category only, which exists
{{Category pair|20世纪}}→
- Succeding category only, which exists
{{Category pair||5世纪}}→
- Preceding and succeeding categories, only preceding exists
{{Category pair|7世纪|N世纪}}→
- Preceding and succeeding categories, only succeeding exists
{{Category pair|X世纪|5世纪}}→
- Two non-existent categories, so no output
{{Category pair|81世纪|83rd century}}→
Error checking
If more than two parameters are supplied, a warning message is shown when the page is previewed and when it is saved the page is added to a hidden tracking category: Category:Pages using Template:Category pair with more than 2 parameters.
Only the first two parameters are processed. Others are ignored.
If more than two parameters are supplied, the template is unlikely to do what the editor intended e.g.
{{tlx|Category pair|CATEGORY NAME1|CATEGORY NAME2|CATEGORY NAME3}}will ignore CATEGORY NAME3{{tlx|Category pair|CATEGORY NAME1||CATEGORY 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