Template:If then show/doc

This template tests whether the first unnamed parameter is not an empty string and returns it if it does. Otherwise it returns the second unnamed parameter.

This is 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, for example.

The optional third and fourth unnamed parameters provide a prefix and a suffix for the first parameter when returned. This enables the designer to construct more complex templates that still only use one invoke of a Lua module.

Usage

(P26) for (Q151973)

{{If then show|{{#invoke:WikidataIB|getValue|P26|qid=Q151973|fwd=ALL|osd=no}}|unmarried}} → unmarried

(P26) for (Q905)

{{If then show|{{#invoke:WikidataIB|getValue|P26|qid=Q905|fwd=ALL|osd=no}}|unmarried}} → unmarried

Prefix and suffix

A table can be designed to display a row only when a particular property of the article exists on Wikidata.

(P26) for (Q151973)

<syntaxhighlight lang="html">

Label	Value

</syntaxhighlight>

→

Label	Value

(P26) for (Q905)

<syntaxhighlight lang="html">

Label	Value

</syntaxhighlight>

→

Label	Value