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28 lines
1.6 KiB
Plaintext
28 lines
1.6 KiB
Plaintext
caption: getvariable
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created: 20190330100101453
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modified: 20240219183835439
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op-input: a selection of variable names
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op-output: the values of each of the variables named in the input titles (or blank if the variable is not defined)
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op-parameter: <<.from-version "5.3.4">> defaults to: "text". optional: "value". Content type <<.param T>> of the varible content that should be returned
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op-purpose: select all values of variables named in the input titles
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tags: [[Filter Operators]] [[Special Operators]]
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title: getvariable Operator
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type: text/vnd.tiddlywiki
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<<.from-version "5.1.20">> The usual way to retrieve a variable value within a filter is with the angle brackets notation. For example, `[<currentTiddler>]` will retrieve the value of the variable called `currentTiddler`.
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The `getvariable` filter operator provides an alternative way to retrieve a variable. For example, `[[currentTiddler]getvariable[]]` is another way to retrieve the value of the variable `currentTiddler`.
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The advantage of `getvariable` is that it makes it possible to work with variables whose name is computed, and not known in advance. For example, `[<myvariable>getvariable[]]` gets the value of the variable whose name is given in the variable `myvariable`.
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''Content Type:'' <<.from-version "5.3.4">>
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The Prameter <<.param T>> by default is "text". Variables, that are defined as eg: `\function`s have two useful content types:
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* ''text'' ... contains the wikified text of the filter expression
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* ''value'' ... contains the definition string
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For any other variable type "text" and "value" are the same thing.
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<<.operator-examples "getvariable">>
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