Help:Parser functions in templates - Revision history

Admin: /* See also */

Admin — Wed, 14 Oct 2009 08:40:26 GMT

Admin at 08:40, 14 October 2009

Admin — Wed, 14 Oct 2009 08:40:13 GMT

← Older revision		Revision as of 08:40, 14 October 2009
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-	When applying ~~[[Help:Extension:~~ParserFunctions~~\|ParserFunctions]]~~ to ~~[[Help:Template\|~~template]] parameters, a pipe symbol ("\|") may be used to provide the empty string as default value, in order to indicate how to handle things if a parameter is or is not passed in.	+	When applying ParserFunctions to template parameters, a pipe symbol ("\|") may be used to provide the empty string as default value, in order to indicate how to handle things if a parameter is or is not passed in.

	*<tt><nowiki>{{{1}}}</nowiki></tt>		*<tt><nowiki>{{{1}}}</nowiki></tt>
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	==See also==		==See also==
-	*[[Help:Extension:ParserFunctions]]
	*[[Help:Template]]		*[[Help:Template]]

Admin at 18:49, 11 October 2009

Admin — Sun, 11 Oct 2009 18:49:47 GMT

← Older revision		Revision as of 18:49, 11 October 2009
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	*[[Help:Extension:ParserFunctions]]		*[[Help:Extension:ParserFunctions]]
	*[[Help:Template]]		*[[Help:Template]]
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-	~~[[Category:Help\|Parser functions in templates]]~~

Anonymous: 1 revision

Anonymous — Tue, 04 Aug 2009 05:18:00 GMT

1 revision

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Revision as of 05:18, 4 August 2009

67.177.186.240 at 14:27, 12 July 2009

67.177.186.240 — Sun, 12 Jul 2009 14:27:37 GMT

New page

When applying [[Help:Extension:ParserFunctions|ParserFunctions]] to [[Help:Template|template]] parameters, a pipe symbol ("|") may be used to provide the empty string as default value, in order to indicate how to handle things if a parameter is or is not passed in.

*<tt><nowiki>{{{1}}}</nowiki></tt>

:;Sample A: <tt><nowiki>{{#if: {{{1}}} | Parameter 1 is not defined, or is defined and non-null/non-empty. | Parameter 1 is null. It contains only empty string(s) or breaking space(s) etc.}}</nowiki></tt>

:;Result: <tt>{{#if: {{{1}}} | Parameter 1 is not defined, or is defined and non-null/non-empty. | Parameter 1 is null. It contains only empty string(s) or breaking space(s) etc.}}</tt>

*<tt><nowiki>{{{1|}}}</nowiki></tt>

:;Sample B: <tt><nowiki>{{#if: {{{1|}}} | Parameter 1 is defined and non-null/non-empty. | Parameter 1 is not defined, or is defined but null. It contains only empty string(s) or breaking space(s) etc.}}</nowiki></tt>

:;Result: <tt>{{#if: {{{1|}}} | Parameter 1 is defined and non-null/non-empty. | Parameter 1 is not defined, or is defined but null. It contains only empty string(s) or breaking space(s) etc.}}</tt>

;Comparison
{| class="wikitable"
! Condition of parameter 1
! Sample A: <nowiki>{{{1}}}</nowiki>
! Sample B: <nowiki>{{{1|}}}</nowiki>
|-
|not defined||'''TRUE'''||''FALSE''
|-
|defined but null/empty||''FALSE''||''FALSE''
|-
|defined and NOT null/empty||'''TRUE'''||'''TRUE'''
|-
|}

The second usage (<nowiki>{{{1|}}}</nowiki>) is often the desired way to handle situations where a parameter exists, but is comprised only of empty space.

==See also==
*[[Help:Extension:ParserFunctions]]
*[[Help:Template]]

[[Category:Help|Parser functions in templates]]