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Jeremy Ruston
2025-03-11 12:49:40 +00:00
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commit efce6731e1
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editions/tw5.com/tiddlers/widgets/LetListWidget.tid
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@@ -6,13 +6,21 @@ caption: letlist
! Introduction
<<.from-version "5.3.7">> The <<.wid letlist>> widget allows multiple variables to be set in one operation, each to the list of results from evaluating a filter. It is similar to the <<.wlink LetWidget>> widget but assigns the complete list of results to the variable instead of just the first result.
<<.from-version "5.3.7">> The <<.wid letlist>> widget allows multiple variables to be set in one operation, each to the list of results from evaluating an attribute. It is similar to the <<.wlink LetWidget>> widget but assigns the complete list of results to a multi-valued variable instead of just the first result.
! Content and Attributes
The content of the <<.wid letlist>> widget is the scope for the value assigned to the variable.
|!Attribute |!Description |
|//{attributes}// |Each attribute name specifies a variable name. The attribute value is a filter whose results are is assigned to the variable |
|//{attributes}// |Each attribute name specifies a variable name. The attribute value is a list that is assigned to the variable |
The <<.wid letlist>> is primarily intended to be used with the filtered attribute syntax. This enables the result list of a filter to be assigned to a multi-valued variable:
```
<$letlist varname={{{ [all[tiddlers]sort[]] }}}>
<$text text={{{ [varlist[varname]] +[join[-]] }}}/>
</$letlist>
```
Attributes are evaluated in the order they are written. Attributes with the same name are allowed. Each time a duplicate attribute is encountered, it will replace the existing value set by the earlier duplicate.