stores the user's bookmark on the server

public/src/client/topic.js

@@ -197,10 +197,19 @@ define('forum/topic', [
 			}
 		}
 
-		var currentBookmark = localStorage.getItem('topic:' + ajaxify.data.tid + ':bookmark');
-
-		if (!currentBookmark || parseInt(postIndex, 10) >= parseInt(currentBookmark, 10)) {
-			localStorage.setItem('topic:' + ajaxify.data.tid + ':bookmark', postIndex);
+		var bookmarkKey = 'topic:' + ajaxify.data.tid + ':bookmark';
+		var currentBookmark = localStorage.getItem(bookmarkKey);
+
+		if (!currentBookmark || parseInt(postIndex, 10) > parseInt(currentBookmark, 10)) {
+			localStorage.setItem(bookmarkKey, postIndex);
+			if (app.user.uid) {
+				var data = {
+					'tid':  ajaxify.data.tid,
+					'uid': app.user.uid,
+					'postIndex': postIndex
+				}
+				socket.emit('topics.bookmark', data);
+			}
 			app.removeAlert('bookmark');
 		}
 

src/socket.io/topics.js

@@ -96,6 +96,11 @@ SocketTopics.postcount = function(socket, tid, callback) {
 	topics.getTopicField(tid, 'postcount', callback);
 };
 
+SocketTopics.bookmark = function(socket, data, callback) {
+	// data contains tid, uid, and postIndex
+	topics.setUserBookmark(data, callback);
+}
+
 SocketTopics.markAsRead = function(socket, tids, callback) {
 	if(!Array.isArray(tids) || !socket.uid) {
 		return callback(new Error('[[error:invalid-data]]'));

src/topics.js

@@ -327,6 +327,14 @@ var async = require('async'),
 		});
 	}
 
+	Topics.getUserBookmark = function (tid, uid, callback) {
+		Topics.getTopicField(tid + ':bookmarks', uid, callback);
+	}
+
+	Topics.setUserBookmark = function(data, callback) {
+		Topics.setTopicField(data.tid + ':bookmarks', data.uid, data.postIndex, callback);
+	}
+
 	Topics.getTopicField = function(tid, field, callback) {
 		db.getObjectField('topic:' + tid, field, callback);
 	};