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Code Issues Releases Wiki Activity

Add docs on achieving unique tag macro dropdowns inside list widget (#7639)

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Mateusz Wilczek 2023-07-31 13:09:46 +02:00 committed by GitHub
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4
editions/tw5.com/tiddlers/macros/TagMacro.tid
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@ -1,12 +1,14 @@
caption: tag
created: 20141206130540337
modified: 20150221224326000
modified: 20230725201240201
tags: Macros [[Core Macros]]
title: tag Macro
type: text/vnd.tiddlywiki
The <<.def tag>> [[macro|Macros]] generates a tag pill for a specified tag. Clicking the tag pill opens a dropdown. This can be compared to the [[tag-pill Macro]] which also features other parameters.
<<.tip """If a [[list widget|ListWidget]] generates multiple tag macros for the same tag, clicking on one of them will open dropdowns on all of them. The simplest way to prevent this is to add the `counter="transclusion"` attribute to the list widget. See the examples below for more details.""">>
!! Parameters
;tag

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editions/tw5.com/tiddlers/macros/examples/tag.tid
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@ -1,8 +1,29 @@
created: 20150221211317000
modified: 20150221224519000
modified: 20230725203751870
tags: [[tag Macro]] [[Macro Examples]]
title: tag Macro (Examples)
type: text/vnd.tiddlywiki
<$macrocall $name=".example" n="1" eg="""<<tag>>"""/>
<$macrocall $name=".example" n="2" eg="""<<tag Concepts>>"""/>
If a [[list widget|ListWidget]] generates multiple tag macros for the same tag, clicking any of them opens dropdowns on all of them, as in the example below. This is usually unwanted.
<$macrocall $name=".example" n="3" eg="""<$list filter="[tag[HelloThere]]">
* <$link/> is tagged with: <$list filter="[<currentTiddler>tags[]]"> <<tag>> </$list>
</$list>"""/>
Adding the `counter="transclusion"` attribute to the list widget that generates multiple identical tag macros causes each of them to be identified as a unique one. Clicking on any of them opens only a single dropdown.
<$macrocall $name=".example" n="4" eg="""<$list filter="[tag[HelloThere]]" counter="transclusion">
* <$link/> is tagged with: <$list filter="[<currentTiddler>tags[]]"> <<tag>> </$list>
</$list>"""/>
A slightly more performant option is to use the `variable="transclusion"` attribute in the list widget. In this case, the variable `<<transclusion>>` has to be used inside the list widget instead of the `<<currentTiddler>>` .
<$macrocall $name=".example" n="5" eg="""<$list filter="[tag[HelloThere]]" variable="transclusion">
* <$link to=<<transclusion>>/> is tagged with: <$list filter="[<transclusion>tags[]]"> <<tag>> </$list>
</$list>"""/>

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editions/tw5.com/tiddlers/widgets/ListWidget.tid
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@ -1,6 +1,6 @@
caption: list
created: 20131024141900000
modified: 20220718120325494
modified: 20230725203601441
tags: Widgets Lists
title: ListWidget
type: text/vnd.tiddlywiki
@ -119,6 +119,8 @@ Displays as:
Note that using the `counter` attribute can reduce performance when working with list items that dynamically reorder or update themselves. The best advice is only to use it when it is really necessary: to obtain a numeric index, or to detect the first or last entries in the list.
Setting `counter="transclusion"` is a handy way to make child elements for each list element be identified as unique. A common use case are multiple [[tag macros|tag Macro]] for the same tag generated by a list widget. Refer to [[tag macro examples|tag Macro (Examples)]] for more details.
!! Edit mode
The `<$list>` widget can optionally render draft tiddlers through a different template to handle editing, see DraftMechanism.