Template:IfwpEdit This Page
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This template allows branching without mw:Extension:ParserFunctions.
It uses the code {{{3{{{1}}}{{{1{{{1}}}{{{2}}}}}}}}}
Cases:
 If {{{1}}} is defined and not empty, this reduces to
{{{2}}}
 If {{{1}}} is defined and empty, this reduces to
{{{3}}}
 If {{{1}}} is undefined, this reduces to
{{{3{{{2}}}}}}
If the intention is to treat empty and undefined as equivalent, then:
If {{{1}}} is defined, we successfully avoid different results for {{{2}}} undefined or empty, and for {{{3}}} undefined or empty.
If {{{1}}} is undefined and {{{3}}} is defined, we successfully avoid different results for {{{2}}} undefined or empty.
If {{{1}}} and {{{3}}} are undefined, we successfully avoid different results for {{{2}}} undefined or empty.
If {{{1}}} is undefined and {{{2}}} is defined, we have {{{2}}} for {{{3}}} undefined, but empty for {{{3}}} empty. This is different if {{{2}}} is defined and not empty!
If {{{1}}} and {{{2}}} are undefined, we successfully avoid different results for {{{3}}} undefined or empty.
If {{{2}}} is defined and not empty and {{{3}}} is undefined, we get {{{2}}} if {{{1}}} is undefined, but empty if {{{1}}} is empty!
Summarizing: there is one deviating result: if {{{2}}} is defined and not empty, we get this value if {{{1}}} and {{{3}}} are both undefined, but not if one of both are empty.
With ParserFunctions we can use {{#if:{{{1}}}{{{2}}}{{{3}}}}}
.
Examples
Code  Result 
{{ifwpxyz}}

y 
{{ifwpyz}}

z 
{{ifwpxz}}


{{ifwpxy}}

y 
{{ifwpx}}


{{ifwpy}}


{{ifwpz}}

z 
{{ifwp}}


{{ifwp2=y3=z}}

z 
{{ifwp1=x3=z}}


{{ifwpxy}}

y 
{{ifwp2=3=z}}

z 
{{ifwp1=3=z}}

z 
{{ifwpy}}


{{ifwp2=y3=}}


{{ifwp1=x3=}}


{{ifwpx}}


{{ifwp2=3=}}


{{ifwp1=3=}}


{{ifwp}}


{{ifwpx}}


{{ifwp2=y}}

y 
{{ifwp3=z}}

z 
{{ifwp}}


{{ifwp2=}}


{{ifwp3=}}


{{ifwp}}

See also
The above documentation is transcluded from Template:Ifwp/doc. (edit  history) Editors can experiment in this template's sandbox (create  mirror) and testcases (create) pages. Please add categories to the /doc subpage. Subpages of this template. 
 This page was last modified on 28 April 2012, at 09:50.
 This page has been accessed 242 times.
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