Template:If/doc

This is a documentation subpage for Template:If (see that page for the template itself).
It contains usage information, categories and other content that is not part of the original template page.

With this template the parser functions of the ParserFunctions collection with names starting with "#if" can be used in a way such that they do not strip spaces and newlines from the "then" and "else" part. Spaces still do not affect the outcome of the condition.

Usage

• {{if||x| p | q }} gives " p "
• {{if|expr|2<3| p | q }} gives " p "
• {{if|eq| u |u| p | q }} gives " p "
• {{if|exist| Help:Link | p | q }} gives " q "
• {{if|error|{{#expr:x}}| p | q }} gives " p "

Compare:

• {{#if:x| p | q }} gives "p"
• {{#ifexpr:2<3| p | q }} gives "p"
• {{#ifeq: u |u| p | q }} gives "p"
• {{#ifexist: Help:Link | p | q }} gives "q"
• {{#iferror:{{#expr:x}}| p | q }} gives "p"

For full substitution, use e.g. {{subst:if|expr|2<3| p | q |subst=subst:}}. If the condition contains a parser function or template etc., that should be substituted too. Optionally the "then" or "else" part can also be substituted.

See also

• m:Template:if (backlinks, edit)