randomstring.js

randomstring.js

/**
 * Generate a random string.
 * 
 * @param alphabet (optional)   The alphabet used to generate a random string.
 * @param minLength (optional)  The minimum length of the string. 10 by default.
 * @param maxLength (optional)  The maximum length of the string. 20 by default.
 *
 * @author Craig Anderson <[email protected]>
 * @link https://gist.github.com/4075392
 */
function randomString(alphabet, minLength, maxLength) {
	if(typeof alphabet == "undefined") {
		alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
	}
	if(typeof minLength == "undefined") {
		minLength = 10;
	}
	if(typeof maxLength == "undefined") {
		maxLength = 20;
	}
	var s = "";
	var alphabetLength = alphabet.length;
	var length = Math.floor((Math.random() * minLength) + (maxLength - minLength));
	for(var i = 0; i < length; i++) {
		s += alphabet.charAt(Math.floor(Math.random() * alphabetLength));
	}
	return s;
}