Angular中的Money格式指令

Question

我需要一个过滤货币字段的指令,因此用户只需要输入并隐含小数.

需求:

1. 格式十进制字段作为用户类型 -

用户输入时从百分位开始.所以他们输入"4"并看"0.04",输入"42"并看"0.42",输入298023并看"2980.23"

2. 字段必须是数字
3. 必须允许负面 -
4. 允许0.00作为数字输入
5. 理想情况下,使用type ="number",但"type = text"是可以的
6. 您应该能够清除该字段为空.

ng-currency过滤器不能满足这些要求.请看看掠夺者的行为,看看我的意思.

我的First Plunker有`input = text'并允许负数.一个问题是你不能输入负数作为第一个数字.清除该字段后,它将返回"0.00",但应该完全清除.

   app.directive('format', ['$filter', function ($filter) {
 return {
            require: 'ngModel', //there must be ng-model in the html
            link: function (scope, elem, attr, ctrl) {
                if (!ctrl) return;

                ctrl.$parsers.unshift(function (viewValue, modelValue) {
                    var plainNumber = viewValue.replace(/[^-+0-9]/g,'');
                    var newVal = plainNumber.charAt(plainNumber.length-1);
                    var positive = plainNumber.charAt(0) != '-';
                    if(isNaN(plainNumber.charAt(plainNumber.length-1))){
                      plainNumber = plainNumber.substr(0,plainNumber.length-1)
                    }
                    //use angular internal 'number' filter
                    plainNumber = $filter('number')(plainNumber / 100, 2).replace(/,/g, '');
                    if(positive && newVal == '-'){
                      plainNumber = '-' + plainNumber;
                    }
                    else if(!positive && newVal == '+'){
                      plainNumber = plainNumber.substr(1);
                    }
                    plainNumber.replace('.', ',');

                    //update the $viewValue
                    ctrl.$setViewValue(plainNumber);
                    //reflect on the DOM element
                    ctrl.$render();
                    //return the modified value to next parser
                    return plainNumber;
                });
            }
        };

}]);

我的第二个Plunker有input = text并允许负输入.与第一个plunker一样,只有在键入数字后才会允许负数作为第一个字符.第二是它从十分之一开始而不是百分之一.(如果你输入'3',你应该看到'0.03',但这里显示'0.3')

app.directive('inputRestrictor', [function() {
    return {
        restrict: 'A',
        require: 'ngModel',
        link: function(scope, element, attr, ngModelCtrl) {
            var pattern = /[^.0-9+-]/g;

            function fromUser(text) {
                if (!text)
                return text;

                var rep = /[+]/g;
                var rem = /[-]/g;
                rep.exec(text);
                rem.exec(text);

                var indexp = rep.lastIndex;
                var indexm = rem.lastIndex;
                text = text.replace(/[+.-]/g, '');
                if (indexp > 0 || indexm > 0) {
                    if (indexp > indexm) text = "+" + text; // plus sign?
                    else text = "-" + text;
                }

                var transformedInput = text.replace(pattern, '');
                transformedInput = transformedInput.replace(/([0-9]{1,2}$)/, ".$1")
                ngModelCtrl.$setViewValue(transformedInput);
                ngModelCtrl.$render();
                return transformedInput;
            }

            ngModelCtrl.$parsers.push(fromUser);
        }
    };
}]);

我如何协调这些解决方案或定制一个以满足要求？我想避免额外的库或附加组件.有人告诉我,最好的办法是研究货币过滤器的来源,然后用额外的要求重新创建过滤器.我很乐意这样做,但我现在真的没有这方面的技能.这两个指令就是我所拥有的.

Answer 1

.::更新的答案 - 7月14日::.

检查这个简单的指令:

app.directive('price', [function () {
    return {
        require: 'ngModel',
        link: function (scope, element, attrs, ngModel) {
            attrs.$set('ngTrim', "false");

            var formatter = function(str, isNum) {
                str = String( Number(str || 0) / (isNum?1:100) );
                str = (str=='0'?'0.0':str).split('.');
                str[1] = str[1] || '0';
                return str[0].replace(/(\d)(?=(\d\d\d)+(?!\d))/g, '$1,') + '.' + (str[1].length==1?str[1]+'0':str[1]);
            }
            var updateView = function(val) {
                scope.$applyAsync(function () {
                    ngModel.$setViewValue(val || '');
                    ngModel.$render();
                });
            }
            var parseNumber = function(val) {
                var modelString = formatter(ngModel.$modelValue, true);
                var sign = {
                    pos: /[+]/.test(val),
                    neg: /[-]/.test(val)
                }
                sign.has = sign.pos || sign.neg;
                sign.both = sign.pos && sign.neg;

                if (!val || sign.has && val.length==1 || ngModel.$modelValue && Number(val)===0) {
                    var newVal = (!val || ngModel.$modelValue && Number()===0?'':val);
                    if (ngModel.$modelValue !== newVal)
                        updateView(newVal);

                    return '';
                }
                else {
                    var valString = String(val || '');
                    var newSign = (sign.both && ngModel.$modelValue>=0 || !sign.both && sign.neg?'-':'');
                    var newVal = valString.replace(/[^0-9]/g,'');
                    var viewVal = newSign + formatter(angular.copy(newVal));

                    if (modelString !== valString)
                        updateView(viewVal);

                    return (Number(newSign + newVal) / 100) || 0;
                }
            }
            var formatNumber = function(val) {
                if (val) {
                    var str = String(val).split('.');
                    str[1] = str[1] || '0';
                    val = str[0] + '.' + (str[1].length==1?str[1]+'0':str[1]);
                }
                return parseNumber(val);
            }

            ngModel.$parsers.push(parseNumber);
            ngModel.$formatters.push(formatNumber);
        }
    };
}]);

并像这样使用它:

<input type="text" ng-model="number" price >

在这个PLUNKER(7月14日)看到它