Price formatter

jquery.KVNum.js

(function ($) {
    $.fn.KVNum = function (method) {
        var settings = {

        };

        function process($input){
            var input = $($input)[0];

            var value = $input.val(),
                start = input.selectionStart,
                end = input.selectionEnd,
                spaces = 0;

            value = value + '';

            value = value.replace(/[^0-9,.]/g, "");

            var l1 = value.length;

            value = value.replace(/\B(?=(\d{3})+(?!\d))/g, " ");

            var l2 = value.length;

            spaces = l2 - l1 - $input.data('spaces');

            $input.data('spaces', $input.data('spaces') + spaces);

            if(parseInt(value) > 0){
                value = parseInt(value.replace(/[^0-9]/g, "")).toString();
                value = value.replace(/\B(?=(\d{3})+(?!\d))/g, " ");
            }

            $input.val(value);

            if(spaces >= 0){
                $input[0].setSelectionRange(start + spaces, end + spaces);
            }
        }

        var methods = {
            apply: function(){
                return this.each(function () {
                    process($(this));
                });
            },

            init: function (options) {
                return this.each(function () {
                    var $this = $(this),
                        data = $this.data('KVNum');

                    if (!data) {
                        $this.data('KVNum', {
                            settings: $.extend(settings, options)
                        });

                        $(this).data('spaces', 0);

                        $this.off('keyup.KVNum').on('keyup.KVNum', function(e){
                            var KEYS = [37, 38, 39, 40, 13, 9, 16];

                            if(!in_array(e.keyCode, KEYS)) {
                                process($this);
                            }
                        });

                        $this.off('blur.KVNumClear').on('blur.KVNumClear', function(){
                            var value = $(this).val();

                            if(parseInt(value) <= 0){
                                value = '0';
                            }

                            $(this).val(value);
                            $(this).data('spaces', 0);
                        });
                    }
                });
            }
        };

        if (methods[method]) {
            return methods[ method ].apply(this, Array.prototype.slice.call(arguments, 1));
        } else if (typeof method === 'object' || !method) {
            return methods.init.apply(this, arguments);
        } else {
            $.error('KVNum Invalid method!');
        }
    };
})(jQuery);