This Lua module is used in system messages, and onapproximately 22,100,000 pages, or roughly 35% of all pages. Changes to it can cause immediate changes to the Wikipedia user interface. To avoid major disruption and server load, any changes should be tested in the module's/sandbox or/testcases subpages, or in your ownmodule sandbox. The tested changes can be added to this page in a single edit. Please discuss changes on thetalk page before implementing them.

This module can only be edited byadministrators because it istranscluded onto one or morecascade-protected pages.

This module depends on the following other modules: Module:If preview (sandbox)

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 at the end or called directly from a module.

To sort entries into a tracking category by parameter, use:

• {{#invoke:Check for unknown parameters|check|unknown=[[Category:Some tracking category|_VALUE_]]|arg1|arg2|arg3|argN}}

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

• {{#invoke:Check for unknown parameters|check|unknown=[[Category:Some tracking category|_VALUE_]]|preview=unknown parameter "_VALUE_"|arg1|arg2|...|argN}}

For an explicit red error message, use:

• {{#invoke:Check for unknown parameters|check|unknown=<span>Sorry, I don't recognize _VALUE_</span>|arg1|arg2|...|argN}}

To use Lua patterns, use:

• {{#invoke:Check for unknown parameters|check|unknown=[[Category:Some tracking category|_VALUE_]]|preview=unknown parameter "_VALUE_"|arg1|arg2|...|argN|regexp1=header[%d]+|regexp2=date[1-9]}}

To call from a module, use:

localcheckForUnknownParameters=require("Module:Check for unknown parameters")localresult=checkForUnknownParameters._check(validArgs,args)

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

• arg1,arg2, ...,argN, are the known parameters.
• Unnamed (positional) parameters can be added too:|1|2|arg1|arg2|....
• Lua patterns (similar toregular expressions) usage with parameters is also supported (such as:|regexp1=header[%d]+,|regexp2=date[1-9],|regexp3=data[%d]+[abc]?). This is useful when there are many known parameters which use a systematic pattern.
• |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.
• |preview= – the text to be displayed when in preview mode and an unknown parameter is used.
• The_VALUE_ 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.
• |ignoreblank=1 – by default, the module makes no distinction between a defined-but-blank parameter and a non-blank parameter. That is, both unlisted|foo=x and|foo= are reported. To only track non-blank parameters use|ignoreblank=1.
• |showblankpositional=1 – by default, the module ignores blank positional parameters. That is, an unlisted|2= is ignored. Toinclude blank positional parameters in the tracking use|showblankpositional=1.

{{Infobox| above={{{name|}}}| label1= Height| data1={{{height|}}}| label2= Weight| data2={{{weight|}}}| label3= Website| data3={{{website|}}}}}<!--  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}}

See the end ofModule:Rugby box for a simple example orModule:Infobox3cols orModule:Flag for more complicated examples.

• Category:Unknown parameters (301) (category page can have header{{Unknown parameters category}})
• 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
• Module:TemplatePar – similar function (originally from dewiki)
• Template:Parameters andModule: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

• Module documentation pages