Question

我有一个日期输入，由于某种原因，当我尝试在我的范围变量中使用它时，它会变得不确定或“ d-n-u”。以为我有这个输入的监视，并且值不是在那里未定义。我似乎无法使它正常工作

html：

<input type="date" id="date-input2" ng-model="params.schedule" />

javaScript：

$scope.$watch('params.schedule', function (newValue, oldValue) {
//here I am indeed getting Mon Dec 31 2018 00:00:00 GMT+0000 (Western European //Standard Time)
        console.log(newValue);
        console.log($scope.params.schedule);

    }, true);

//但是当我尝试使用它时，它变成undefined ...然后是d-n-u ...，因为它

var scheduledDate = $scope.params.schedule;
$scope.params.schedule = scheduledDate[2] + "- " + scheduledDate[1] + "- " + scheduledDate[0];
$scope.ScheduledDate = scheduledDate.substring(0, 10);

为什么价值在中途丢失？

Answer 1

在$ scope内分配 $scope.params.schedule 的值。$ watch本身而非外部，

$scope.$watch('params.schedule', function (newValue, oldValue) {
//here I am indeed getting Mon Dec 31 2018 00:00:00 GMT+0000 (Western European //Standard Time)
var scheduledDate = $scope.params.schedule;
$scope.params.schedule = scheduledDate[2] + "- " + scheduledDate[1] + "- " + scheduledDate[0];
$scope.ScheduledDate = scheduledDate.substring(0, 10);
}, true);

Answer 2

我认为JS将日期用作字符串：

var scheduledDate = $scope.params.schedule;
// scheduledDate is now equal to the date object "Mon Dec 31 2018 00:00:00 GMT+0000"
$scope.params.schedule = scheduledDate[2] + "- " + scheduledDate[1] + "- " + scheduledDate[0];
// Now $scope.params.schedule is parsed as a string by JS (you can't iterate on a date object) and equal to the 3rd char of the string, dash, 2nd char, dash, 1st char
// So $scope.params.schedule is equal to d- n- u

除非不在应用程序中使用过多日期，否则我建议您使用momentjs或其他库来处理日期。

我无法从日期输入值获取日期到另一个var angularjs

2 个答案: