Help:Template: Difference between revisions

Revision as of 19:07, 7 July 2024

Revision as of 04:03, 8 July 2024

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* {{anchor|Equals}}An unnamed parameter (positional parameter) value cannot contain an ordinary equals sign, as this would be interpreted in the parameter specification as a named parameter (with the equals sign separating the name from its value).{{efn|This does not apply if the equals sign comes within another template call or other item which the parser handles separately.}}

** To specify an unnamed parameter including an equals sign (for example in a [[URL]] with [[name–value pair]]s), replace the equals sign with the [[mw:Help:Magic words#Other|magic word]] {{tlx|{{=}}}}, which expands to an equals sign that will not be interpreted.

** Another method is to explicitly specifyreplace the positionalunnamed parameter specifications with named parameters. Thespecifications—unnamed parameters are equivalent to named parameters where the first unnamed parameter is named "1" and so on. To call template {{tl|done}} with <code>a=b</code> as the literal value for the first parameter, type either <code><nowiki>{{done|a{{=}}b}}</nowiki></code> or <code><nowiki>{{done|1=a=b}}</nowiki></code>.

* Similarly, it is not possible to use an ordinary pipe character <code>&#124;</code> in a template parameter specification, as it would be interpreted as separating one parameter specification from another.{{efn|Again, this does not apply if it comes within another separately parsed item, such as a piped wikilink.}} This problem can similarly be solved by using the magic word {{tlx|!}} in place of the pipe, or—if the pipe is not intended to be parsed at a higher level—using the [[List of XML and HTML character entity references|HTML entity]] <code>&amp;#124;</code>. Alternatively, for embedding [[Help:Table|wikitables]] in templates, you may use {{tlx|Wikitable}} to avoid excessive {{tlx|!}}.

* Remember that whitespace characters (spaces, tabs, carriage returns, and line feeds) are not automatically stripped from the start and end of unnamed parameters, unlike with named parameters. Including such characters (or any other non-visible characters in any parameters) may in some cases affect the template's behavior in unexpected ways. (Template designers can use {{tl|Trim}} to remove unwanted whitespace in unnamed parameters).