Template:Ifnoerror then show

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This template tests whether the first unnamed parameter contains an error message and returns

• the value of the first parameter prefixed by the third parameter value, and suffixed by the fourth parameter value, if there is no error;
• the value of the second unnamed parameter, if given, or the first parameter value itself, if there is an error.

This is useful when the first parameter is an {{#invoke: }} of a Lua module that may return an error. Because it uses the {{#invoke: }} just once, it simplifies the coding of infoboxes, for example.

It can be used for adding tracking categories in templates, where showing the module's error message is undesirable.

Usage

{{#invoke:Infobox mapframe|auto}} called with improper coordinates

{{ifnoerror then show |{{#invoke:Infobox mapframe|auto|onByDefault=yes|coordinates=10, 30}} |ERROR|PREFIX|SUFFIX}} → ERROR

{{#invoke:Infobox mapframe|auto}} call that produces no errors

{{ifnoerror then show |{{#invoke:Infobox mapframe|auto|onByDefault=yes}} |ERROR|PREFIX|SUFFIX}} → PREFIX{{invoke:Infobox mapframe|...}}SUFFIX

See also

• {{Iferror then show}} – similar template with inverted logic

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