Showing unread posts count when new posts appear in the background tab

boards/static/js/thread_update.js

@@ -1,192 +1,197 b''
 /*
  @licstart  The following is the entire license notice for the
  JavaScript code in this page.
 
 
  Copyright (C) 2013  neko259
 
  The JavaScript code in this page is free software: you can
  redistribute it and/or modify it under the terms of the GNU
  General Public License (GNU GPL) as published by the Free Software
  Foundation, either version 3 of the License, or (at your option)
  any later version.  The code is distributed WITHOUT ANY WARRANTY;
  without even the implied warranty of MERCHANTABILITY or FITNESS
  FOR A PARTICULAR PURPOSE.  See the GNU GPL for more details.
 
  As additional permission under GNU GPL version 3 section 7, you
  may distribute non-source (e.g., minimized or compacted) forms of
  that code without the copy of the GNU GPL normally required by
  section 4, provided you include this license notice and a URL
  through which recipients can access the Corresponding Source.
 
  @licend  The above is the entire license notice
  for the JavaScript code in this page.
  */
 
 var THREAD_UPDATE_DELAY = 10000;
 
 var loading = false;
 var lastUpdateTime = null;
+var unreadPosts = 0
 
 function blink(node) {
     var blinkCount = 2;
     var blinkDelay = 250;
 
     var nodeToAnimate = node;
     for (var i = 0; i < blinkCount; i++) {
         nodeToAnimate = nodeToAnimate.fadeOut(blinkDelay).fadeIn(blinkDelay);
     }
 }
 
 function updateThread() {
     if (loading) {
         return;
     }
 
     loading = true;
 
     var threadPosts = $('div.thread').children('.post');
 
     var lastPost = threadPosts.last();
     var threadId = threadPosts.first().attr('id');
 
     var diffUrl = '/api/diff_thread/' + threadId + '/' + lastUpdateTime + '/';
     $.getJSON(diffUrl)
         .success(function(data) {
             var bottom = isPageBottom();
 
             var addedPosts = data.added;
             for (var i = 0; i < addedPosts.length; i++) {
                 var postText = addedPosts[i];
 
                 var post = $(postText);
                 post.appendTo(lastPost.parent());
                 addRefLinkPreview(post[0]);
 
                 lastPost = post;
                 blink(post);
             }
 
             var updatedPosts = data.updated;
             for (var i = 0; i < updatedPosts.length; i++) {
                 var postText = updatedPosts[i];
 
                 var post = $(postText);
                 var postId = post.attr('id');
 
                 var oldPost = $('div.thread').children('.post[id=' + postId + ']');
                 
                 oldPost.replaceWith(post);
                 addRefLinkPreview(post[0]);
 
                 blink(post);
             }
             
             // TODO Process deleted posts
 
             lastUpdateTime = data.last_update;
             loading = false;
 
             if (bottom) {
                 var $target = $('html,body');
                 $target.animate({scrollTop: $target.height()}, 1000);
             }
 
             $('#reply-count').text(getReplyCount());
             $('#image-count').text(getImageCount());
 
             updateBumplimitProgress(data.added.length);
             updatePostBumpableStatus();
 
             if (data.added.length + data.updated.length > 0) {
-                showNewPostsTitle();
+                showNewPostsTitle(data.added.length);
             }
         })
         .error(function(data) {
             // TODO Show error message that server is unavailable?
 
             loading = false;
         });
 }
 
 function isPageBottom() {
     var scroll = $(window).scrollTop() / ($(document).height()
         - $(window).height())
 
     return scroll == 1
 }
 
 function initAutoupdate() {
     loading = false;
 
     lastUpdateTime = $('.metapanel').attr('data-last-update');
 
     setInterval(updateThread, THREAD_UPDATE_DELAY);
 }
 
 function getReplyCount() {
     return $('.thread').children('.post').length
 }
 
 function getImageCount() {
     return $('.thread').find('img').length
 }
 
 /**
  * Update bumplimit progress bar
  */
 function updateBumplimitProgress(postDelta) {
     var progressBar = $('#bumplimit_progress');
     if (progressBar) {
         var postsToLimitElement = $('#left_to_limit');
 
         var oldPostsToLimit = parseInt(postsToLimitElement.text());
         var postCount = getReplyCount();
         var bumplimit = postCount - postDelta + oldPostsToLimit;
 
         var newPostsToLimit = bumplimit - postCount;
         if (newPostsToLimit <= 0) {
             $('.bar-bg').remove();
         } else {
             postsToLimitElement.text(newPostsToLimit);
             progressBar.width((100 - postCount / bumplimit * 100.0) + '%');
         }
     }
 }
 
 /**
  * If the bumplimit is reached, add dead_post class to all posts
  */
 function updatePostBumpableStatus() {
     var postCount = getReplyCount();
     var postsToLimitElement = $('#left_to_limit');
     var postsToLimit = parseInt(postsToLimitElement.text());
 
     if (postsToLimit <= 0) {
         $('.thread').find('.post').addClass('dead_post');
     }
 }
 
 var documentOriginalTitle = '';
 /**
  * Show 'new posts' text in the title if the document is not visible to a user
  */
-function showNewPostsTitle() {
+function showNewPostsTitle(newPostCount) {
     if (document.hidden) {
-        documentOriginalTitle = document.title;
-        document.title = gettext('[new posts]') + ' ' + document.title;
+        if (documentOriginalTitle === '') {
+            documentOriginalTitle = document.title;
+        }
+        unreadPosts = unreadPosts + newPostCount;
+        document.title = '[' + unreadPosts + '] ' + documentOriginalTitle;
 
         document.addEventListener('visibilitychange', function() {
             if (documentOriginalTitle !== '') {
                 document.title = documentOriginalTitle;
                 documentOriginalTitle = '';
+                unreadPosts = 0;
             }
 
             document.removeEventListener('visibilitychange', null);
         });
     }
 }
 
 $(document).ready(function(){
     initAutoupdate();
 });