Jquery 输入金额格式限制 插件

(function($) {

    $.fn.extend({

        money_mode: function(options) {

            var defaults = {

                decimal_length: 2,//小数点位数

                format: "#,###.00",//格式化类型

                locale: "us"

            };

            var options = $.extend(defaults, options);

            var len = parseInt(options['decimal_length']);

            return this.each(function() {

                var input = $(this);

                input.css("ime-mode", "disabled");

                var decimal_point = false;

                input.bind("keypress", function() {

                    if (event.keyCode == 46) {

                        if (input.val().indexOf(".") != -1 || (input.val().lastIndexOf(".") == (input.val().length - 1))) {

                            return false;

                        }

                    } else {

                        if (decimal_point)

                            return false;

                        else

                            return event.keyCode >= 46 && event.keyCode <= 57;

                    }

                });

                input.bind("blur", function() {

    // begin失去焦点后字符串格式化 

                var formatData = formatCodes(options.locale.toLowerCase());

            var valid = formatData.valid;

            var dec = formatData.dec;

            var group = formatData.group;

            var neg = formatData.neg;

                    if (input.val() != null && input.val() != '') {

                        var text = new String(jQuery(input).text());

                        if (jQuery(input).is(":input"))

                            text = new String(jQuery(input).val());

                        var isValid = true;

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

                            if (valid.indexOf(text.charAt(i)) == -1)

                                isValid = false;

                        }

                        if (isValid) {

                            var number = new Number(text.replace(group, '').replace(dec, ".").replace(neg, "-"));

                            var returnString = "";

                            var decimalValue = number % 1;

                            if (options.format.indexOf(".") > -1) {

                                var decimalPortion = dec;

                                var decimalFormat = options.format.substring(options.format.lastIndexOf(".") + 1);

                                var decimalString = new String(decimalValue.toFixed(decimalFormat.length));

                                decimalString = decimalString.substring(decimalString.lastIndexOf(".") + 1);

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

                                    if (decimalFormat.charAt(i) == '#' && decimalString.charAt(i) != '0') {

                                        decimalPortion += decimalString.charAt(i);

                                        break;

                                    }

                                    else if (decimalFormat.charAt(i) == "0") {

                                        decimalPortion += decimalString.charAt(i);

                                    }

                                }

                                returnString += decimalPortion

                            }

                            else

                                number = Math.round(number);

                            var ones = Math.floor(number);

                            var onePortion = "";

                            if (ones == 0) {

                                onePortion = "0";

                            }

                            else {

                                // find how many digits are in the group

                                var onesFormat = "";

                                if (options.format.indexOf(".") == -1)

                                    onesFormat = options.format;

                                else

                                    onesFormat = options.format.substring(0, options.format.indexOf("."));

                                var oneText = new String(ones);

                                var groupLength = 9999;

                                if (onesFormat.lastIndexOf(",") != -1)

                                    groupLength = onesFormat.length - onesFormat.lastIndexOf(",") - 1;

                                var groupCount = 0;

                                for (var i = oneText.length - 1; i > -1; i--) {

                                    onePortion = oneText.charAt(i) + onePortion;

                                    groupCount++;

                                    if (groupCount == groupLength && i != 0) {

                                        onePortion = group + onePortion;

                                        groupCount = 0;

                                    }

                                }

                            }

                            returnString = onePortion + returnString;

                            if (number < 0)

                                returnString += neg;

                            if (jQuery(this).is(":input"))

                                jQuery(this).val(returnString);

                            else

                                jQuery(this).text(returnString);

                        }

                    }

     // end 失去焦点后字符串格式化 

                })

                input.bind("paste", function() {

                    var s = clipboardData.getData('text');

                    if (!//D/.test(s));

                    value = s.replace(/^0*/, '');

                    return false;

                })

                input.bind("dragenter", function() {

                    return false;

                })

                input.bind("keyup", function() {

                    if (input.val() != null && input.val() != '') {

                        if (input.val().indexOf(".") == -1) {

                            return true;

                        }

                        else {

                            var decimalIndex = input.val().indexOf('.');

                            var decimalPart = input.val().substring(decimalIndex + 1, input.val().length);

                            if (decimalPart.length == len) {

                                decimal_point = true;

                                return false;

                            }

                            else

                                return true;

                        }

                    }

                    else {

                        decimal_point = false;

                        return false;

                    }



                });

            });

        }

    });

    function formatCodes(locale) {

        // default values

        var valid = "1234567890.,-";

        var dec = ".";

        var group = ",";

        var neg = "-";

        if (locale == "us" || locale == "cn" || locale == "tw") {

            valid = "1234567890.,-";

            dec = ".";

            group = ",";

        }

        return new FormatData(valid, dec, group, neg);

    };

    function FormatData(valid, dec, group, neg) {

        this.valid = valid;

        this.dec = dec;

        this.group = group;

        this.neg = neg;

    };

})(jQuery);