Missed the directive file.

js/directives/keepScrollPos.js

@@ -0,0 +1,28 @@
+// Source: http://stackoverflow.com/a/25073496/1110183
+taskBoardDirectives.directive("keepScrollPos",
+['$route', '$window', '$timeout', '$location', '$anchorScroll',
+function($route, $window, $timeout, $location, $anchorScroll) {
+    // Cache scroll position of each route's templateUrl.
+    var scrollPosCache = {};
+
+    // Compile function
+    return function(scope, element, attrs) {
+        scope.$on('$routeChangeStart', function() {
+            if ($route.current) {
+                scrollPosCache[$route.current.loadedTemplateUrl] = [$window.pageXOffset, $window.pageYOffset];
+            }
+        });
+
+        scope.$on('$routeChangeSuccess', function() {
+            // If hash is specified explicitly, it trumps previously stored scroll position.
+            if ($location.hash()) {
+                $anchorScroll();
+            } else {
+                var prevScrollPos = scrollPosCache[$route.current.loadedTemplateUrl] || [0, 0];
+                $timeout(function() {
+                    $window.scrollTo(prevScrollPos[0], prevScrollPos[1]);
+                }, 0);
+            }
+        });
+    }
+}]);