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


fails the second requirement. Any ideas?

  • 1
    Have a look at {{#if}}.
    – svick
    Commented Oct 1, 2014 at 17:05
  • Using {{#if: {{{CODE}}} | [[CODE-{{{CODE}}}]] | (not applicable) }} in the template still does not work. Any additional hint?
    – qazwsx
    Commented Oct 1, 2014 at 21:50
  • I think you need {{#if: {{{CODE|}}}, so that the condition is empty when CODE is not set.
    – svick
    Commented Oct 1, 2014 at 22:11
  • That didn't work. I'm using this code in a template. That's probably problematic?
    – qazwsx
    Commented Oct 1, 2014 at 22:28

1 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)

  • This does not work in a template.
    – qazwsx
    Commented Oct 16, 2014 at 20:14
  • How are you calling your template and passing it the value of CODE? Commented Oct 17, 2014 at 7:33
  • Yes, I put the code you showed into a template, and created a new page applying the template with some value assigned to parameter CODE. It does not show desired output.
    – qazwsx
    Commented Oct 17, 2014 at 17:03
  • That is odd. Have you got a link to the live example of your template? Commented Oct 17, 2014 at 20:15
  • Ah. Looks like that wiki doesn't have the ParserFunctions extension installed. That extension is required for #if to work. Commented Oct 18, 2014 at 15:49

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