Railo 4.2 Reference
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Tests for a parameter's existence, tests its data type, and provides a default value if one is not assigned.


This tag can't have a body.


		[type="string"] ... >
This tag is also supported within cfscript
		[type="string"] ... ;


This tag has a fixed definition of attributes (see below). In addition it allowes to use any additional attribute.
Name Type Required Description
default any No Default value to set the parameter to if it does not exist. 
max number No define the biggest size of a numeric value, used for type range 
maxlength int No define the maxlength of a value for this types: email, url and string 
min number No define the smallest size of a numeric value, used for type range 
name string Yes The name of the parameter to test, such as Client.Email or Cookie.BackgroundColor. If
you omit the DEFAULT attribute, an error occurs if the specified parameter does not exist 
pattern string No define a regular expression pattern, to check value against 
type string No The type of parameter that is required. The default is 'any' and valid values are:
  • any: any type of value
  • array: an array of values
  • binary: a binary value
  • boolean: a Boolean value
  • creditcard: a 13-16 digit number conforming to the mod10 algorithm
  • date or time: a date-time value
  • email: a valid e-mail address
  • eurodate: a date-time value. Any date part must be in the format dd/mm/yy. The format can use /, -, or . characters as delimiters
  • float or numeric: a numeric value
  • guid: a Universally Unique Identifier of the form "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX" where � X� is a hexadecimal number
  • integer: an integer
  • query: a query object
  • range: a numeric range, specified by the min and max attributes
  • regex or regular_expression: matches input against pattern attribute
  • ssn or social_security_number: a U.S. social security number
  • string: a string value or single character
  • struct: a structure
  • telephone: a standard U.S. telephone number
  • url: an http, https, ftp, file, mailto, or news URL
  • uuid: a ColdFusion Universally Unique Identifier, formatted � XXXXXXXX-XXXX-XXXX-XXXXXXXXXXXXXXX�, where � X� is a hexadecimal number. See CreateUUID
  • usdate: a U.S. date of the format mm/dd/yy, with 1-2 digit days and months, 1-4 digit years
  • variableName: a string formatted according to ColdFusion variable naming conventions
  • xml: XML objects and XML strings
  • zipcode: U.S., 5- or 9-digit format ZIP codes