In MediaWiki templates how to show empty default value

Question

In a MediaWiki template I'm making, I want to let it to become [[CODE-value]] when CODE=value is used and empty when CODE=value is not given in the actual page. The current version

[[CODE-{{{CODE|}}}|{{{CODE|}}}]]

fails the second requirement. Any ideas?

Answer 1

Make sure the ParserFunctions extension is installed.

Then put the following in a template, such as Template:Iftest

{{#if: {{{CODE|}}} | [[CODE-{{{CODE}}}]] | (not applicable) }}

If CODE-parameter is empty or not present you get (not applicable). i.e.

• {{Iftest|CODE=123}} gives [[CODE-123]]

• {{Iftest|CODE=}} gives (not applicable)

• {{Iftest}} gives (not applicable)