Added fancy error message if ski-lift gets disabled.

dav_events/templates/dav_events/base.html

@@ -44,6 +44,8 @@
     </div>
 
     <div id="page-body">
+        {% block modals %}
+        {% endblock modals %}
 	    {% block page-body %}
         <div class="container-fluid">
             {% block page-container-fluid %}

dav_events/templates/dav_events/event_create/ModeForm.html

@@ -18,6 +18,9 @@
             if(sport == "S") {
                 e.prop("disabled", false);
             } else {
+                if(e.prop("checked"))
+                    $("#skilift-alert").modal('show');
+                e.prop("checked", false);
                 e.prop("disabled", true);
             }
         }
@@ -30,6 +33,17 @@
 </script>
 {% endblock head-additional %}
 
+{% block modals %}
+<div id="skilift-alert" class="modal fade" tabindex="-1" role="dialog">
+    <div class="modal-dialog" role="document">
+        <div class="alert alert-danger alert-dismissible" role="alert">
+            <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
+            Das Feld Skiliftbenutzung kann nur bei Ski-Veranstaltungen ausgewählt werdent!
+        </div>
+    </div>
+</div>
+{% endblock modals %}
+
 {% block form-fields-visible %}
 <div class="row">
     <div class="col-sm-4">