29 lines
1.7 KiB
Plaintext
29 lines
1.7 KiB
Plaintext
created: 20130827080000000
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list: [[Introduction to filter notation]] [[Filter Syntax]]
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modified: 20230710074511095
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tags: Reference Concepts TableOfContents
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title: Filters
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type: text/vnd.tiddlywiki
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\define openAdvancedSearch()
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<$action-setfield $tiddler="$:/state/tab--1498284803" text="$:/core/ui/AdvancedSearch/Filter"/>
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<$action-setfield $tiddler="$:/temp/advancedsearch/input" text="[tag[Filters]]"/>
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<$action-setfield $tiddler="$:/temp/advancedsearch" text="[tag[Filters]]"/>
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\end
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You can think of TiddlyWiki as a database in which the records are tiddlers. A database typically provides a way of discovering which records match a given pattern, and in ~TiddlyWiki this is done with filters.
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A <<.def filter>> is a concise notation for selecting a particular [[set of tiddlers|Title Selection]], known as its <<.def "output">>. Whenever ~TiddlyWiki encounters a filter, it calculates the output. Further work can then be done with just those tiddlers, such as [[counting|CountWidget]] or [[listing|ListWidget]] them.
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The following example passes a filter to the <<.mlink list-links>> macro. It displays a list of all tiddlers using the <<.olink2 tag tag>> <<.word Filters>>:
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<<wikitext-example-without-html """<<list-links "[tag[Filters]]">>""" >>
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A filter output can change as tiddlers are added and deleted in the wiki. ~TiddlyWiki recalculates on the fly, automatically updating any filter-based counts or lists as well.
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''Find out more:''
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* <$linkcatcher message="tm-navigate" actions=<<openAdvancedSearch>> >[[Advanced Search|$:/AdvancedSearch]]</$linkcatcher> -- has a <<.advancedsearch-tab Filter>> tab that makes it easy to experiment with filters.
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* [[Filtered Transclusions|Transclusion in WikiText]] -- If you want to use filter results in your text
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