closes #4612

public/src/client/topic/posts.js

@@ -32,6 +32,7 @@ define('forum/topic/posts', [
 		});
 
 		updatePostCounts(data.posts);
+
 		ajaxify.data.postcount ++;
 		postTools.updatePostCount(ajaxify.data.postcount);
 
@@ -60,15 +61,26 @@ define('forum/topic/posts', [
 		ajaxify.data.pagination.pageCount = Math.max(1, Math.ceil((posts[0].topic.postcount - 1) / config.postsPerPage));
 		var direction = config.topicPostSort === 'oldest_to_newest' || config.topicPostSort === 'most_votes' ? 1 : -1;
 
-		var isPostVisible = (ajaxify.data.pagination.currentPage === ajaxify.data.pagination.pageCount && direction === 1) || (ajaxify.data.pagination.currentPage === 1 && direction === -1);
+		var isPostVisible = (ajaxify.data.pagination.currentPage === ajaxify.data.pagination.pageCount && direction === 1) ||
+							(ajaxify.data.pagination.currentPage === 1 && direction === -1);
 
 		if (isPostVisible) {
 			createNewPosts(data, components.get('post').not('[data-index=0]'), direction, scrollToPost);
 		} else if (ajaxify.data.scrollToMyPost && parseInt(posts[0].uid, 10) === parseInt(app.user.uid, 10)) {
 			pagination.loadPage(ajaxify.data.pagination.pageCount, scrollToPost);
+		} else {
+			updatePagination();
 		}
 	}
 
+	function updatePagination() {
+		$.get(config.relative_path + '/api/topic/pagination/' + ajaxify.data.tid, {page: ajaxify.data.pagination.currentPage}, function(paginationData) {
+			app.parseAndTranslate('partials/paginator', {pagination: paginationData}, function(html) {
+				$('[component="pagination"]').after(html).remove();
+			});
+		});
+	}
+
 	function onNewPostInfiniteScroll(data) {
 		var direction = config.topicPostSort === 'oldest_to_newest' || config.topicPostSort === 'most_votes' ? 1 : -1;
 

src/controllers/topics.js

@@ -327,5 +327,37 @@ topicsController.teaser = function(req, res, next) {
 	});
 };
 
+topicsController.pagination = function(req, res, callback) {
+	var tid = req.params.topic_id;
+	var currentPage = parseInt(req.query.page, 10) || 1;
+
+	if (!utils.isNumber(tid)) {
+		return callback();
+	}
+
+	async.parallel({
+		privileges: async.apply(privileges.topics.get, tid, req.uid),
+		settings: async.apply(user.getSettings, req.uid),
+		topic: async.apply(topics.getTopicData, tid)
+	}, function (err, results) {
+		if (err || !results.topic) {
+			return callback(err);
+		}
+
+		if (!results.privileges.read || (parseInt(results.topic.deleted, 10) && !results.privileges.view_deleted)) {
+			return helpers.notAllowed(req, res);
+		}
+
+		var postCount = parseInt(results.topic.postcount, 10);
+		var pageCount = Math.max(1, Math.ceil((postCount - 1) / results.settings.postsPerPage));
+
+		var paginationData = pagination.create(currentPage, pageCount);
+		paginationData.rel.forEach(function(rel) {
+			rel.href = nconf.get('url') + '/topic/' + results.topic.slug + rel.href;
+		});
+
+		res.json(paginationData);
+	});
+};
 
 module.exports = topicsController;

src/routes/api.js

@@ -24,6 +24,7 @@ module.exports =  function(app, middleware, controllers) {
 	router.get('/recent/posts/:term?', controllers.api.getRecentPosts);
 	router.get('/unread/:filter?/total', middleware.authenticate, controllers.unread.unreadTotal);
 	router.get('/topic/teaser/:topic_id', controllers.topics.teaser);
+	router.get('/topic/pagination/:topic_id', controllers.topics.pagination);
 
 	var multipart = require('connect-multiparty');
 	var multipartMiddleware = multipart();