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Because "Introduction" is no longer used on Tiddlywiki.com, so the example is a bit confusing
58 lines
1.9 KiB
Plaintext
58 lines
1.9 KiB
Plaintext
title: SetWidget
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created: 201311151827
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modified: 20150220162217000
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tags: Widgets
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caption: set
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! Introduction
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The set variable widget assigns a value to a specified [[variable|Variables]]. The new value of the variable is available to the content within the set variable widget.
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! Content and Attributes
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The content of the `<$set>` widget is the scope for the value assigned to the variable.
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|!Attribute |!Description |
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|name |The name of the variable to assign (defaults to "currentTiddler") |
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|value |The value to assign to the variable if the filter is missing or not empty |
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|filter |An optional filter to be evaluated and assigned to the variable (see below) |
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|emptyValue |The value to assign to the variable if the filter is present and evaluates to an empty list (see below) |
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!! Simple Variable Assignment
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The simplest way of using set variable widget assigns a string to a variable. The following example assigns a literal string
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```
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<$set name="myVariable" value="Some text">
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<$text text=<<myVariable>>/>
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</$set>
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```
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Both the name and value attributes can be transcluded. For example:
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```
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<$set name=<<anotherVariable>> value={{template!!text}}>
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<$text text=<<myVariable>>/>
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</$set>
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```
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!! Conditional Variable Assignment
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This form of the set variable widget chooses one of two specified values according to whether a filter evaluates to an empty list. Here's an example that sets a variable according to whether the current tiddler is called "myMagicTitle":
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```
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<$set name="myVariable" filter="[all[current]field:title[myMagicTitle]]" value="It's magic" emptyValue="It's not magic">
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<$text text=<<myVariable>>/>
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</$set>
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```
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!! Filtered List Variable Assignment
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This form of the set variable widget evaluates the filter and assigns the result to the variable as a space-separated list (using double square brackets for titles containing spaces).
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```
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<$set name="myVariable" filter="[tag[HelloThere]]">
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<$text text=<<myVariable>>/>
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</$set>
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```
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