Template:Substcheck
SUBST
 | This template is used by Template:WPBannerMeta. Please discuss at Template talk:WPBannerMeta before making any changes. |
| This template may have no transclusions, because it is used when templates are substituted, often inside <includeonly>...</includeonly> tags. This template's name appears in the wikitext of 2,000+ pages. |
This template can be used in conditional processing in other templates to detect substitutions.
If you use Module:Unsubst, you need not use this template.
Usage
If you put <includeonly>{{subst:</includeonly><includeonly>substcheck}}</includeonly> into a template, it will expand into one of the following, depending how the template is being viewed.
- SUBST if the template is being substituted
- {{subst:substcheck}} if the template is being transcluded
- Empty string if you are viewing the template page.
Using this template differently may yield different results; the above is the most universal way.
Lua replacement
<syntaxhighlight lang="lua"> if mw.isSubsting() then -- substituting: "SUBST" elseif mw.getCurrentFrame():getParent():getTitle() == mw.title.getCurrentTitle().fullText then -- viewed directly: "" else -- transclusion: "{{subst:substcheck}}" end </syntaxhighlight>