mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-12-27 02:20:28 +00:00
24 lines
1.7 KiB
Plaintext
24 lines
1.7 KiB
Plaintext
created: 20141002133113496
|
|
modified: 20150221215644000
|
|
tags: Concepts Reference
|
|
title: Variables
|
|
type: text/vnd.tiddlywiki
|
|
|
|
A <<.def variable>> is a snippet of text that can be accessed by name within a particular branch of the [[widget tree|Widgets]]. The snippet is known as the variable's <<.def value>>.
|
|
|
|
A new variable is defined using a <<.wlink SetWidget>> widget, and is then available to any of the children of that widget, including transcluded content. A <<.wid set>> widget can reuse an existing name, thus binding a different snippet to that name for the duration of the widget's children.
|
|
|
|
The <<.wlink ListWidget>> widget also sets a particular variable (<<.var currentTiddler>> by default) to each listed title in turn.
|
|
|
|
For an overview of how to use variables, see [[Variables in WikiText]].
|
|
|
|
Despite the term <<.word variable>>, each snippet is a constant string. The apparent variability is actually the result of the presence of multiple variables with the same name in different parts of the widget tree.
|
|
|
|
[[Macros]] are a special form of variable whose value can contain placeholders that get filled in with parameters whenever the macro is used.
|
|
|
|
By themselves, the snippets are <<.em not>> parsed as WikiText. However, a variable reference will transclude a snippet into a context where ~WikiText parsing <<.em may>> be occurring. Within a snippet, the only markup detected is `$name$` for a macro parameter transclusion and `$(name)$` for a variable transclusion.
|
|
|
|
The <<.mlink dumpvariables>> macro lists all variables (including macros) that are available at that position in the widget tree.
|
|
|
|
~TiddlyWiki's core has [[several variables|Core Variables]] built in.
|