created: 20230518124403282
modified: 20230518135109977
tags: ParametersWidget
title: ParametersWidget (Examples)

''Example i'': Shows transclusion of [[Sample Tiddler Template]]. The template tiddler has two parameters `name` and `age` and here their default values are used.

<$macrocall $name=".example" n="1" eg="""<$transclude $tiddler="Sample Tiddler Template" />"""/>

''Example ii'': Shows, another transclusion of [[Sample Tiddler Template]], here the value of `age` is passed, but `name` uses its default value.

<$macrocall $name=".example" n="2" eg="""<$transclude $tiddler="Sample Tiddler Template" age=33/>"""/>

''Example iii'': Shows, another transclusion of [[Sample Tiddler Template]], here the value of both `name` and `age` are passed.

<$macrocall $name=".example" n="3" eg="""<$transclude $tiddler="Sample Tiddler Template" age=45 name="Jeremy Ruston" />"""/>

In the simple form the above transclusion is equivalent to

<$macrocall $name=".example" n="3.1" eg="""{{Sample Tiddler Template|Jeremy Ruston|45}}"""/>

In this simple form, parameters passed by position not by name. So the first value is passed to the first parameter, here `name` and the second value is passed to the second parameter, here `age`.

''Remarks''

# Passing parameter by name is good practice and is recommended for clarity. So for parameterized transclusions, the use of <<.wid transclude>> is recommended over simple form transclusion.
# However, if parameter values are passed by position, parameters get assigned sequentially based on the order <<.wlink ParametersWidget>> widgets are discovered.

''Example iv'': Here the <<.wlink ParametersWidget>> widget is used to declare a parameter whose default value is transcluded from another tiddler.

<$macrocall $name=".example" n="4" eg="""\procedure myproc()
<$parameters name={{$:/SiteTitle}} age="21">
My name is <<name>> and my age is <<age>>.
</$parameters>
\end

<$transclude $variable="myproc" age="19"/>
"""/>

''Example v'': Here the <<.wlink ParametersWidget>> widget is used in addition to other parameter declarations, because later parameters depend on the value of earlier parameters. Positional values are assigned sequentially.

<$macrocall $name=".example" n="5" eg="""\procedure myproc(age: 22)
<$parameters acceptable-age={{{ [<age>divide[2]add[7]] }}} >
If you're <<age>>, you can date a <<acceptable-age>>-year-old and it's not weird.
</$parameters>
\end

<<myproc>>
<<myproc 30>>
<<myproc 35 70>>
""" />