CFLib.org – Common Function Library Project

IsWebSafeColor(hexColor)

Last updated November 6, 2001

author

Eric Carlisle

Version: 1 | Requires: CF5 | Library: UtilityLib

Description:
Returns true if the given color is a web safe hexadecimal color. IsWebSafeColor accepts a 6 digit hexadecimal color as an agument. It returns true if the color is in the 216 color web safe pallette. If not, it returns false.

Return Values:
Returns a Boolean value.

Example:

<CFSET Color1="3366cc">
<CFSET Color2="c0c0c0">
<cfoutput>
Is #Color1# a web safe color? #YesNoFormat(IsWebSafeColor(Color1))#<BR>
Is #Color2# a web safe color? #YesNoFormat(IsWebSafeColor(Color2))#<BR>
</cfoutput>

Parameters:

Name Description Required
hexColor Hex color representation to validate. Yes

Full UDF Source:

/**
 * Returns true if the given color is a web safe hexadecimal color.
 * 
 * @param hexColor 	 Hex color representation to validate. 
 * @return Returns a Boolean value. 
 * @author Eric Carlisle (ericc@nc.rr.com) 
 * @version 1, November 6, 2001 
 */
function IsWebSafeColor(hexColor){
  /* Establish list of web safe colors */
  Var safeList = "00,33,66,99,cc,ff";
	
  /* Strip out poundsigns from argument. */
  Var tHexColor = replace(hexColor,'##','','ALL');

  /* Initialize i */
  Var i=0;
  
  /* Loop over r,g,b hex values */
  for (i=1; i lte 5; i=i+2){
		
    /* Set result to FALSE if a color isn't web safe. */	
    if (listFindNoCase(safeList,mid(tHexColor,i,2)) eq 0){
      return False;
    }
  }
  return True;
}
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