User:Addyrielle/Conditional tables

Here's some more notes from the wiki!

ParserFunctions allow for the conditional display of table rows, columns or cells.

Basic use for #if

{{#if:{{{variable_foo|}}}
|foo is set to '''{{{variable_foo}}}'''
|foo is ''blank''}}

^ This gets checked to see if the foo variable is blank. Eg:

---

Template call	Result
{{if_example_1}}	foo is ''blank''
{{if_example_1|variable_foo=}}	foo is ''blank''
{{if_example_1|variable_foo=value}}	foo is set to '''value'''

---

Positional parameters {{{1}}} etc. work like named parameters:

{{#if:{{{1|}}}
|1st parameter is '''{{{1}}}'''
|1st parameter is ''blank''}}

---

Template call	Result
{{if_example_1/b| |bar}}	1st parameter is blank
{{if_example_1/b|foo|bar}}	1st parameter is foo
{{if_example_1/b|[[m:|not empty]]}}	1st parameter is not empty
{{if_example_1/b|bad=idea}}	1st parameter is blank
{{if_example_1/b|1=ok=yes}}	1st parameter is ok=yes

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Note: The pipe symbol in the link works as is, it's not quite that easy within Wiki tables - it messes up. Use the method below to remedy this.

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This method of hiding rows in tables (or other structures within tables) uses HTML directly. In general, there are only a few HTML tags you need to be aware of:

• <tr> - this tag creates a new row (similar to |- in MediaWiki table syntax).
• <th> - this tag creates a new header cell within a row (similar to ! in MediaWiki table syntax).
• <td> - this tag creates a new cell within a row (similar to | in MediaWiki table syntax).
• <caption><nowiki> - this tag creates a caption (similar to |+ in MediaWiki table syntax). <nowiki>{| class="infobox"
  

{{#if:{{{variable_foo|}}}
|<tr><th>Foo</th><td>{{{variable_foo}}}</td></tr>}}
|
! Bar
| {{{variable_bar}}}
|}