jquery.shuffleLetters.js

// random shuffle

(function myshuffle($) {

    $.fn.shuffleLetters = function (prop) {

        var options = $.extend({
            "step": 10,
            "fps": 20,
            "text": ""
        }, prop)
        return this.each(function () {

            var el = $(this),
                str = "";
            el.data('animated', true);

            if (options.text) {
                str = options.text.split('');
            }
            else {
                str = el.text().split('');
            }

            var types = [],
                letters = [];

            for (var i = 0; i < str.length; i++) {

                var ch = str[i];

                if (ch == " ") {
                    types[i] = "space";
                    continue;
                }
                else if (/[a-z]/.test(ch)) {
                    types[i] = "lowerLetter";
                }
                else if (/[A-Z]/.test(ch)) {
                    types[i] = "upperLetter";
                }
                else {
                    types[i] = "symbol";
                }

                letters.push(i);
            }

            el.html("");


            (function shuffle(start) {

                var i,
                    len = letters.length,
                    strCopy = str.slice(0);

                if (start > len) {
                    el.data('animated', false);
                    return;
                }

                for (i = Math.max(start, 0); i < len; i++) {

                    if (i < start + options.step) {

                        strCopy[letters[i]] = randomChar(types[letters[i]]);
                    }
                    else {
                        strCopy[letters[i]] = "";
                    }
                }

                el.text(strCopy.join(""));

                setTimeout(function () {

                    shuffle(start + 1);

                }, 1000 / options.fps);

            })(-options.step);


        });
    };

    function randomChar(type) {
        var pool = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789,.?/\\(^)![]{}*&^%$#'\"";
        var arr = pool.split('');
        return arr[Math.floor(Math.random() * arr.length)];
    }

})(jQuery);