HRWiki:Counter

Usage

{{#count:id|increment}}	Increments the counter id by increment and displays the result; increment can be omitted, and defaults to 1.
{{#resetcount:id|value|increment}}	Silently sets the counter id to value minus increment (so that the next count by increment will display value); value and increment can be omitted, and both default to 1.
{{hcount}} {{vcount}}	Used in sortable tables. See below.

Examples

count is a parser function that returns an integer that increments each time the function is called:

Code	Gives
{{#count:basic}}	1
{{#count:basic}}	2
{{#count:basic}}	3
{{#count:basic}}	4
{{#count:basic}}	5

The counters can be given different names, so you can have more than one of them on the same page:
(The actual name doesn't matter, so long as they're different. If you use a counter in a template, pick a name that'll be unique.)

Code	Gives
{{#count:first}}	1
{{#count:second}}	1
{{#count:second}}	2
{{#count:second}}	3
{{#count:first}}	2
{{#count:second}}	4

You can also make the counter count by twos, or by any other number:

Code	Gives
{{#count:evens|2}}	2
{{#count:evens|2}}	4
{{#count:evens|2}}	6
{{#count:evens|2}}	8
{{#count:evens|2}}	10

Different increments can be used at different times, depending on what is needed:

Code	Gives
{{#count:strange|1}}	1
{{#count:strange|1}}	2
{{#count:strange|3}}	5
{{#count:strange|0}}	5
{{#count:strange|-1}}	4
{{#count:strange|2}}	6

The counter can be reset partway through a page:

Code	Gives
{{#count:basic}}	1
{{#count:basic}}	2
{{#count:basic}}	3
{{#resetcount:basic}}
{{#count:basic}}	1
{{#count:basic}}	2
{{#count:basic}}	3

You can also set what number you want to start on:

Code	Gives
{{#resetcount:starting|11}}
{{#count:starting}}	11
{{#count:starting}}	12
{{#count:starting}}	13
{{#count:starting}}	14
{{#count:starting}}	15

If you're using an increment, you need to give it to #resetcount too:

Code	Gives
{{#resetcount:starting evens|14|2}}
{{#count:starting evens|2}}	14
{{#count:starting evens|2}}	16
{{#count:starting evens|2}}	18
{{#count:starting evens|2}}	20
{{#count:starting evens|2}}	22

Use a negative increment to count down. As noted above, be sure to pass the increment to #resetcount too:

Code	Gives
{{#resetcount:countdown|3|-1}}
{{#count:countdown|-1}}	3
{{#count:countdown|-1}}	2
{{#count:countdown|-1}}	1
{{#count:countdown|-1}}	0
{{#count:countdown|-1}}	-1

You can use the counter in other parser functions:

Code	Gives
{{#ifexpr:{{#count:alternate}} mod 2 = 0|even|odd}}	odd
{{#ifexpr:{{#count:alternate}} mod 2 = 0|even|odd}}	even
{{#ifexpr:{{#count:alternate}} mod 2 = 0|even|odd}}	odd
{{#ifexpr:{{#count:alternate}} mod 2 = 0|even|odd}}	even
{{#ifexpr:{{#count:alternate}} mod 2 = 0|even|odd}}	odd

Code	Gives
{{#expr:{{#count:squares}} * {{#count:squares|0}}}}	1
{{#expr:{{#count:squares}} * {{#count:squares|0}}}}	4
{{#expr:{{#count:squares}} * {{#count:squares|0}}}}	9
{{#expr:{{#count:squares}} * {{#count:squares|0}}}}	16
{{#expr:{{#count:squares}} * {{#count:squares|0}}}}	25

Sortable Tables

When using count in sortable tables, please use the {{hcount}} and {{vcount}} templates. Be sure to carefully read their documentation in order to sort table entries correctly.