Angular Js：类属性指令中的 onchange 不起作用

控制指令.js

  function validVehicleyear($scope, $http) {
        return {
            restrict: 'C',
            scope: {
                ngModel: '=',                
            },
            link: function (scope, element, attrs, ngModel) {
                element.bind('change', function () {
                    console.log('here in validVehicleyear');
                    $http.get('api.php/'+scope.ngModel)
                            .then(function (response) {
                                $scope.answers.VehicleMake = response.data;
                            });
                });
            }
        }
    }

plnkr.co/edit/BFGXr7LNAe0KvQipj9JJ?p=预览 http://plnkr.co/edit/BFGXr7LNAe0KvQipj9JJ?p=preview

我在车辆年份问题的课堂上写了一条指令 validVehicleyear，我想调用年份更改并为车辆制造商设置新选项，但它不起作用。

Class="form-control **valid-vehicleyear** ng-not-empty ng-dirty ng-valid-parse ng-valid ng-valid-required ng-touched"

你忘记声明你的指令函数

.directive('validVehicleyear', validVehicleyear)

http://plnkr.co/edit/9bGXO96s0BJVik7VecFU?p=preview http://plnkr.co/edit/9bGXO96s0BJVik7VecFU?p=preview