diff --git a/web/gui/src/main/webapp/app/directives.js b/web/gui/src/main/webapp/app/directives.js
new file mode 100644
index 0000000..2cb6dc1
--- /dev/null
+++ b/web/gui/src/main/webapp/app/directives.js
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ ONOS GUI -- Our own Angular directives defined here.
+
+ @author Simon Hunt
+ */
+
+(function () {
+    'use strict';
+
+    angular.module('onosApp')
+
+        // Create a resize directive, that we can apply to elements
+        // so that they can respond to window resize events.
+        .directive('resize', ['$window', function ($window) {
+            return function (scope, element, attrs) {
+                var w = angular.element($window);
+                scope.$watch(function () {
+                    return {
+                        h: window.innerHeight,
+                        w: window.innerWidth
+                    };
+                }, function (newVal, oldVal) {
+                    scope.windowHeight = newVal.h;
+                    scope.windowWidth = newVal.w;
+
+                    scope.resizeWithOffset = function (offH, offW) {
+                        var oh = offH || 0,
+                            ow = offW || 0;
+                        scope.$eval(attrs.notifier);
+                        return {
+                            height: (newVal.h - oh) + 'px',
+                            width: (newVal.w - ow) + 'px'
+                        };
+                    };
+                }, true);
+
+                w.bind('resize', function () {
+                    scope.$apply();
+                });
+            };
+        }])
+
+}());