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* Docs: Conditional Shortcut Syntax corrections * Update Conditional Shortcut Syntax.tid Add a link to Filter Expression tiddler
63 lines
2.0 KiB
Plaintext
63 lines
2.0 KiB
Plaintext
created: 20230901122740573
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modified: 20230901123102263
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tags: WikiText
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title: Conditional Shortcut Syntax
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type: text/vnd.tiddlywiki
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<<.from-version "5.3.2">> The conditional shortcut syntax provides a convenient way to express if-then-else logic within WikiText. It evaluates a [[filter expression|Filter Expression]] and considers the condition to be true if there is at least one result (regardless of the value of that result).
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Within an "if" or "elseif" clause, the variable `condition` contains the value of the first result of evaluating the filter condition.
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A simple example:
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<$macrocall $name='wikitext-example-without-html'
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src='<% if [{$:/info/url/protocol}match[file:]] %>
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Loaded from a file URI
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<% else %>
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Not loaded from a file URI
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<% endif %>
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'/>
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One or more `<% elseif %>` clauses may be included before the `<% else %>` clause:
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<$macrocall $name='wikitext-example-without-html'
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src='<% if [{$:/info/url/protocol}match[file:]] %>
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Loaded from a file URI
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<% elseif [{$:/info/url/protocol}match[https:]] %>
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Loaded from an HTTPS URI
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<% elseif [{$:/info/url/protocol}match[http:]] %>
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Loaded from an HTTP URI
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<% else %>
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Loaded from an unknown protocol
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<% endif %>
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'/>
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The conditional shortcut syntax can be nested:
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<$macrocall $name='wikitext-example-without-html'
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src='\procedure test(animal)
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<% if [<animal>match[Elephant]] %>
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It is an elephant
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<% else %>
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<% if [<animal>match[Giraffe]] %>
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It is a giraffe
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<% else %>
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It is completely unknown
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<% endif %>
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<% endif %>
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\end
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<<test "Giraffe">>
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<<test "Elephant">>
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<<test "Antelope">>
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'/>
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Notes:
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* Clauses are parsed in inline mode by default. Force block mode parsing by following the opening `<% if %>`, `<% elseif %>` or `<% else %>` with two line breaks
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* Widgets and HTML elements must be within a single conditional clause; it is not possible to start an element in one conditional clause and end it in another
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* The conditional shortcut syntax cannot contain pragmas such as procedure definitions
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