模板:IsNumber
This template is used to determine whether an input is an integer number. This is useful in cases where it is ambiguous if, for instance, the value of a template parameter is the name or the ID of an item.
It only recognizes purely numerical strings, i.e., strings consisting of one or more digits. It also recognizes a minus sign in front of the digits (if the $onlypositive
Note that it might sometimes be preferable to use a combination of {{#iferror:}} and {{#expr:}}. That allows recognizing all valid {{#expr:}} syntax, e.g. formulas, which might be useful if the following logic uses {{#expr:}} itself.
Usage
{{ isNumber | <string to check> | onlypositive= y/yes }}
- First unnamed parameter
The string which is to be checked if it consists of a number.
- onlypositive
Set this parameter to disregard numbers with a minus sign in the front.
Examples
| Code | Result |
|---|---|
{{isNumber|42}} |
y |
{{isNumber|forty-two}} |
|
{{isNumber| 42 }} |
y |
{{isNumber|4 2}} |
|
{{isNumber|-42}} |
y |
{{isNumber|-42|onlypositive=y}} |
|
{{isNumber|- 42}} |
|
{{isNumber|42.1}} |
|
{{isNumber|42,000}} |
|
{{isNumber|42000}} |
y |
{{isNumber|}} |
|
{{isNumber|-}} |