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Help:Substitution: Difference between revisions
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{{short description|Help about using templates}} | {{short description|Help about using templates}} | ||
{{for|detailed guidance on when to use substitution rather than transclusion|Wikipedia:Substitution}} | {{for|detailed guidance on when to use substitution rather than transclusion|Wikipedia:Substitution}} | ||
'''Substitution''' is a function whereby, when an editor saves a page, an item in the wikicode is permanently replaced with its current value. In particular, [[Help:Template|templates]] and [[Help:Magic words|magic words]] can be substituted, as an alternative to [[Help:Transclusion|transclusion]]. The difference is that when a template is substituted on a page, its appearance on that page will no longer be affected by later changes made to the template itself (as is the case in a transcluded template). | '''Substitution''' is a function whereby, when an editor saves a page, an item in the wikicode is permanently replaced with its current value. In particular, [[Help:Template|templates]] and [[Help:Magic words|magic words]] can be substituted, as an alternative to [[Help:Transclusion|transclusion]]. The difference is that when a template is substituted on a page, its appearance on that page will no longer be affected by later changes made to the template itself (as is the case in a transcluded template). | ||
Substitution is done using the <code>subst:</code> modifier after the double opening braces. For example, to substitute the template {{tl|afd}}, type <code><nowiki>{{subst:afd}}</nowiki></code>. You can check the resulting wikitext before saving by clicking "Show changes" (and see what the page will look like by clicking "Show preview"). | Substitution is done using the <code>subst:</code> modifier after the double opening braces. For example, to substitute the template {{tl|afd}}, type <code><nowiki>{{subst:afd}}</nowiki></code>. You can check the resulting wikitext before saving by clicking "Show changes" (and see what the page will look like by clicking "Show preview"). | ||
Variables and [[Help:Parser functions|parser functions]] can also be substituted, meaning that their current value will be recorded permanently on the page – they will not be re-evaluated whenever someone views the page. | |||
==When to use substitution== | ==When to use substitution== | ||