Template:Ifnotempty: Difference between revisions

Revision as of 01:20, 31 December 2011

Documentation

With this template #if can be used in a way such that it does not strip spaces and newlines from the "then" and "else" part. For evaluating the condition spaces and newlines are stripped like with ParserFunctions.

Usage

{{ifnotempty|x| p | q }} gives " p "
{{ifnotempty|| p | q }} gives " q "

Compare:

{{#if:x| p | q }} gives "p"

Internal technical details

For evaluating the condition (determining non-emptiness of the first parameter) the template uses parser function #if, producing 1 if the condition is true, and 2 otherwise. The template with name equal to "P" followed by the index value produced (hence Template:P1 or Template:P2), is called with as parameters p and q. This produces either p or q, without trimming.

@@ Line 11: / Line 11: @@
 ==Internal technical details==
-For evaluating the condition the template uses the actual parser function; however, not directly with p and q, because this strips spaces and newlines from the result, but with index values 1 and 2. The result can be 1, 2. The template with the applicable name is called ([[Template:P1]] or  [[Template:P2]]), with as parameters p and q.
+For evaluating the condition (determining non-emptiness of the first parameter) the template uses parser function #if, producing 1 if the condition is true, and 2 otherwise. The template with name equal to "P" followed by the index value produced (hence [[Template:P1]] or [[Template:P2]]), is called with as parameters p and q. This produces either p or q, without trimming.
 ==See also==