+<%
+=begin
+
+Parameters received from the caller/requestor of the modal are
+attached to the action button (.btn-primary) as follows:
+
+action_class -- string -- added as a pseudoclass to the action button.
+
+action_href -- string -- will be available at $(btn).attr('data-action-href')
+
+action_data -- json-encoded object -- will be at $(btn).data('action-data')
+
+action_data_form_params -- array -- for each X in this array, the
+value of params[X] during this "show chooser" request will be in
+$(btn).data('action-data-from-params')[X].
+
+=end
+%>
+