Added infinite scrolling. It's sliiiightly buggy in that it jumps down the list a bit, but it is overall working pretty well. Added ng-infinite-scroll-matrix.js and jquery-1.8.3 as deps.

webclient/app.js

@@ -22,7 +22,8 @@ var matrixWebClient = angular.module('matrixWebClient', [
     'RoomsController',
     'matrixService',
     'eventStreamService',
-    'eventHandlerService'
+    'eventHandlerService',
+    'infinite-scroll'
 ]);
 
 matrixWebClient.config(['$routeProvider', '$provide', '$httpProvider',

webclient/index.html

@@ -6,8 +6,10 @@
     <link rel="stylesheet" href="app.css">
     <link rel="icon" href="favicon.ico">
    
+    <script type='text/javascript' src='js/jquery-1.8.3.min.js'></script> 
     <script src="js/angular.js"></script>
     <script src="js/angular-route.js"></script>
+    <script type='text/javascript' src='js/ng-infinite-scroll-matrix.js'></script>
     <script src="app.js"></script>
     <script src="app-controller.js"></script>
     <script src="login/login-controller.js"></script>

webclient/js/ng-infinite-scroll-matrix.js

@@ -0,0 +1,63 @@
+/* ng-infinite-scroll - v1.0.0 - 2013-02-23 
+  Matrix: Modified to support scrolling UP to get infinite loading and to listen
+  to scroll events on the PARENT element, not the window.
+*/
+var mod;
+
+mod = angular.module('infinite-scroll', []);
+
+mod.directive('infiniteScroll', [
+  '$rootScope', '$window', '$timeout', function($rootScope, $window, $timeout) {
+    return {
+      link: function(scope, elem, attrs) {
+        var checkWhenEnabled, handler, scrollDistance, scrollEnabled;
+        $window = angular.element($window);
+        scrollDistance = 0;
+        if (attrs.infiniteScrollDistance != null) {
+          scope.$watch(attrs.infiniteScrollDistance, function(value) {
+            return scrollDistance = parseInt(value, 10);
+          });
+        }
+        scrollEnabled = true;
+        checkWhenEnabled = false;
+        if (attrs.infiniteScrollDisabled != null) {
+          scope.$watch(attrs.infiniteScrollDisabled, function(value) {
+            scrollEnabled = !value;
+            if (scrollEnabled && checkWhenEnabled) {
+              checkWhenEnabled = false;
+              return handler();
+            }
+          });
+        }
+        handler = function() {
+          var elementTop, remaining, shouldScroll, windowTop;
+          windowTop = 0;
+          elementTop = elem.offset().top;
+          shouldScroll = elementTop >= 0; // top of list is at the top of the window or further down the page
+          if (shouldScroll && scrollEnabled) {
+            if ($rootScope.$$phase) {
+              return scope.$eval(attrs.infiniteScroll);
+            } else {
+              return scope.$apply(attrs.infiniteScroll);
+            }
+          } else if (shouldScroll) {
+            return checkWhenEnabled = true;
+          }
+        };
+        elem.parent().on('scroll', handler);
+        scope.$on('$destroy', function() {
+          return elem.parent().off('scroll', handler);
+        });
+        return $timeout((function() {
+          if (attrs.infiniteScrollImmediateCheck) {
+            if (scope.$eval(attrs.infiniteScrollImmediateCheck)) {
+              return handler();
+            }
+          } else {
+            return handler();
+          }
+        }), 0);
+      }
+    };
+  }
+]);

