code: def get_form_success_data(self, form):
          
          data = {
              "html": render_to_string(
                  "pinax/teams/_invite_form.html",
                  {
                      "invite_form": self.get_unbound_form(),
                      "team": self.team
                  },
                  request=self.request
              )
          }
  
          membership = self.membership
          if membership is not None:
              if membership.state == Membership.STATE_APPLIED:
                  fragment_class = ".applicants"
              elif membership.state == Membership.STATE_INVITED:
                  fragment_class = ".invitees"
              elif membership.state in (Membership.STATE_AUTO_JOINED, Membership.STATE_ACCEPTED):
                  fragment_class = {
                      Membership.ROLE_OWNER: ".owners",
                      Membership.ROLE_MANAGER: ".managers",
                      Membership.ROLE_MEMBER: ".members"
                  }[membership.role]
              data.update({
                  "append-fragments": {
                      fragment_class: render_to_string(
                          "pinax/teams/_membership.html",
                          {
                              "membership": membership,
                              "team": self.team
                          },
                          request=self.request
                      )
                  }
              })
          return data
docs: Allows customization of the JSON data returned when a valid form submission occurs.