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IsValid
DescriptionTests
whether a value meets a validation or data type rule.
ReturnsTrue,
if the value conforms to the rule; False, otherwise.
Function syntaxIsValid(type, value)
isValid("range", value, min, max)
isValid("regex" or "regular_expression", value, pattern)
HistoryColdFusion
8: Added the component value for to the type attribute.
ColdFusion
MX 7: Added this function.
Parameters
Parameter
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Description
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type
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The valid format for the data; one of the
following. For detailed information on validation algorithms, see Validating
form data using hidden fields in the Developing ColdFusion Applications.
any: any simple value. Returns false for complex values,
such as query objects;; equivalent to the IsSimpleValue function.
array: an ColdFusion array; equivalent to the IsArray function.
binary: a binary value;; equivalent to the IsBinary function.
boolean: a Boolean value: yes, no, true, false, or a number;
equivalent to the IsBoolean function.
component: a ColdFusion component (CFC).
creditcard: a 13-16 digit number conforming to the mod10
algorithm.
date or time: any date-time value, including dates or times;;
equivalent to the IsDate function..
email: a valid email address.
eurodate: any date-time value, including US date formats
and time values,
float or numeric: a numeric value; equivalent to the IsNumeric function.
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; equivalent to the IsQuery function.
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, including single characters and numbers
struct: a structure; equivalent to the IsStruct function.
telephone: a standard US 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.
zipcode: U.S., 5- or 9-digit format ZIP codes.
maxlength: Specifies a maximum number of characters
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value
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The value to test
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min
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The minimum valid value; used only for range validation
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max
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The maximum valid value; used only for range validation
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pattern
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A JavaScript regular expression that the
parameter must match; used only for regex or regular_expression validation.
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UsageThe IsValid function
lets you assure that validation is performed on the server. You
can use the cfparam tag to perform equivalent
validation.
ExampleThe
following example checks whether a user has submitted a numeric
ID and a valid e-mail address and phone number. If any of the submitted
values does not meet the validation test, it displays an error message.
<cfif isDefined("form.saveSubmit")>
<cfif isValid("integer", form.UserID) and isValid("email", form.emailAddr)
and isValid("telephone", form.phoneNo)>
<cfoutput>
<!--- Application code to update the database goes here --->
<h3>The email address and phone number for user #Form.UserID#
have been added</h3>
</cfoutput>
<cfelse>
<H3>You must supply a valid User ID, phone number, and email address.</H2>
</cfif>
<cfelse>
</cfif>
<cfform action="#CGI.SCRIPT_NAME#">
User ID:<cfinput type="Text" name="UserID"><br>
Phone: <cfinput type="Text" name="phoneNo"><br>
email: <cfinput type="Text" name="emailAddr"><br>
<cfinput type="submit" name="saveSubmit" value="Save Data"><br>
</cfform>
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