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2005-12-27T01:51:44Z

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==Documentation==
=== Purpose ===

{{[[template:if defined|if defined]]}} — If a parameter of variable is defined, call the specified template with specified arguments.



=== Usage ===
<pre>
{{if defined
|test=expression to test
|call=template to call if test is not empty
|1=parameter_1_name=parameter_1_value
|2=parameter_2_name=parameter_2_value
|...
|150=parameter_150_name=parameter_150_value
}}
</pre>

If called within another template, a typical usage is e.g.
:<nowiki>test={{{music|}}}</nowiki>
The result is empty both if the parameter music is undefined, and if it is empty.

Note that if the parameter music is undefined, the text "{{{music}}}" (without "|") is a non-empty text, so in this case the call template is called.



=== Example ===
{| class="wikitable"
! Code
! Result
|- style="vertical-align:top;"
| <pre>
{{if defined
|test=hello
|call=foreach
|1=call=show1
|2=separator=,&#32;
|3=1=this
|4=2=is
|5=3=a
|6=4=test
}}
</pre>
||{{if defined
|test=hello
|call=foreach
|1=call=show1
|2=separator=, 
|3=1=this
|4=2=is
|5=3=a
|6=4=test
}}
|- style="vertical-align:top;"
| <pre>
{{if defined
|test=
|call=foreach
|1=call=show1
|2=separator=,&#32;
|3=1=this
|4=2=is
|5=3=a
|6=4=test
}}
</pre>
||{{if defined
|test=
|call=foreach
|1=call=show1
|2=separator=, 
|3=1=this
|4=2=is
|5=3=a
|6=4=test
}}
|- style="vertical-align:top;"
| <pre>
{{if defined
|call=foreach
|1=call=show1
|2=separator=,&#32;
|3=1=this
|4=2=is
|5=3=a
|6=4=test
}}
</pre>
||{{if defined
|call=foreach
|1=call=show1
|2=separator=, 
|3=1=this
|4=2=is
|5=3=a
|6=4=test
}}
|- style="vertical-align:top;"
| <pre>
{{if defined
|test=hello
|1=call=show1
|2=separator=,&#32;
|3=1=this
|4=2=is
|5=3=a
|6=4=test
}}
</pre>
||{{if defined
|test=hello
|1=call=show1
|2=separator=, 
|3=1=this
|4=2=is
|5=3=a
|6=4=test
}}
|- style="vertical-align:top;"
| <pre>
{{if defined
|test={{{hello}}}
|call=foreach
|1=call=show1
|2=separator=,&#32;
|3=1=this
|4=2=is
|5=3=a
|6=4=test
}}
</pre>
||{{if defined
|test={{{hello}}}
|call=foreach
|1=call=show1
|2=separator=, 
|3=1=this
|4=2=is
|5=3=a
|6=4=test
}}
|}


=== See also ===
* [[Template:Unless defined]]
* {{tiw|Infobox_Film}} - applies "If defined"
* [[:Category:If Templates]]

=== History ===
; Created : â†’[[User:AzaToth|Aza]][[User_talk:AzaToth|Toth]] 20:43, 4 December 2005 (UTC)

Copied form Wikipedia: http://en.wikipedia.org/wiki/Template:If_defined
== Discussion ==

Template talk:If defined - Revision history

Thinker: copied from Wikipedia