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.
A filter is a concise notation for selecting a particular set of tiddlers, known as its output. Whenever TiddlyWiki encounters a filter, it calculates the output. Further work can then be done with just those tiddlers, such as counting or listing them.
The following example passes a filter to the list-links macro. It displays a list of all tiddlers using the tag "Filters":
<<list-links "[tag[Filters]]">>That renders as:
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.
Find out more:
- Advanced Search – has a Filter tab that makes it easy to experiment with filters.
- Filtered Transclusions – If you want to use filter results in your text