md-datepicker必须是Date实例错误

Question

I have a problem here. I want to use Angular Material datepicker in my modal form. I simply added it to my form like this

<md-datepicker ng-model="new.warranty" md-placeholder="Enter date"></md-datepicker>

And if I submitting form I got this:

Sun Apr 03 2016 00:00:00 GMT+0300 (EEST)

But I want to convert data in yyyy-MM-dd format before send, so I tried to convert date format in this way

data.warranty = $filter('date')(Date.parse(data.warranty), 'yyyy-MM-dd');

So my form rly send a required yyyy-MM-dd format, but I get an error every time, when I sumbitting form.

`The ng-model for md-datepicker must be a Date instance. Currently the model is a: string`

so, how can I prevent this error, without using moment.js, if it possible, please.

Answer 1

When you use $filter('date') on your data.warranty , you transform it from a Date object to a String , hence the error.

Option 1

The fastest way to solve this is to have a duplicate of your date value as a string:

<md-datepicker ng-model="new.warrantyDate" md-placeholder="Enter date"></md-datepicker>

Whenever you submit the form, before making a request, transform the date in the format you need, but don't overwrite the existing date :

data.warranty = $filter('date')(Date.parse(data.warrantyDate), 'yyyy-MM-dd');

Thus your warrantyDate value will remain a Date object and will continue working. In case you modify the date in your response, do not forget to synchronize the warrantyDate with the modified date.

Option 2

Another option you could try is create a directive that will have different $modelValue and $viewValue for your data.warranty variable. For more information on how you can achieve this, consult the documentation on ngModelController .

The second option requires a deeper understanding of how angular works, so if you're at the very beginning of your angularjs path, you might go well with the first option.

Answer 2

i've solved this issue by overriding md-datepicke ,Here is code

 .directive('mdDatepicker', function ($parse) {

    return {
        require: 'ngModel',
        link: function (scope, elem, attr, ngModel) {
            $parse(attr.ngModel).assign(scope, new Date(_.get(scope, attr.ngModel)));
        }
    }
})