// view
class UpdatePasswordView(LoginRequiredMixin, View):
    def post(self, *args, **kwargs):
        current_user = User.objects.get(id=self.request.user.id)
        oldpassword = self.request.POST.get('oldpassword')
        newpassword1 = self.request.POST.get('newpassword1')
        newpassword2 = self.request.POST.get('newpassword2')
        user = authenticate(email=current_user.email, password=oldpassword)

        if user is not None:
            if newpassword1 == newpassword2 and newpassword1 != '' and newpassword1 != oldpassword:
                u = User.objects.get(id=current_user.id)
                u.set_password(newpassword1)
                u.save()
                message = 'Success'
                status = 'OK'
                update_session_auth_hash(self.request, u)
            else:
                message = '*Error'
                status = 'ERROR'
        else:
            message = '*Error'
            status = 'ERROR'
        context_dict = {
            'status': status,
            'message': message
        }
        return JsonResponse(context_dict, status=200)

//JS

function savePassword(){
    url = "change_password/",
        $.ajax({
            url: url,
            type: "POST",
            data: {
                'oldpassword': $("#oldpassword").val(),
                'newpassword1': $("#newpassword1").val(),
                'newpassword2': $("#newpassword2").val()
            },
            success: function (data) {
                console.log(data['message'])
                if (data['status'] == 'OK') {
                    $('#form-message').removeClass('text-danger');
                    $('#form-message').html(data['message']);
                    $('#form-message').addClass('text-success');
                } else {
                    $('#form-message').removeClass('text-success');
                    $('#form-message').html(data['message']);
                    $('#form-message').addClass('text-danger');
                }
            },
            error: function (error) {
                console.log(error);
            }
        });
}