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* Validates hex value
* @param {String} color hex color value
* @return {Boolean}
function isValidHex(color) {
if(!color || typeof color !== 'string') return false;
// Validate hex values
if(color.substring(0, 1) === '#') color = color.substring(1);
switch(color.length) {
case 3: return /^[0-9A-F]{3}$/i.test(color);
case 6: return /^[0-9A-F]{6}$/i.test(color);
case 8: return /^[0-9A-F]{8}$/i.test(color);
default: return false;
return false;
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