52 lines
2.4 KiB
Plaintext
52 lines
2.4 KiB
Plaintext
created: 20230518124403282
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modified: 20230518135109977
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tags: ParametersWidget
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title: ParametersWidget (Examples)
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''Example i'': Shows transclusion of [[Sample Tiddler Template]]. The template tiddler has two parameters `name` and `age` and here their default values are used.
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<$macrocall $name=".example" n="1" eg="""<$transclude $tiddler="Sample Tiddler Template" />"""/>
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''Example ii'': Shows, another transclusion of [[Sample Tiddler Template]], here the value of `age` is passed, but `name` uses its default value.
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<$macrocall $name=".example" n="2" eg="""<$transclude $tiddler="Sample Tiddler Template" age=33/>"""/>
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''Example iii'': Shows, another transclusion of [[Sample Tiddler Template]], here the value of both `name` and `age` are passed.
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<$macrocall $name=".example" n="3" eg="""<$transclude $tiddler="Sample Tiddler Template" age=45 name="Jeremy Ruston" />"""/>
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In the simple form the above transclusion is equivalent to
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<$macrocall $name=".example" n="3.1" eg="""{{Sample Tiddler Template|Jeremy Ruston|45}}"""/>
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In this simple form, parameters passed by position not by name. So the first value is passed to the first parameter, here `name` and the second value is passed to the second parameter, here `age`.
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''Remarks''
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# Passing parameter by name is good practice and is recommended for clarity. So for parameterized transclusions, the use of <<.wid transclude>> is recommended over simple form transclusion.
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# However, if parameter values are passed by position, parameters get assigned sequentially based on the order <<.wlink ParametersWidget>> widgets are discovered.
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''Example iv'': Here the <<.wlink ParametersWidget>> widget is used to declare a parameter whose default value is transcluded from another tiddler.
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<$macrocall $name=".example" n="4" eg="""\procedure myproc()
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<$parameters name={{$:/SiteTitle}} age="21">
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My name is <<name>> and my age is <<age>>.
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</$parameters>
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\end
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<$transclude $variable="myproc" age="19"/>
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"""/>
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''Example v'': Here the <<.wlink ParametersWidget>> widget is used in addition to other parameter declarations, because later parameters depend on the value of earlier parameters. Positional values are assigned sequentially.
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<$macrocall $name=".example" n="5" eg="""\procedure myproc(age: 22)
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<$parameters acceptable-age={{{ [<age>divide[2]add[7]] }}} >
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If you're <<age>>, you can date a <<acceptable-age>>-year-old and it's not weird.
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</$parameters>
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\end
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<<myproc>>
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<<myproc 30>>
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<<myproc 35 70>>
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""" />
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