Cold Fusion Validate Currency value??

An example of validation at the server

<!--- Define your locale. See https://helpx.adobe.com/coldfusion/cfml-reference/coldfusion-functions/functions-s/setlocale.html --->

<cfset newLocale = SetLocale("English (UK)")>

<!--- Initialize --->

<cfset isValueValidCurrency = false>

<cfset validationMsg = "No value submitted.">

<cfif isDefined("form.myValue") and trim(form.myValue) is not "">

    <!--- Validate --->

    <cfif LSIsCurrency(form.myValue)>

        <cfset isValueValidCurrency = true>

        <cfset validationMsg = "Value is valid currency in locale " & getLocale()>

        <cfoutput>

        value: #LSCurrencyFormat(form.myValue)# <br>

        msg: #validationMsg#

        </cfoutput>

    <cfelse>

        <cfset validationMsg = "Value '" & form.myValue & "' is not valid currency in locale " & getLocale()>

    </cfif>

</cfif>

<cfif isValueValidCurrency>

    <!--- Validation succeeded. Proceed with business code --->   

<cfelse>

<cfoutput>

Message: #validationMsg# <br>

<form action="#CGI.SCRIPT_NAME#" method="post">

    <input name="myValue" type="text">

    <input name="sbmt" type="submit" value="Submit">

</form>

</cfoutput>

</cfif>

Server-side validation is the best approach for form validation.  As much as I love JavaScript, it can be easily bypassed.

There are a couple of ways, I guess.

One would be to use a REGEX to match the value.  REmatch() returns an array of the instances found within the string.  If the arrayLen() of the array is not 1, then you can be _reasonably_ sure the entry is not valid.

OR, you could use IsNumeric(), but I've heard of issues with that (ie, "100e100" is a valid numeric value.)  Or IsValid(type,string); but that might have issues, too - although you can use REGEX to make sure.

HTH,

^_^

UPDATE:  Don't completely discount JavaScript - not for validation, but for masking.  There are scripts available that can format the value as it is entered - deny anything that isn't an integer, and automatically format for "0.00" where 0 is any number.  Just a thought.

UPDATE2:  Oh, and please - don't use CFFORM and the built-in form validation.  It's not that good, and you don't have much granular control.