Template:Wy/syl/Ifsubst

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Usage

Meta template that returns the first parameter if evaluated during substitution, and the second parameter if evaluated during transclusion.
Note that this template must be used in safesubst mode to work properly:

{{ safesubst:<noinclude/>ifsubst| yes | no }}

The |demo= parameter can be used for testing the template. Set |demo=yes to always display the yes text, |demo=no to always display the no text, or |demo={{{demo|}}} to pass through the value from the parent template.

List of subst helper templates

• {{require substitution}} – Prints an error unless substituted.
• {{substituted or transcluded}} – if-then-else metatemplate that checks if a template is currently being substituted or transcluded

ERROR: This page is using an unprefixed version of template {{Tl}}

Use {{Wy/syl/Tl}} instead and replace all occurences of {{Tl}} in Wy/syl/ prefixed pages by that.

You may like to check 1 template in Category:Wy/syl/Templates using unprefixed template Tl first to remove all occurences from those templates which will fix the pages containing those templates too.

{{always substitute}} – For the doc of the above templates; prints a message asking for it be substituted.

ERROR: This page is using an unprefixed version of template {{Tl}}

Use {{Wy/syl/Tl}} instead and replace all occurences of {{Tl}} in Wy/syl/ prefixed pages by that.

You may like to check 1 template in Category:Wy/syl/Templates using unprefixed template Tl first to remove all occurences from those templates which will fix the pages containing those templates too.

{{never substitute}} – The reverse of Template:Tlf. For the doc of templates which should not be substituted; prints a message asking for it not to be substituted.

ERROR: This page is using an unprefixed version of template {{Tl}}

Use {{Wy/syl/Tl}} instead and replace all occurences of {{Tl}} in Wy/syl/ prefixed pages by that.

You may like to check 1 template in Category:Wy/syl/Templates using unprefixed template Tl first to remove all occurences from those templates which will fix the pages containing those templates too.

{{may be substituted}} – For the doc of templates whose substitution is optional.

ERROR: This page is using an unprefixed version of template {{Tl}}

Use {{Wy/syl/Tl}} instead and replace all occurences of {{Tl}} in Wy/syl/ prefixed pages by that.

You may like to check 1 template in Category:Wy/syl/Templates using unprefixed template Tl first to remove all occurences from those templates which will fix the pages containing those templates too.

{{substitution}} – Allows free-fill description of whether the template should be substituted and under what conditions.

ERROR: This page is using an unprefixed version of template {{Tl}}

Use {{Wy/syl/Tl}} instead and replace all occurences of {{Tl}} in Wy/syl/ prefixed pages by that.

You may like to check 1 template in Category:Wy/syl/Templates using unprefixed template Tl first to remove all occurences from those templates which will fix the pages containing those templates too.

{{ifsubst}} – Forks if substituted or not.

ERROR: This page is using an unprefixed version of template {{Tl}}

Use {{Wy/syl/Tl}} instead and replace all occurences of {{Tl}} in Wy/syl/ prefixed pages by that.

You may like to check 1 template in Category:Wy/syl/Templates using unprefixed template Tl first to remove all occurences from those templates which will fix the pages containing those templates too.

{{issubst}} – Returns "yes" if substituted.

ERROR: This page is using an unprefixed version of template {{Tl}}

Use {{Wy/syl/Tl}} instead and replace all occurences of {{Tl}} in Wy/syl/ prefixed pages by that.

You may like to check 1 template in Category:Wy/syl/Templates using unprefixed template Tl first to remove all occurences from those templates which will fix the pages containing those templates too.

{{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.

The above documentation is transcluded from Template:Wy/syl/Ifsubst/doc. (edit | history)
Editors can experiment in this template's sandbox (create | mirror) and testcases (create) pages.
Add categories to the /doc subpage. Subpages of this template.