如果稍后更改值，则最小/最大验证不起作用

问题描述

我有一个要求，其中一个字段的最小值取决于另一个字段中给出的输入.

i have requirement where min value of one field depends on the input given in another field.

<input type="number" name="minval" class="form-control" ng-model="user.minval"
      ng-required="true">

此输入用于验证另一个字段

this input is used to validate another field

<input type="number" name="inputval" class="form-control" ng-model="user.inputval"
     ng-required="true" min="{{user.minval}}">

但这不能按预期工作..如果我稍后更改minval"，则输入不会重新验证..

but this is not working as expected.. if i change the "minval" later the input does not get revalidated..

我已经尝试按照某些解决方案中的建议从 JS 设置 min 的初始值，但这也无济于事...

i have tried setting the initial value for min from JS as was suggested in some solution but thats also not helping...

PLUNKER 链接

推荐答案

使用 ng-min/ng-max 指令

use ng-min/ng-max directives

app.directive('ngMin', function() {
    return {
        restrict: 'A',
        require: 'ngModel',
        link: function(scope, elem, attr, ctrl) {
            scope.$watch(attr.ngMin, function(){
                if (ctrl.$isDirty) ctrl.$setViewValue(ctrl.$viewValue);
            });

            var isEmpty = function (value) {
               return angular.isUndefined(value) || value === "" || value === null;
            }

            var minValidator = function(value) {
              var min = scope.$eval(attr.ngMin) || 0;
              if (!isEmpty(value) && value < min) {
                ctrl.$setValidity('ngMin', false);
                return undefined;
              } else {
                ctrl.$setValidity('ngMin', true);
                return value;
              }
            };

            ctrl.$parsers.push(minValidator);
            ctrl.$formatters.push(minValidator);
        }
    };
});

app.directive('ngMax', function() {
    return {
        restrict: 'A',
        require: 'ngModel',
        link: function(scope, elem, attr, ctrl) {
            scope.$watch(attr.ngMax, function(){
                if (ctrl.$isDirty) ctrl.$setViewValue(ctrl.$viewValue);
            });
            var maxValidator = function(value) {
              var max = scope.$eval(attr.ngMax) || Infinity;
              if (!isEmpty(value) && value > max) {
                ctrl.$setValidity('ngMax', false);
                return undefined;
              } else {
                ctrl.$setValidity('ngMax', true);
                return value;
              }
            };

            ctrl.$parsers.push(maxValidator);
            ctrl.$formatters.push(maxValidator);
        }
    };
});

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