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Code Issues Releases Wiki Activity

Add notes about subfilter expressions (#7667)

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yaisog 2023-08-08 10:52:39 +02:00 committed by GitHub
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24
editions/tw5.com/tiddlers/widgets/ActionListopsWidget.tid
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@ -1,6 +1,6 @@
caption: action-listops
created: 20141025120850184
modified: 20230301183438774
modified: 20230805103548113
myfield:
tags: ActionWidgets Widgets
title: ActionListopsWidget
@ -22,6 +22,28 @@ The ''action-listops'' widget is invisible. Any content within it is ignored.
|$subfilter |An optional subfilter expression, which takes the list being manipulated as input, and saves the modified list back to the field/index being manipulated |
|$tags |An optional subfilter expression, which takes the <<.field tags>> field of the target tiddler as input, and saves the modified list of tags back to the <<.field tags>> field |
!! Note on subfilter expressions
If the manipulation depends on the current contents of the list, e.g. when using the <<.olink toggle>> operator to toggle the presence of an element, the [[Filter Run]] would be prefixed with the `+` / `:and` [[filter run prefix|Filter Expression]] so that it properly receives the list as input.
```
<$action-listops $subfilter="+[toggle[List Item]]"/>
```
The above widget will toggle the presence of the element <<.value "List Item">> in the field <<.field list>> of the current tiddler, removing or adding the element as necessary.
Similarly, if an element is to always be removed when it is present, the `-` / `:except` [[filter run prefix|Filter Expression]] can be used. Both of the following yield the same result:
```
<$action-listops $subfilter="-[[List Item]]"/>
<$action-listops $subfilter="+[remove[List Item]]"/>
```
Without any prefixes, the filter run output is simply [[dominantly appended|Dominant Append]] to the list.
See also the [[Examples|ActionListopsWidget (Examples)]].
!! Using $filter or $subfilter
Standalone use of the `$subfilter` attribute can be replaced by using a (more complicated) `$filter` attribute value.

13
editions/tw5.com/tiddlers/widgets/examples/ActionListopsWidget (Examples).tid
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@ -1,8 +1,9 @@
created: 20230301174431218
list: efg hlm pqr
modified: 20230301174431218
modified: 20230805103601224
myfield:
revision: 0
tags: ActionListopsWidget
title: ActionListopsWidget (Examples)
type: text/vnd.tiddlywiki
@ -47,6 +48,16 @@ Unmangle List
</$list>"""/>
---
The following example toggles the tag <<.value Examples>> for the current tiddler.
<$macrocall $name='wikitext-example-without-html'
src="""<$button>
<$action-listops $tags="+[toggle[Examples]]"/>
Toggle 'Examples' tag
</$button>
"""/>
---
In this example we shall append a few tags to the 'tags' field of this tiddler (the default). We shall then remove some of the appended tags.