jquery.input_formatter.js

(function($){
        $.fn.extend({
                formatInput: function(custom_settings) {
                        settings = $.extend({
                                regex:".*",
                                format_number: true,
                                max_length: false,
                                errback: null
                        }, custom_settings);
                        return this.each(function() {
                                var elem = $(this);
                                if(settings.format_number == true)
                                {
                                        elem.bind("keyup.format_number", $.fn.formatEvent);
                                }
                                elem.bind("keypress.filter_input", $.fn.filterEvent);
                        });
                },
                filterEvent: function(e) {
                        var s = 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);