Template talk:If defined
Documentation
Purpose
{{if defined}} — If a parameter of variable is defined, call the specified template with specified arguments.
Usage
{{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
}}
If called within another template, a typical usage is e.g.
- test={{{music|}}}
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
| Code | Result |
|---|---|
{{if defined
|test=hello
|call=foreach
|1=call=show1
|2=separator=, 
|3=1=this
|4=2=is
|5=3=a
|6=4=test
}}
|
Template:Foreach |
{{if defined
|test=
|call=foreach
|1=call=show1
|2=separator=, 
|3=1=this
|4=2=is
|5=3=a
|6=4=test
}}
|
|
{{if defined
|call=foreach
|1=call=show1
|2=separator=, 
|3=1=this
|4=2=is
|5=3=a
|6=4=test
}}
|
Template:Foreach |
{{if defined
|test=hello
|1=call=show1
|2=separator=, 
|3=1=this
|4=2=is
|5=3=a
|6=4=test
}}
|
|
{{if defined
|test={{{hello}}}
|call=foreach
|1=call=show1
|2=separator=, 
|3=1=this
|4=2=is
|5=3=a
|6=4=test
}}
|
Template:Foreach |
See also
- Template:Unless defined
- Template:Tiw - applies "If defined"
- Category:If Templates
History
Copied form Wikipedia: http://en.wikipedia.org/wiki/Template:If_defined
