closes #1758

public/src/forum/category.js

@@ -35,7 +35,7 @@ define('forum/category', ['composer', 'forum/pagination', 'forum/infinitescroll'
 		enableInfiniteLoadingOrPagination();
 
 		if (!config.usePagination) {
-			navigator.init('#topics-container > .category-item', ajaxify.variables.get('topic_count'));
+			navigator.init('#topics-container > .category-item', ajaxify.variables.get('topic_count'), undefined, Category.toTop, Category.toBottom);
 		}
 
 		$('#topics-container').on('click', '.topic-title', function() {
@@ -50,6 +50,16 @@ define('forum/category', ['composer', 'forum/pagination', 'forum/infinitescroll'
 		});
 	};
 
+	Category.toTop = function() {
+		navigator.scrollTop(0);
+	};
+
+	Category.toBottom = function() {
+		socket.emit('categories.lastTopicIndex', ajaxify.variables.get('category_id'), function(err, index) {
+			navigator.scrollBottom(index);
+		});
+	};
+
 	$(window).on('action:popstate', function(ev, data) {
 		if(data.url.indexOf('category/') === 0) {
 			var bookmark = localStorage.getItem('category:bookmark');

public/src/forum/topic.js

@@ -62,7 +62,7 @@ define('forum/topic', dependencies, function(pagination, infinitescroll, threadT
 
 		handleBookmark(tid);
 
-		navigator.init('.posts > .post-row', postCount, Topic.navigatorCallback);
+		navigator.init('.posts > .post-row', postCount, Topic.navigatorCallback, Topic.toTop, Topic.toBottom);
 
 		socket.on('event:new_post', onNewPost);
 
@@ -74,6 +74,16 @@ define('forum/topic', dependencies, function(pagination, infinitescroll, threadT
 		socket.emit('topics.increaseViewCount', tid);
 	};
 
+	Topic.toTop = function() {
+		navigator.scrollTop(1);
+	};
+
+	Topic.toBottom = function() {
+		socket.emit('topics.lastPostIndex', ajaxify.variables.get('topic_id'), function(err, index) {
+			navigator.scrollBottom(index);
+		});
+	};
+
 	function handleBookmark(tid) {
 		var bookmark = localStorage.getItem('topic:' + tid + ':bookmark');
 		var postIndex = getPostIndex();

public/src/modules/navigator.js

@@ -10,10 +10,12 @@ define('navigator', function() {
 	var index = 1;
 	var count = 0;
 
-	navigator.init = function(selector, count, callback) {
+	navigator.init = function(selector, count, callback, toTop, toBottom) {
 
 		navigator.selector = selector;
 		navigator.callback = callback;
+		toTop = toTop || function() {};
+		toBottom = toBottom || function() {};
 
 		$(window).on('scroll', navigator.update);
 
@@ -21,21 +23,10 @@ define('navigator', function() {
 			e.stopPropagation();
 		});
 
-		$('.pagination-block .pageup').off('click').on('click', function() {
+		$('.pagination-block .pageup').off('click').on('click', navigator.scrollUp);
-			navigator.scrollToTop();
+		$('.pagination-block .pagedown').off('click').on('click', navigator.scrollDown);
-		});
+		$('.pagination-block .pagetop').off('click').on('click', toTop);
-
+		$('.pagination-block .pagebottom').off('click').on('click', toBottom);
-		$('.pagination-block .pagedown').off('click').on('click', function() {
-			navigator.scrollToBottom();
-		});
-
-		$('.pagination-block .pagetop').off('click').on('click', function() {
-			ajaxify.go(generateUrl());
-		});
-
-		$('.pagination-block .pagebottom').off('click').on('click', function() {
-			ajaxify.go(generateUrl(count));
-		});
 
 		$('.pagination-block input').on('keydown', function(e) {
 			if (e.which === 13) {
@@ -107,18 +98,35 @@ define('navigator', function() {
 		$('.pagination-block .progress-bar').width((index / count * 100) + '%');
 	};
 
-	navigator.scrollToTop = function () {
+	navigator.scrollUp = function () {
 		$('body,html').animate({
 			scrollTop: 0
 		});
 	};
 
-	navigator.scrollToBottom = function () {
+	navigator.scrollDown = function () {
 		$('body,html').animate({
 			scrollTop: $('html').height() - 100
 		});
 	};
 
+	navigator.scrollTop = function(index) {
+		if ($('li[data-index="' + index + '"]').length) {
+			navigator.scrollUp();
+		} else {
+			ajaxify.go(generateUrl());
+		}
+	};
+
+	navigator.scrollBottom = function(index) {
+		if ($('li[data-index="' + index + '"]').length) {
+			navigator.scrollDown();
+		} else {
+			index = parseInt(index, 10) + 1;
+			ajaxify.go(generateUrl(index));
+		}
+	};
+
 	function elementInView(el) {
 		var scrollTop = $(window).scrollTop() + $('#header-menu').height();
 		var scrollBottom = scrollTop + $(window).height();

src/middleware/middleware.js

@@ -100,7 +100,7 @@ middleware.checkPostIndex = function(req, res, next) {
 };
 
 middleware.checkTopicIndex = function(req, res, next) {
-	categories.getCategoryField(req.params.category_id, 'topic_count', function(err, topicCount) {
+	db.sortedSetCard('categories:' + req.params.category_id + ':tid', function(err, topicCount) {
 		if (err) {
 			return next(err);
 		}

src/socket.io/categories.js

@@ -1,10 +1,11 @@
 'use strict';
 
 var	async = require('async'),
+	db = require('../database'),
 	categories = require('../categories'),
 	privileges = require('../privileges'),
-	meta = require('./../meta'),
+	meta = require('../meta'),
-	user = require('./../user'),
+	user = require('../user'),
 
 	SocketCategories = {};
 
@@ -65,4 +66,8 @@ SocketCategories.getTopicCount = function(socket, cid, callback) {
 	categories.getCategoryField(cid, 'topic_count', callback);
 };
 
+SocketCategories.lastTopicIndex = function(socket, cid, callback) {
+	db.sortedSetCard('categories:' + cid + ':tid', callback);
+};
+
 module.exports = SocketCategories;

src/socket.io/topics.js

@@ -57,6 +57,10 @@ SocketTopics.postcount = function(socket, tid, callback) {
 	topics.getTopicField(tid, 'postcount', callback);
 };
 
+SocketTopics.lastPostIndex = function(socket, tid, callback) {
+	db.sortedSetCard('tid:' + tid + ':posts', callback);
+};
+
 SocketTopics.increaseViewCount = function(socket, tid) {
 	topics.increaseViewCount(tid);
 };