Template:If then wikilink/doc
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 | This is a documentation subpage for Template:If then wikilink. It contains usage information, categories and other content that is not part of the original template page. |
If the first unnamed parameter is not an empty string, the template returns it as a piped wiki-link using the |prefix= as a namespace or interwiki prefix. Otherwise it returns the second unnamed parameter.
This is only useful when the first parameter is a {{#invoke: }} of a Lua module that may return a value or nothing. Because it uses the {{#invoke: }} just once, it simplifies the coding of infoboxes and reduces the calls to a module.
Example[edit source]
{{If then wikilink |{{#invoke:WikidataIB |getSiteLink |wiki=enwikisource |qid=Q56862211}} | prefix=s:en:}}→ [[s:en:Lua error in Module:WikidataIB at line 467: attempt to index field 'wikibase' (a nil value). |Lua error in Module:WikidataIB at line 467: attempt to index field 'wikibase' (a nil value). ]]