Template:Qif/doc
Purpose and Function
Provides if then else functionality.
- Parameter else is optional.
- This template has undefined behaviour, if parameter test or then (or both) are missing.
- This template also has undefined behaviour, if any parameter (be it named or unnamed) that is different from test, then or else is defined when calling the template.
Note that {{qif}} does not work when subst'ed (like {{ifndef}}, the then part alone as in {{ifdef}} can be substituted).
Of course it's impossible to use vertical bars in parameter values directly, use either | or Template:! - the latter is only relevant for Wiki table delimiters.
Usage
{{qif
|test=VARIABLE_OR_PARAMETER_TO_TEST
|then=code if 'test' is not empty
|else=code if 'test' is empty
}}
Parameter else is optional. So you may also do:
{{qif
|test=VARIABLE_OR_PARAMETER_TO_TEST
|then=code if 'test' is not empty
}}
Note that if you are using Qif inside a template to determine if a template parameter has been defined with a non-empty value, you should test the parameter with an emnpty default.
Example:
{{qif
|test={{{Check|}}}
|then=Present
|else=Absent
}}
Inside a template defination, this will return "Present" if the enclosing template has a parameter "Check" with a non-empty value, and "Absent" otherwise.
Example
| Code | Result |
|---|---|
{{qif
|test={{boolne|foo|bar}}
|then=true
|else=false
}}
|
true |
{{qif
|test={{booleq|foo|bar}}
|then=true
|else=false
}}
|
false |
{{qif
|test=
|then=bar
}}
|
|
{{qif
|test=foo
|then=bar
}}
|
bar |
Source
This documentation (or its inital version, it may have been edited here since) is copied from Wikipedia:Template talk:Qif, under the GNU Free Documentation License (under which all wikipedia text is released). See that page amnt it's archives for related information and caveats.