js

$("#subscribeForm").on("submit", function (event) {
  event.preventDefault();
  let email = $('#id_email').val();
  let csrfToken = $("[name=csrfmiddlewaretoken]").val();
  const requestUrl = window.location.origin + $(this).attr('action');
  $.ajax({
    url: requestUrl,
    type: "POST",
    data: { 'email': email, 'csrfmiddlewaretoken' : csrfToken, },
    success: function (data) {
      $("#subscribeFormResponse").html(data);
      $('#id_email').val('');
    },
    error: function (xhr, errmsg, err) {
      // console.log(xhr, errmsg, err);
      $('#id_email').val('');
    }
  });
});

py

class SubscribeCreateView(CreateView):
    template_name = 'femigrants/index.html'
    form_class = SubscribeForm
    http_method_names = ('post', )
    ajax_template = 'partials/subscribe-response.html'

    def post(self, request, *args, **kwargs):
        if request.is_ajax():
            form = SubscribeForm(request.POST)
            if form.is_valid():
                form_response = "Thank you for subscribing."
                form.save()
            else:
                form_response = ' '.join(form.errors['email'])
            return render(request, self.ajax_template, {"subscribeFormResponse": form_response, })
        else:
            return super(SubscribeCreateView,self).post(request, *args, **kwargs)