jquery.input_formatter.js

(function($){
    $.fn.extend({
        formatInput: function(custom_settings) {
            this.data("settings", $.extend({
                regex:".*",
                format_number: true,
                max_length: false,
                errback: null
            }, custom_settings);
            return this.each(function() {
                var elem = $(this);
                var settings = elem.data("settings");
                if(settings.format_number == true)
                {
                    elem.bind("keyup.format_number", $.fn.formatEvent);
                }
                elem.bind("keypress.filter_input", $.fn.filterEvent);
            });
        },
        filterEvent: function(e) {
            var s = this.data("settings");
            var regex = new RegExp(s.regex);
            var key = e.charCode ? e.charCode : e.keyCode ? e.keyCode : 0;
            var string = String.fromCharCode(key);
            var elem = $(this);
            if (key == 8 || key == 9 || key == 13 || key == 35 || key == 36|| key == 37 || key == 39 || key == 46) {

                if ($.browser.mozilla) {

                    // if charCode = key & keyCode = 0
                    // 35 = #, 36 = $, 37 = %, 39 = ', 46 = .

                    if (event.charCode == 0 && event.keyCode == key) {
                        return true;                                             
                    }

                }
            }
            if(s.max_length != false)
            {
                var value = elem.val();
                if(value != undefined && value.length >= s.max_length)
                {
                    return false;
                }
            }
            if(regex.test(string))
            {
                return true;
            } else {
                return false;
            }
        },
        formatEvent: function(e) {
            var elem = $(this);
            var initial_value = elem.val().replace(" ", "");
            elem.val($.fn.insertSpaces(initial_value));
        },
        insertSpaces: function(number) {
            return number.replace(/(\d)(?=(?:\d{3})+$)/g, "$1 ");
        }
    });
})(jQuery);