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Appropedia.org>Sophivorus at 13:20, 16 April 2024

2024-04-16T13:20:53Z

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{{Documentation subpage}}

Use this template to check whether a page exists. It differs from alternatives such as [[mw:Help:Extension:ParserFunctions#ifexist|#ifexist]] in that the page containing this template is not recorded as linking to or transcluding the page being checked. This has the advantage of avoiding spurious wikilinks and crowding pages like [[Special:WantedPages]], but has the disadvantage that the containing page may not be updated automatically when the checked page is created or deleted later.

== Examples ==

* <code><nowiki>{{EXISTS|Welcome to Appropedia}}</nowiki></code> → {{EXISTS|Welcome to Appropedia}}
* <code><nowiki>{{EXISTS|File:Appropedia.png}}</nowiki></code> → {{EXISTS|File:Appropedia.png}}
* <code><nowiki>{{EXISTS|Non-existent page}}</nowiki></code> → {{EXISTS|Non-existent page}}

Files in Commons are checked correctly:

* <code><nowiki>{{EXISTS|File:Arrow-down.svg}}</nowiki></code> → {{EXISTS|File:Arrow-down.svg}}
* <code><nowiki>{{EXISTS|File:Non-existent file.svg}}</nowiki></code> → {{EXISTS|File:Non-existent file.svg}}

But interwiki links always return true:

* <code><nowiki>{{EXISTS|Wikipedia:Science}}</nowiki></code> → {{EXISTS|Wikipedia:Science}}
* <code><nowiki>{{EXISTS|Wikipedia:Non-existent page}}</nowiki></code> → {{EXISTS|Wikipedia:Non-existent page}}

Empty calls refer to the current page (in this case, [[{{FULLPAGENAME}}]]):

* <code><nowiki>{{EXISTS| }}</nowiki></code> → {{EXISTS| }}
* <code><nowiki>{{EXISTS|}}</nowiki></code> → {{EXISTS|}}
* <code><nowiki>{{EXISTS}}</nowiki></code> → {{EXISTS}}

Finally, invalid titles (titles with [[mw:Manual:$wgLegalTitleChars|forbidden characters]]) always return false:

* <code><nowiki>{{EXISTS|<3}}</nowiki></code> → {{EXISTS|<3}}
* <code><nowiki>{{EXISTS|{{{1}}}}}</nowiki></code> → {{EXISTS|{{{1}}}}}

== See also ==

* [[mw:Help:Extension:ParserFunctions#ifexist and wanted pages]]
* [[Wikipedia:Template:Linkless exists]] - Doesn't check in Commons
* https://phabricator.wikimedia.org/T14019

<includeonly>
[[Category:Technical templates]]
</includeonly>

Template:EXISTS/doc - Revision history

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Appropedia.org>Sophivorus at 13:20, 16 April 2024