Template:Issubst
 | This template is used on approximately 64,000 pages and changes may be widely noticed. Test changes in the template's /sandbox or /testcases subpages, or in your own user subpage. Consider discussing changes on the talk page before implementing them. |
Usage
Meta template that returns "yes" if evaluated during substitution, and the empty string if evaluated during transclusion.
Note that this template must be used in safesubst mode to work properly:
{{ safesubst:<noinclude/>issubst}}
Examples
- "
{{issubst}}" → "" - "
{{subst:issubst}}" → "yes"
List of subst helper templates
- {{require substitution}} – Prints an error unless substituted.
- {{ifsubst}} – if-then-else metatemplate that checks if a template is currently being substituted or transcluded.
- {{always substitute}} – For the doc of the above templates; prints a message asking for it be substituted.
- {{frequently substituted}} – Notice displayed in the documentation of substitution templates notifying the user that the template is widely used.
- {{never substitute}} – The reverse of {{always substitute}}. For the doc of templates which should not be substituted; prints a message asking for it not to be substituted.
- {{can be substituted}} – For the doc of templates whose substitution is optional.
- {{may be substituted}} – Same as the template above, but with the adverb may being used in the notice (instead of can).
- {{substitution}} – Allows free-fill description of whether the template should be substituted and under what conditions.
- {{issubst}} – Returns "yes" if substituted.
- {{HTML comment}} – To sign substitutions with comments that contain wikitext expansions.
- Module:Unsubst – Prevents substitution.
- Module:Unsubst-infobox – Prevents substitution for infoboxes, cleans up parameters.