how to validate the field in mvc before ajax call

1BY LOVE
2NOTE : In case of AJAX call on button
3
4•	If HTML input type is Submit for the button, then Success event is not calling successfully. If Input type is button then Success event called successfully. 
5•	Just remove type="submit" from your button and let your jQuery ajax call be triggered first. Once you get the response then you can submit your form as well.
6
7$('#btnCreateLocation').click(function (e)
8    {
9        var _this = $(this);
10        var _form = _this.closest("form");
11        if (!$(_form).data('unobtrusiveValidation').validate()) {
12            alert('NOT valid');
13        }
14        else {
15            alert('valid');
16            $('form').submit();
17        }
18        
19    });