CFLib.org – Common Function Library Project

Description:
Checkes to see if a color is a valid 3 or 6 character hex color, or one of the ColdFusion safe color keywords (aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, purple, red, silver, teal, white, and yellow).

Return Values:
returns a Boolean

Example:

Is #fff a valid color? <cfdump var="#IsColor('##fff')#"><br />
Is #0fff a valid color? <cfdump var="#IsColor('##0fff')#"><br />
Is #000fff a valid color? <cfdump var="#IsColor('##000fff')#"><br />
Is blue a valid color? <cfdump var="#IsColor('blue')#"><br />
Is brown a valid color? <cfdump var="#IsColor('brown')#">

Parameters:

Full UDF Source:

<!---
 Checkes to see if a color is a valid 3 or 6 character hex color, or one of the ColdFusion safe color keywords.
 
 @param color      string of color to test (Required)
 @return returns a Boolean 
 @author Jon Hartmann (jon.hartmann@gmail.com) 
 @version 0, May 9, 2009 
--->
<cffunction name="IsColor" access="public" output="false" returntype="boolean">
    <cfargument name="color" type="string" required="true" />
        
    <cfset var local = structNew() />
    <cfset local.colorNames = "aqua,black,blue,fuchsia,gray,green,lime,maroon,navy,olive,purple,red,silver,teal,white,yellow" />
    <cfset local.regex = "^(##([\dA-F]{3}|[\dA-F]{6})|([\dA-F]{3}|[\dA-F]{6}))$" />
    <cfset local.returnValue = false />
        
    <cfif listFind(local.colorNames, arguments.color) OR arrayLen(REMatchNoCase(local.regex, arguments.color)) gt 0>
        <cfset local.returnValue = true />
    </cfif>
    
    <cfreturn local.returnValue />
</cffunction>