webclient/room/room-controller.js

@@ -15,6 +15,32 @@ limitations under the License.
 */
 
 angular.module('RoomController', [])
+// FIXME move directives outta here!
+.directive("keepScroll", function(){
+  return {
+    controller : function($scope){
+      var element = 0;
+      this.setElement = function(el){
+        element = el;
+      }
+      this.addItem = function(item){
+        element.scrollTop = (element.scrollTop+item.clientHeight+1); //1px for margin
+      };
+    },
+    link : function(scope,el,attr, ctrl) {
+     ctrl.setElement(el[0]);
+    }
+  };
+})
+// FIXME move directives outta here!
+.directive("scrollItem", function(){
+  return{
+    require : "^keepScroll",
+    link : function(scope, el, att, scrCtrl){
+      scrCtrl.addItem(el[0]);
+    }
+  }
+})
 .controller('RoomController', ['$scope', '$http', '$timeout', '$routeParams', '$location', 'matrixService', 'eventStreamService', 'eventHandlerService',
                                function($scope, $http, $timeout, $routeParams, $location, matrixService, eventStreamService, eventHandlerService) {
    'use strict';
@@ -54,7 +80,14 @@ angular.module('RoomController', [])
         updatePresence(event);
     });
     
-    var paginate = function(numItems) {
+    $scope.paginateMore = function() {
+        if ($scope.state.can_paginate) {
+            console.log("Paginating more.");
+            paginate(MESSAGES_PER_PAGINATION, false);
+        }
+    };
+    
+    var paginate = function(numItems, toBottom) {
         matrixService.paginateBackMessages($scope.room_id, $scope.state.earliest_token, numItems).then(
             function(response) {
                 eventHandlerService.handleEvents(response.data.chunk, false);
@@ -63,6 +96,11 @@ angular.module('RoomController', [])
                     // no more messages to paginate :(
                     $scope.state.can_paginate = false;
                 }
+                
+                if (toBottom) {
+                    console.log("Scrolling to bottom");
+                    scrollToBottom();
+                }
             },
             function(error) {
                 console.log("Failed to paginateBackMessages: " + JSON.stringify(error));
@@ -181,7 +219,7 @@ angular.module('RoomController', [])
                     }
                 );
                 
-                paginate(MESSAGES_PER_PAGINATION);
+                paginate(MESSAGES_PER_PAGINATION, true);
             },
             function(reason) {
                 $scope.feedback = "Can't join room: " + reason;
@@ -223,6 +261,6 @@ angular.module('RoomController', [])
     };
     
     $scope.loadMoreHistory = function() {
-        paginate(MESSAGES_PER_PAGINATION);
+        paginate(MESSAGES_PER_PAGINATION, false);
     };
 }]);

webclient/room/room.html

@@ -20,9 +20,9 @@
         </table>
     </div>
     
-    <div class="messageTableWrapper">
-        <table class="messageTable">
-            <tr ng-repeat="msg in events.rooms[room_id].messages" ng-class="msg.user_id === state.user_id ? 'mine' : ''">
+    <div class="messageTableWrapper" keep-scroll>
+        <table class="messageTable" infinite-scroll="paginateMore()">
+            <tr ng-repeat="msg in events.rooms[room_id].messages" ng-class="msg.user_id === state.user_id ? 'mine' : ''" scroll-item>
                 <td class="leftBlock">
                     <div class="sender" ng-hide="events.rooms[room_id].messages[$index - 1].user_id === msg.user_id">{{ members[msg.user_id].displayname || msg.user_id }}</div>
                     <div class="timestamp">{{ msg.content.hsob_ts | date:'MMM d HH:mm:ss' }}</div>

webclient/rooms/rooms.html

@@ -86,7 +86,7 @@
     </div>
     <div>
         <form>
-            <input size="40" ng-model="joinAlias.room_alias" ng-enter="joinAlias(joinAlias.room_alias)" placeholder="(e.g. #foo_channe:example.org)"/>
+            <input size="40" ng-model="joinAlias.room_alias" ng-enter="joinAlias(joinAlias.room_alias)" placeholder="(e.g. #foo_channel:example.org)"/>
             <button ng-disabled="!joinAlias.room_alias" ng-click="joinAlias(joinAlias.room_alias)">Join room</button>    
         </form>
     </div>