Difference between revisions of "Template:Category handler/numbered/doc"

Latest revision as of 14:36, 23 January 2013

This template is used on 2,100,000+ pages. To avoid large-scale disruption and unnecessary server load, any changes to this template should first be tested in the template's /sandbox or /testcases subpages, or in your own user space. The tested changes can then be added in one single edit to the template. Please consider discussing any changes on the talk page before implementing them.

This is the {{category handler/numbered}} sub-template.

Do not use this template directly, use {{category handler}} instead. This template is called from {{category handler}}, see user documentation there.

The rest of the sections here are only for those that want to understand the internal workings of this template.

Technical details

This sub-template makes it possible for its parent-template to take input in two forms:

{{category handler
| 1 = Input
| main = 1
| talk = 1   <!--Reusing "Input" for both the main and talk parameters-->
}}

{{category handler
| main = Input1
| talk = Input2   <!--Instead feeding text directly to the talk parameter-->
}}

This sub-template takes a bunch of numbered parameters. There's no limit to the number of parameters it can use, other than what the servers and MediaWiki system can handle.

It also takes a parameter named data. If data is a number, then it returns the data of the corresponding numbered parameter. If data is something else, for instance a category name, then it returns data unchanged.

Here's how you would normally call this sub-template:

{{category handler/numbered
| 1 = {{{1|}}}
| 2 = {{{2|}}}
| 3 = {{{3|}}}
| 4 = {{{4|}}}
| data = Input can be a number between 1-4, or something else.
}}

In the above example, since the parent-template feeds only 1-4, then only the numbers 1-4 will work properly. Feeding other numbers will return an empty string.

See also

• Help:Extension:ParserFunctions – About {{#iferror:||}} etc.