మూస:Conditional template call with newline/doc

This template calls template {{{2}}} with parameter {{{3}}} and adds a newline at the end, all under condition {{{1}}}. Successive calls should not be separated by a newline.

This templates has been used to avoid writing out the condition twice, once for the template call and once for the newline, but also Template:If can be used to preserve newlines.

Usage

Sample 1

Example using Template:2x, which simply repeats its argument twice, so {{2x|Pizza}} produces PizzaPizza. One can combine this with {{Conditional template call with newline}} in the following code

{{#tag:pre|{{Conditional template call with newline|1|2x|Pizza}}{{Conditional template call with newline|0|2x|Bora}}{{Conditional template call with newline|1|2x|Bang}}}}

which produces

PizzaPizza
BangBang

Notice how BoraBora is suppressed, and there is a newline between PizzaPizza and BangBang.

Sample 2

Example using {{Table row Dutch municipality}}

{| class="wikitable sortable"
!Municipality!!Population
{{Conditional template call with newline|1|Table row Dutch municipality|Delft}}{{Conditional template call with newline|0|Table row Dutch municipality|Hoorn}}{{Conditional template call with newline|1|Table row Dutch municipality|Rotterdam}}|}

gives

Municipality	Population

The template is typically called by another table row template, which has as parameter {{{1}}} the identification of the potential item (in this template: {{{3}}}), and some parameter {{{2}}} related to the condition. That template provides the condition in terms of {{{1}}} and {{{2}}}.

Sample 3

Sample usage with full substitution of the template to create a newline in wikitext.

1. Create a sample template : "Template:testnewline"

ABC{{<includeonly>subst:</includeonly>Conditional template call with newline|{{<includeonly>subst:</includeonly>#ifeq:{{{align|}}}|{{{align}}}|1|0}}|void|1|substctc=subst:|subst=subst:}}
DEF

2. When called empty ({{subst:testnewline}}), it generates the following wikitext:

ABC
DEF

3. When called as {{subst:testnewline|align=somevalue}}, it generates the following wikitext (note the newline):

ABC

DEF

Parameters

Mandatory parameters

1

1st unnamed parameter, a condition to be evaluated. Should result in 1 for true or 0 for false. One can use the result 0 or 1 directly. If the condition is true, the second template will be called and a newline added afterwards.
Sample condition: {{#ifeq:{{{align|}}}|{{{align}}}|1|0}}. The condition is true if the template is called with a parameter "align=somevalue", it's false if align is not included.

2

2nd unnamed parameter, the name of template to be called.
Can be "!" for Template:! or even "void" for Template:Void

Optional parameters

3

3rd unnamed parameter, value to be assigned to {{{1}}} when calling template {{{2}}}

substctc

for substitution of some parser functions and auxiliary templates called inside the template, use the value "subst:"; recommended when the template is substituted; note that in that case any parser functions or templates in the condition have to be substituted too.

subst

for substitution of template {{{2}}}, use the value "subst:"

p1n

name of an additional parameter used by template {{{2}}}

p1v

value to be assigned to {{{p1n}}} when calling template {{{2}}}