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https://github.com/Jermolene/TiddlyWiki5
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51 lines
1.4 KiB
Plaintext
51 lines
1.4 KiB
Plaintext
title: VarsWidget
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created: 20150426115958020
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modified: 20150426115958020
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tags: Widgets
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caption: vars
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! Introduction
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The ''vars'' widget allows multiple variables to be set in one operation. In some situations it can result in simpler code than using the more flexible SetWidget.
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! Content and Attributes
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The content of the `<$vars>` widget is the scope for the value assigned to the variable.
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|!Attribute |!Description |
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|//{attributes not starting with $}// |Each attribute name specifies a variable name. The attribute value is assigned to the variable |
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! Examples
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Consider a case where you need to set multiple variables.
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Using the `<$vars>` widget, this situation may be handled in the following way:
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```
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\define helloworld() Hello world!
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<$vars greeting="Hi" me={{!!title}} sentence=<<helloworld>>>
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<<greeting>>! I am <<me>> and I say: <<sentence>>
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</$vars>
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```
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In contrast, here is the same example using the `<$set>` widget:
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```
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<$set name="greeting" value="Hi" >
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<$set name="me" value={{!!title}} >
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<$set name="sentence" value=<<helloworld>> >
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<<greeting>>! I am <<me>> and I say: <<sentence>>
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</$set>
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</$set>
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</$set>
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```
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! Remarks
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It should be noted that this widget differs from the set widget in the following ways:
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* A fallback (also known as "emptyValue") cannot be specified
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* Filters cannot be used to produce a conditional variable assignement
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* Variable names must be literal strings
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