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{{Lua|Module:If preview|noprotcat=yes}}

This'''Module:Check for unknown parameters''' is used to check for uses of unknown parameters in a template or module. It may be appended to a template toat checkthe forend usesor ofcalled unknowndirectly parametersfrom a module.

== Usage ==

=== From a template ===

<pre>

or toTo sort the entries ininto thea tracking category by parameter, use:

{{#invoke:check for unknown parameters|check

* {{mlx|Check for unknown parameters|check|unknown{{=}}<nowiki>[</nowiki>[Category:Some tracking category|_VALUE_]]|arg1|arg2|arg3|argN}}

|arg1|arg2|...|argN}}

</pre>

or to sort the entries in the tracking category by parameter

<pre>

{{#invoke:check for unknown parameters|check

|unknown=[[Category:Some tracking category|_VALUE_]]

|arg1|arg2|...|argN}}

</pre>

or for an explicit red error message

<pre>

{{#invoke:check for unknown parameters|check

|unknown=<span class=error>Sorry, I don't recognize _VALUE_</span>

|arg1|arg2|...|argN}}

</pre>

or to use hidden error messages which can be viewed in the HTML source

<pre>

{{#invoke:check for unknown parameters|check

|unknown=<span style="display:none">HIDDEN ERROR: Usage of "_VALUE_" is not recognized</span>

|arg1|arg2|...|argN}}

</pre>

Here, <code>arg1</code>, <code>arg2</code>, ..., <code>argN</code>, are the known parameters. Any parameter which is used, but not on this list, will cause the module to return whatever is passed with the <code>unknown</code> parameter. The <code>_VALUE_</code> keyword, if used, will be changed to the name of the parameter. This is useful for either sorting the entries in a tracking category, or for provide more explicit information.

To sort the entries into a tracking category by parameter with a preview error message, use:

By default, the module makes no distinction between a defined-but-blank parameter and a non-blank parameter. To only track non-blank parameters use {{para|ignoreblank|1}}.

* {{mlx|Check for unknown parameters|check|unknown{{=}}<nowiki>[</nowiki>[Category:Some tracking category|_VALUE_]]|preview{{=}}unknown parameter "_VALUE_"|arg1|arg2|...|argN}}

or forFor an explicit red error message, use:

* {{mlx|Check for unknown parameters|check|unknown{{=<}}&lt;span class{{=}}"error">Sorry, I don't recognize _VALUE_<&lt;/span>|arg1|arg2|...|argN}}

To use Lua patterns, use:

* {{mlx|Check for unknown parameters|check|unknown{{=}}<nowiki>[</nowiki>[Category:Some tracking category|_VALUE_]]|preview{{=}}unknown parameter "_VALUE_"|arg1|arg2|...|argN|regexp1{{=}}header[%d]+|regexp2{{=}}date[1-9]}}

===From a module===

To call from a module, use:

<syntaxhighlight lang="lua">

local checkForUnknownParameters = require("Module:Check for unknown parameters")

local result = checkForUnknownParameters._check(validArgs, args)

</syntaxhighlight>

Where the first set of args are the module args below and the second set of args are the parameters that are checked.

== Parameters ==

* <code>arg1</code>, <code>arg2</code>, ..., <code>argN</code>, are the known parameters.

* Unnamed (positional) parameters can be added too: <code>|1|2|arg1|arg2|...</code>.

* [[:mw:Extension:Scribunto/Lua reference manual#Patterns|Lua patterns]] (similar to [[regular expression]]s) usage with parameters is also supported (such as: {{para|regexp1|header[%d]+}}, {{para|regexp2|date[1-9]}}, {{para|regexp3|data[%d]+[abc]?}}). This is useful when there are many known parameters which use a systematic pattern.

* {{para|unknown}} – what happens when an unknown parameter is used. Typically use either a tracking category to place pages that use unknown parameters, or an error.

* {{para|preview}} – the text to be displayed when in preview mode and an unknown parameter is used.

Here, <code>arg1</code>, <code>arg2</code>, ..., <code>argN</code>, are the known parameters. Any parameter which is used, but not on this list, will cause the module to return whatever is passed with the <code>unknown</code> parameter. * The <code>_VALUE_</code> keyword, if used, will be changed to the name of the parameter. This is useful for either sorting the entries in a tracking category, or for provide more explicit information.

By* {{para|ignoreblank|1}} – by default, the module makes no distinction between a defined-but-blank parameter and a non-blank parameter. That is, both unlisted {{Para|foo|x}} and {{Para|foo}} are reported. To only track non-blank parameters use {{para|ignoreblank|1}}.

* {{para|showblankpositional|1}} – by default, the module ignores blank positional parameters. That is, an unlisted {{para|2}} is ignored. To {{em|include}} blank positional parameters in the tracking use {{para|showblankpositional|1}}.

== Example ==

<syntaxhighlight lang="wikitext">

<pre>

{{Infobox

| above = {{{name|}}}

Line 48 ⟶ 55:

end infobox, start tracking

-->{{#invoke:Check for unknown parameters|check

| unknown = {{Main other|[[Category:Some tracking category|_VALUE_]]}}

| preview = unknown parameter "_VALUE_" | height | name | website | weight

| name

| height | weight

| website

}}

</syntaxhighlight>

</pre>

==Call from within Lua code==

==Templates invoking this module==

See the end of [[Module:Rugby box]] for a simple example or [[Module:Infobox3cols]] or [[Module:Flag]] for more complicated examples.

* [[Template:Country topics]]

* [[Template:Infobox academic division]]

* [[Template:Infobox dam]]

* [[Template:Infobox event]]

* [[Template:Infobox language family]]

* [[Template:Infobox Minor League Baseball]]

* [[Template:Infobox NFL coach]]

* [[Template:Infobox Paris metro]]

* [[Template:Infobox political party]]

* [[Template:Infobox public transit]]

* [[Template:Infobox settlement]]

* [[Template:Multiple issues]]

* [[Template:Year box]]

==See also==

* {{Clc|Unknown parameters}} (category page can have header {{tl|Unknown parameters category}})

* [[:module:TemplatePar]] (originally from dewiki)

* [[Module:Params]] – for complex operations involving parameters

* [[Template:Checks for unknown parameters]] – adds documentation to templates using this module

* [[Module:Check for deprecated parameters]] – similar module that checks for deprecated parameters

* [[Module:Check for clobbered parameters]] – module that checks for conflicting parameters

* [[:moduleModule:TemplatePar]] – similar function (originally from dewiki)

* [[Template:Parameters]] and [[Module:Parameters]] – generates a list of parameter names for a given template

* [[Project:TemplateData]] based template parameter validation

* [[Module:Parameter validation]] checks a lot more

* [[User:Bamyers99/TemplateParametersTool]] - A tool for checking usage of template parameters

<includeonly>{{#ifeq:{{SUBPAGENAME}}|sandboxSandbox other||

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|unknown=[[Category:SomeModules that add a tracking category|_VALUE_]]

[[Category:Template metamodules]]

}}</includeonly>

<noinclude>

[[Category:Module documentation pages]]

</noinclude>