app.directive('datePicker', function () {    return {        restrict: 'A',        require: 'ngModel',        scope: {            minDate: '@',        },        link: function (scope, element, attr, ngModel) {            element.val(ngModel.$viewValue);            function onpicking(dp) {                var date = dp.cal.getNewDateStr();                scope.$apply(function () {                    ngModel.$setViewValue(date);                });            }            element.bind('click', function () {                WdatePicker({                    onpicking: onpicking,                    dateFmt: 'yyyy-MM-dd',                    minDate: (scope.minDate || '%y-%M-%d'),                })            });        }    };});