504     def user_callback(self, cb, args, msg=None, nonify=False):

   505         """register the given user callback and return an url to call it ready to be

   506         inserted in html

   507         """

   508         self._cw.add_js('cubicweb.ajax.js')

   509         if nonify:

   510             _cb = cb

   511             def cb(*args):

   512                 _cb(*args)

   513         cbname = self._cw.register_onetime_callback(cb, *args)

   514         return self.build_js(cbname, xml_escape(msg or ''))

   515 

   516     def build_update_js_call(self, cbname, msg):

   517         rql = self.cw_rset.printable_rql()

   518         return "javascript: %s" % js.userCallbackThenUpdateUI(

   519             cbname, self.__regid__, rql, msg, self.__registry__, self.domid)

   520 

   521     def build_reload_js_call(self, cbname, msg):

   522         return "javascript: %s" % js.userCallbackThenReloadPage(cbname, msg)

   523 

   524     build_js = build_update_js_call # expect updatable component by default

   525