Show allert in sort template if agenda sort request failed.

openslides/agenda/static/js/agenda/site.js

@@ -585,6 +585,7 @@ angular.module('OpenSlidesApp.agenda.site', [
             $scope.items = AgendaTree.getTree(Agenda.getAll());
         });
         $scope.showInternalItems = true;
+        $scope.alert = {};
 
         // save parent and weight of moved agenda item (and all items on same level)
         $scope.treeOptions = {
@@ -594,7 +595,15 @@ angular.module('OpenSlidesApp.agenda.site', [
                 if (event.dest.nodesScope.item) {
                     parentID = event.dest.nodesScope.item.id;
                 }
-                $http.post('/rest/agenda/item/sort/', {nodes: event.dest.nodesScope.$modelValue, parent_id: parentID});
+                $http.post('/rest/agenda/item/sort/', {
+                    nodes: event.dest.nodesScope.$modelValue,
+                    parent_id: parentID}
+                ).then(
+                    function(success) {},
+                    function(error){
+                        $scope.alert = {type: 'danger', msg: error.data.detail, show: true};
+                    }
+                );
             }
         };
     }

openslides/agenda/static/templates/agenda/item-sort.html

@@ -19,6 +19,10 @@
       <translate ng-if="!showInternalItems">Show internal items</translate>
     </button>
 
+  <div uib-alert ng-show="alert.show" ng-class="'alert-' + (alert.type || 'warning')" ng-click="alert={}" close="alert={}">
+    {{ alert.msg }}
+  </div>
+
   <div ui-tree="treeOptions" id="tree-root">
     <ol ui-tree-nodes ng-model="items">
       <li ng-repeat="item in items" ui-tree-node ng-include="'nodes_renderer.html'">