الگو:CheckElement
ظاهر
Template that returns an error message if the first argument is not valid for use with other helper templates.
Usage
[ویرایش]When using a string that is not a valid element name or symbol or "x" or "element", an error message is returned, like so:
{{CheckElement|C}}
will return ""{{CheckElement|Carbon}}
will return ""{{CheckElement|Blablabla}}
will return "unknown element Blablabla."
The "link=yes" argument is also supported; if the element name or symbol has no associated link, an error message is returned, like so:
{{CheckElement|link=yes|C}}
will return ""{{CheckElement|link=yes|Carbon}}
will return ""{{CheckElement|link=yes|X}}
will return "The generic element 'X' does not have a page to link to."
When using a common name for an element that goes against the Wikipedia style guide for element names, a warning message will be returned. There are currently three such names:
{{CheckElement|Aluminum}}
will return "Aluminum is not a valid way to spell aluminium."{{CheckElement|Sulphur}}
will return "Sulphur is not a valid way to spell sulfur."{{CheckElement|Cesium}}
will return "Cesium is not a valid way to spell caesium."
This template can be used in other templates to check for error before calling other templates that require a valid element or symbol like so:
{{#ifexpr:{{CheckElement|{{{element argument}}}|link={{{link|}}} }} | {{Element2|{{{element argument}}} }} is the best element in the whole world | Bad input for element name or symbol }}