Template:Category if exists/sandbox

This is the template sandbox page for Template:Category if exists (diff).
See also the companion subpage for test cases.

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This template is used on approximately 32,000 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.

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)

Shortcut

{{Category ifexist}}

This template uses Lua:

Module:If not given or empty

This template outputs a category if the category exists. Otherwise, it returns nothing. It is intended for use in templates.

This template follows category redirects (using {{resolve category redirect}}).

TemplateData

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

TemplateData for Category if exists

Outputs a link to a category if it exists; otherwise returns nothing.

Template parameters[Edit template data]
This template prefers inline formatting of parameters.
Parameter		Description	Type	Status
Category name	`1`	Category for potential inclusion if it exists. "Category:" prefix is optional. Example Category:Writers	Page name	required
Sort key	`2`	[[WP:SORTKEY]] of the category. Suggested values `*` Example Foo	Line	optional