Template:Error

The following documentation is located at Template:Error/doc. [<Edit> Template:Error/doc]
[⧼Purge⧽ Template:Error]

The {{error}} OEIS Wiki metatemplate returns a state of error (with HTML attribute class="error" given to one of four choices of HTML tags, recognized as such by the wiki parser function extension #iferror), and optionally a user-friendly error message text (in by default).

Usage

{{#iferror: warning | {{no}} An error! | {{yes}} Not an error! }}	Y Not an error!
{{#iferror: error | {{no}} An error! | {{yes}} Not an error! }}	Y Not an error!
{{warning}}	This is a warning!
{{#iferror: {{warning}} | {{no}} An error! | {{yes}} Not an error! }}	Y Not an error!
{{error}}
{{#iferror: {{error}} | {{no}} An error! | {{yes}} Not an error! }}	Y An error!
{{warning| A typical warning: You're lucky! }}	A typical warning: You're lucky!
{{#iferror: {{warning| A typical warning: You're lucky! }} | {{no}} An error! | {{yes}} Not an error! }}	Y Not an error!
{{error| A typical error: Too bad! }}
{{#iferror: {{error| A typical error: Too bad! }} | {{no}} An error! | {{yes}} Not an error! }}	Y An error!
With parser function: {{#expr: 9+3 }}	12
{{#iferror: {{#expr: 9+3 }} | {{no}} An error! | {{yes}} Not an error! }}	Y Not an error!
With parser function: {{#expr: Foo }}
{{#iferror: {{#expr: Foo }} | {{no}} An error! | {{yes}} Not an error! }}	Y An error!

Tag option

The HTML tag to contain the error message can be given through the tag parameter, but it will only accept div, p, span, and strong, since those are the only tags recognized by the #iferror parser function. It defaults to strong, the tag generated by e.g. the #expr parser function. To prevent the use of the strong default tag, use one of the other tags, e.g. tag = span.

{{error|A typical error demo (default tag: strong)}}
{{error|An exemplary error demo (strong tag)|tag = strong}}
{{error|An exemplary error demo (span tag)|tag = span}}
{{error|An exemplary error demo (p tag)|tag = p}}
{{error|An exemplary error demo (div tag)|tag = div}}

Code

<noinclude>{{documentation}}</noinclude><includeonly><{{#switch: {{lc: {{{tag|}}} }}
| div = div
| p = p
| span = span
| #default = strong
}} class="error">{{{message|{{{1|An error occurred!}}}}}}</{{#switch: {{lc: {{{tag|}}} }}
| div = div
| p = p
| span = span
| #default = strong
}}></includeonly>

Code suggestion for {{if error}}

If we ever need a {{if error}} template, here's the code suggestion:

<noinclude>{{Documentation}}</noinclude><includeonly><!--
-->{{#if: {{#pos: {{{1|}}} | class{{=}}"error" }} 
| {{{2|}}} 
| {{{3|}}}
}}</includeonly>

Tests:

:{{#if: {{#pos: {{warning}} | class{{=}}"error" }} 
| {{yes}} Error! 
| {{no}} No error.
}}
:{{#if: {{#pos: {{error}} | class{{=}}"error" }} 
| {{yes}} Error! 
| {{no}} No error.
}}

yields

Y No error.

Y Error!

See also

• {{error}} to return an error message and a state of error (with HTML attribute class="error")
• {{if error}} to return different values depending on whether a state of error (with HTML attribute class="error") is given within its first argument (see Code suggestion for {{if error}})
• #iferror parser function extension (cf. MediaWiki external link below)

• {{warning}} to return a warning message and a state of warning (with HTML attribute class="warning")
• {{if warning}} to return different values depending on whether a state of warning (with HTML attribute class="warning") is given within its first argument (see Code suggestion for {{if warning}})
• There is no #ifwarning parser function extension, but the above suggested template may be implemented for that purpose.

External links

• Help:Parser function—Wikipedia.org.
• #iferror—MediaWiki.org.