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[edit] Template documentation

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).

Usage

• {{error|An exemplary error}} → An exemplary error
• Compare, used in a Parser Function: {{#expr:Foo}} → Expression error: Unrecognised word "foo"
• {{#iferror:{{error|Foo}} | {{y}} | {{n}} }} → Template:Y

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 #iferror parser function. It defaults to strong, the tag generated e.g. by #expre. 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 An exemplary error demo no tag (default) XYZ
• ABC {{error|An exemplary error demo span|tag=span}} XYZ → ABC An exemplary error demo span XYZ
• ABC {{error|An exemplary error demo div|tag=div}} XYZ → ABC
  An exemplary error demo div
  XYZ
• ABC {{error|An exemplary error demo p|tag=p}} XYZ → ABC

  An exemplary error demo p

  XYZ
• ABC {{error|An exemplary error demo strong|tag=strong}} XYZ → ABC An exemplary error demo strong XYZ

See also

• Help:Parser function
• mw:Help:Extension:ParserFunctions##iferror: