Template:If in category/doc

This is a documentation subpage for Template:If in category.
It may contain usage information, categories and other content that is not part of the original template page.

This template is used on approximately 170,000 pages.
To avoid major disruption and server load, any changes should be tested in the template's /sandbox or /testcases subpages, or in your own user subpage. The tested changes can be added to this page in a single edit. Consider discussing changes on the talk page before implementing them.

Due to a server limit of 500 "expensive parser function" calls (e.g. #ifexist:, PAGESIZE:, and PAGESINCATEGORY:), this template will only work properly if the page using it has not already exceeded the limit. When the limit is exceeded, the page using this template or module is categorised in Category:Pages with too many expensive parser function calls. (further information)

This template uses Lua:

Module:If in category (sandbox)

This template checks if a page is in a given category. The syntax is:

{{If in category|category name|output if the page is in the category|output if the page is NOT in the category|page=page name to test}}

Usage notes

If no |page= parameter is supplied, it defaults to the current page
The category name parameter treats Foo and Category:Foo as equivalent
If neither output parameter is specified, it outputs yes if true and the empty string if false

Examples

Note: This page is in Category:X1.

{{If in category|page=Amastra subsoror|Extinct gastropods|Dead as the dodo|Perhaps it's still alive}} → Dead as the dodo
{{If in category|page=Amastra subsoror|Category:Extinct gastropods|Dead as the dodo|Perhaps it's still alive}} → Dead as the dodo
{{If in category|page=Amastra subsoror|Extinct gastropods}} → yes
{{If in category|X1}} → yes
{{If in category|X2}} →

TemplateData

This is the TemplateData for this template used by TemplateWizard, VisualEditor and other tools. See a monthly parameter usage report for Template:If in category in articles based on its TemplateData.

TemplateData for If in category

Checks whether a page is in a category, and returns different output based on the answer.

Template parameters
This template prefers inline formatting of parameters.
Parameter		Description	Type	Status
Category	`1`	Category being checked to see if the page is in it; "Category:" prefix is optional Example Category:X1	Page name	required
If yes	`2`	Output if the page is in the category. If neither "If yes" nor "If no" are set, defaults to "yes".	Content	suggested
If no	`3`	Output if the page is not in the category	Content	suggested
Page	`page`	Page being checked. Defaults to the current page. Default FULLPAGENAME	Page name	optional