Difference between revisions of "Template:Category pair"

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imported>WOSlinker
(separate pp-template not needed)
imported>BrownHairedGirl
(if neither category exists, display nothing)
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{{Hatnote
+
{{#ifexist:Category:{{{1|}}}|<!--
| See also <includeonly>{{#ifexist:Category:{{{1|}}}|</includeonly>the preceding [[:Category:{{{1}}}]] <includeonly>{{#ifexist:Category:{{{2|}}}|</includeonly> and <includeonly>}}}} {{#ifexist:Category:{{{2|}}}|</includeonly>the succeeding [[:Category:{{{2}}}]]<includeonly>}}</includeonly>
+
#Cat1 exists, so invoke the core
}}<noinclude>
+
-->{{Category pair/core|{{{1|}}}|{{{2|}}}}}<!--
 +
-->|<!--
 +
#Cat1 non-existent, so check if  Cat2exists
 +
-->{{#ifexist:Category:{{{2|}}}|<!--
 +
#Cat2 exists, so invoke the core
 +
-->{{Category pair/core|{{{1|}}}|{{{2|}}}}}<!--
 +
-->|<!--
 +
# Neither Cat1 nor Cat2 exists, so do nothing
 +
-->}}}}<noinclude>
 
{{documentation}}
 
{{documentation}}
 
</noinclude>
 
</noinclude>

Revision as of 01:42, 22 February 2018

50px Template documentation[view] [edit] [history] [purge]

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.

  • 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
  • {{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

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