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80 lines
1.7 KiB
Plaintext
80 lines
1.7 KiB
Plaintext
caption: Variables
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created: 20141002141231992
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modified: 20150117152625000
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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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\define tags() {{!!tags}}
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[[Variables]] contain values. They are available within the scope of the [[widget|Widgets]] in which they are defined, as well as all child widgets in the widget tree.
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!!Defining Variables
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Variables are defined by...
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; [[Macros|Macros in WikiText]]
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: in fact, variables are macro shorthands (see example below)
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; SetWidget
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: sets a variable to a value
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; ListWidget
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: sets list-item and iterator variabes
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; TiddlyWiki
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: in the core and core templates
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!!Using Variables
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Variables are used...
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; via shorthand
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:`<<variableName>>`
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; via variable substitution within [[macros|Macros]]
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:`$(variableName)$`
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; as parameters to [[filter steps|Filters]]
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: `[operator<variableName>]`
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; in [[widgets|Widgets]]
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: internally, or as widget attributes
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: `<$edit tiddler=<<currentTiddler>>/>`
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!! Examples
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''defining a variable via SetWidget''
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```
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<$set name=foo value=bar>
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<<foo>>
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</$set>
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```
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<<<
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<$set name=foo value=bar>
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<<foo>>
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</$set>
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<<<
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''a variable is a macro''
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Below, the `\define` pragma at the beginning of a tiddler [[defines the macro|Macros in WikiText]] `<<tags>>`, valid in the scope of the CurrentTiddler, returning the value of the standard `tags` field.
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```
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\define tags() {{!!tags}}
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<<tags>>
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```
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<<<
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<<tags>>
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<<<
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''using a filter variable to get all incoming links''
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Using the <<olink backlinks>> [[filter operator|Filter Operators]] to get all tiddlers linking to this one...
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```
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<<list-links filter:"[<currentTiddler>backlinks[]]">>
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```
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<<<
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<<list-links filter:"[<currentTiddler>backlinks[]]">>
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<<<
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