angular directive to format a number in an input

gistfile1.txt

var common = angular.module('common', []);

/** allows numbers to be displayed from a model value with the correct decimal rounding */
common.directive('inputCurrency', function ($filter, $locale) {
    return {
        terminal: true,
        restrict: 'A',        
        require: '?ngModel',
        link: function (scope, element, attrs, ngModel) {

            if (!ngModel)
                return; // do nothing if no ng-model

            // get the number format
            var formats = $locale.NUMBER_FORMATS;

            // construct the currency prefix
            var outer = angular.element('<div />').addClass('input-group');
            var span = angular.element('<span />').addClass('input-group-addon').html(formats.CURRENCY_SYM).appendTo(outer);

            // insert it on the page and add the input to it
            outer.insertBefore(element);
            element.appendTo(outer).addClass('numeric');

            // fix up the incoming number to make sure it will parse into a number correctly
            var fixNumber = function (number) {
                if (number) {
                    if (typeof number !== 'number') {
                        number = number.replace(',', '');
                        number = parseFloat(number);
                    }
                }
                return number;
            }

            // function to do the rounding
            var roundMe = function (number) {
                number = fixNumber(number);
                if (number) {
                    return $filter('number')(number, 2);
                }
            }

            // Listen for change events to enable binding
            element.bind('blur', function () {                                
                element.val(roundMe(ngModel.$modelValue));
            });          

            // push a formatter so the model knows how to render
            ngModel.$formatters.push(function (value) {
                if (value) {
                    return roundMe(value);
                }
            });

            // push a parser to remove any special rendering and make sure the inputted number is rounded
            ngModel.$parsers.push(function (value) {
                if (value) {
                    return fixNumber(roundMe(value));
                }
            });
        }
    };
});