Template:Blank: Difference between revisions
(Created page with "<nowiki></nowiki><noinclude> This empty template is useful for introducing spaces or line breaks in places where they would normally be auto-removed. To explain why this is needed, let's look at the following code first: <pre> Paragraph 1 {{#if: condition | Paragraph 2 }} Paragraph 3 </pre> If all the conditions are met, it works fine: Paragraph 1 {{#if: condition | Paragraph 2 }} Paragraph 3 But if some of the conditions aren't met, it will produce too m...") |
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</pre> | </pre> | ||
If all the | If all the condition is met, it works fine: | ||
Paragraph 1 | Paragraph 1 | ||
| Line 24: | Line 24: | ||
Paragraph 3 | Paragraph 3 | ||
But if | But if the condition isn't met, it will produce too much empty space, like this: | ||
Paragraph 1 | Paragraph 1 | ||
| Line 45: | Line 45: | ||
</pre> | </pre> | ||
That works exactly as desired when the | That works exactly as desired when the condition ''isn't'' met: | ||
Paragraph 1 {{#if: | | Paragraph 1 {{#if: | | ||
| Line 54: | Line 54: | ||
Paragraph 3 | Paragraph 3 | ||
But... When the | But... When the condition ''is'' met, it doesn't work as expected! It does this weird thing instead: | ||
Paragraph 1 {{#if: condition | | Paragraph 1 {{#if: condition | | ||
| Line 63: | Line 63: | ||
Paragraph 3 | Paragraph 3 | ||
Why does that happen? It's because parser functions like {{code|#if}} strip all blanks (spaces and line breaks) that come before and after the | Why does that happen? It's because parser functions like {{code|#if}} strip all blanks (spaces and line breaks) that come before the first non-blank character, and after the last non-blank character. So the line breaks after {{code|<nowiki>{{#if: condition |</nowiki>}} are completely ignored! | ||
This can be solved with the following trick. Note the use of the empty {{code|nowiki}} tag: | This can be solved with the following trick. Note the use of the empty {{code|nowiki}} tag: | ||
| Line 88: | Line 88: | ||
Paragraph 3 | Paragraph 3 | ||
</pre> | </pre> | ||
Result: | |||
Paragraph 1 {{#if: condition | {{blank}} | |||
Paragraph 2 | |||
}} | |||
Paragraph 3 | |||
</noinclude> | </noinclude> | ||
Latest revision as of 22:01, 2 August 2023
This empty template is useful for introducing spaces or line breaks in places where they would normally be auto-removed.
To explain why this is needed, let's look at the following code first:
Paragraph 1
{{#if: condition |
Paragraph 2
}}
Paragraph 3
If all the condition is met, it works fine:
Paragraph 1 Paragraph 2 Paragraph 3
But if the condition isn't met, it will produce too much empty space, like this:
Paragraph 1 Paragraph 3
Let's try to improve on this by making sure we don't introduce empty paragraphs:
Paragraph 1 {{#if: condition |
Paragraph 2
}}
Paragraph 3
That works exactly as desired when the condition isn't met:
Paragraph 1 Paragraph 3
But... When the condition is met, it doesn't work as expected! It does this weird thing instead:
Paragraph 1 Paragraph 2 Paragraph 3
Why does that happen? It's because parser functions like #if strip all blanks (spaces and line breaks) that come before the first non-blank character, and after the last non-blank character. So the line breaks after {{#if: condition | are completely ignored!
This can be solved with the following trick. Note the use of the empty nowiki tag:
Paragraph 1 {{#if: condition | <nowiki></nowiki>
Paragraph 2
}}
Paragraph 3
The empty tag ends the blank auto-removal at the point it's inserted, so the line breaks that come after are not ignored.
It's tedious to write <nowiki></nowiki> every time, so you can instead use this blank template, which can fulfill the exact same purpose:
Paragraph 1 {{#if: condition | {{blank}}
Paragraph 2
}}
Paragraph 3
Result:
Paragraph 1 Paragraph 2 Paragraph 3