Template:Error

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{{#ifeq:error |doc

    | 

{{#ifeq:show |show

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        }}{{#if: |
         |   {{#ifexist:Template:Error
                  | [[Category:{{#switch:Template |Template=Template |Module=Module |User=User |#default=Wikipedia}} documentation pages]]
                  |
                 }}
        }}
    | 
   }}

This meta template returns a state of error (recognized as such by a wiki parser function), and optionally an error-message text in red (visible for the user). It is used by other templates to signal an error, for example invalid input, which can then either be displayed to the editor or caught and handled by other templates.

Usage

• {{error|An exemplary error}} →
• {{error|message=An exemplary error}} →
• Compare, used in a Parser Function: {{#expr:Foo}} → {{#expr:Foo}}
• {{#iferror:{{error|Foo}} | {{y}} | {{n}} }} → {{#iferror: | Y | Template:N }}

Tag option

The tag to contain the error message can be given through the tag parameter, but it will only accept span, div, p, and strong, since those are the only tags recognized by the {{#if:|}}{{{{

 #switch: iferror
 | expr    | if      | ifeq    | iferror | ifexpr
 | ifexist | rel2abs | switch  | time
 | titleparts = #iferror
 | lc      | uc      | lcfirst | ucfirst | urlencode | anchorencode
 | ns = iferror
 | localurl   | localurle  | fullurl
 | fullurle = iferror
 | language = #iferror
 | pagesincategory
 | pagesincat = iferror
 | section | section-x | section-h | lst | lstx | lsth = #iferror
 | #default  = iferror

}}{{

 #if: 
 | Template:Colon

}}{{

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 | {{
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 }}|{{{3}}}

}}{{

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 | {{
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 }}|{{{4}}}

}}{{

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 | {{
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}}}}{{#if:|}} parser function. It defaults to strong, the tag generated e.g. by {{#if:|}}{{{{

 #switch: expr
 | expr    | if      | ifeq    | iferror | ifexpr
 | ifexist | rel2abs | switch  | time
 | titleparts = #expr
 | lc      | uc      | lcfirst | ucfirst | urlencode | anchorencode
 | ns = expr
 | localurl   | localurle  | fullurl
 | fullurle = expr
 | language = #expr
 | pagesincategory
 | pagesincat = expr
 | section | section-x | section-h | lst | lstx | lsth = #expr
 | #default  = expr

}}{{

 #if: 
 | Template:Colon

}}{{

 #if: 
 | {{
   #ifeq:  | 
   | Template:Colon|
 }}|{{{3}}}

}}{{

 #if: 
 | {{
   #ifeq:  |
   | Template:Colon|
 }}{{
   #ifeq:  |
   | |
 }}|{{{4}}}

}}{{

 #if: 
 | {{
   #ifeq:  |
   | Template:Colon|
 }}{{
   #ifeq:  |
   | |
 }}{{
   #ifeq:  |
   | |
 }}|{{{5}}}

}}}}{{#if:|}}. To prevent strong message, use one of the other tags, e.g. tag=span.

• ABC {{error|An exemplary error demo no tag (default)}} XYZ → ABC XYZ
• ABC {{error|An exemplary error demo span|tag=span}} XYZ → ABC XYZ
• ABC {{error|An exemplary error demo div|tag=div}} XYZ → ABC XYZ
• ABC {{error|An exemplary error demo p|tag=p}} XYZ → ABC XYZ
• ABC {{error|An exemplary error demo strong|tag=strong}} XYZ → ABC XYZ

TemplateData

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}}|no|P|p}}arameter usage report] for {{#if:Error|Template:Error|Template:Error}}{{#ifeq:{{safesubst:#switch: y

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|¬        = no
|yes
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|#default=[2]{{#ifeq:{{safesubst:#switch: y
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|         = no
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TemplateData for Error

{{#switch:

 {{#if:
 | {{{demospace}}}    
 | {{#ifeq:Template|Template
   | template
   | other
   }}
 }}

| template = {{#if:{{#ifeq:Error|sandbox|1}}{{#ifeq:Error|doc|1}}||

}} | other | #default = }}

The template returns a state of error (recognized as such by a wiki parser function), and optionally an error-message text in red (visible for the user)

Template parameters

Parameter		Description	Type	Status
Message	1 message	Error message text in red	String	suggested
Tag	tag	The tag to contain the error message; will only accept span, div, p, and strong, since those are the only tags recognized by the #iferror parser function. It defaults to strong, the tag generated e.g. by #expre Suggested values span div p strong Default strong	String	optional

See also

• {{Error-small}}
• {{Formatting error}}
• #iferror: parser function

{{#if:{{#ifeq:Error|sandbox|1}}{{#ifeq:Error|doc|1}}|| }}

The above documentation is transcluded from Template:Error/doc. (edit | history)
Editors can experiment in this template's sandbox (create | mirror) and testcases (create) pages.
Add categories to the /doc subpage. Subpages of this template.