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38 lines
1.7 KiB
Plaintext
38 lines
1.7 KiB
Plaintext
caption: Variables
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created: 20141002141231992
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modified: 20220930195709700
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tags: WikiText
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title: Variables in WikiText
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type: text/vnd.tiddlywiki
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See also the [[introduction to the concept of variables|Variables]].
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To transclude the value of a variable, use the [[macro call syntax|Macro Calls]] or the <<.wlink TranscludeWidget>> widget with the `$variable` attribute.
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A [[macro|Macros]] snippet can contain `$(name)$` as a [[placeholder|Macro Definitions in WikiText]] for which the value of the variable of that name will be substituted.
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A variable's value can be used as a [[filter parameter|Filter Parameter]], or as a [[widget attribute|Widgets in WikiText]]. The latter supports macro parameters.
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!! Example: defining a variable
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<$macrocall $name=".example" n="1"
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eg="""<$set name=animal value=zebra>
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<<animal>>
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</$set>"""/>
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!! Example: defining a macro
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The `\define` pragma below [[defines a macro|Macro Definitions]] called <<.var tags-of-current-tiddler>>. The macro returns the value of the tiddler's <<.field tags>> field, and can be accessed from anywhere else in the same tiddler (or in any tiddler that [[imports|ImportVariablesWidget]] it).
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<$importvariables filter="$:/editions/tw5.com/macro-examples/tags-of-current-tiddler">
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<$codeblock code={{$:/editions/tw5.com/macro-examples/tags-of-current-tiddler}}/>
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<$macrocall $name=".example" n="2" eg="""The tags are: <<tags-of-current-tiddler>>"""/>
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</$importvariables>
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!! Example: using a variable as a filter parameter
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This example uses the <<.olink backlinks>> [[operator|Filter Operators]] to list all tiddlers that link to this one.
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<$macrocall $name=".example" n="3" eg="""<<list-links filter:"[<currentTiddler>backlinks[]]">>"""/>
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