Scroll to next/previous thread when pressing j/k (fixes #3327)

diff --git a/js/main.js b/js/main.js
index 556e4ed8cf082a32dd8f0578197b3647d76b76c4..98c219d78cabb8e4d06aa1090730c6d2ec146120 100644 (file)
--- a/js/main.js
+++ b/js/main.js
@@ -322,6 +322,29 @@
                        }
                });
 
+               $(document).keydown(function (event) {
+                       var threads = $('.thread_level_1');
+                       if ((event.keyCode === 74 || event.keyCode === 75) && !$(event.target).is('textarea, input')) {
+                               var scrollTop = $(window).scrollTop();
+                               if (event.keyCode === 75) {
+                                       threads = $(threads.get().reverse());
+                               }
+                               threads.each(function(key, item) {
+                                       var comparison;
+                                       var top = $(item).offset().top - 100;
+                                       if (event.keyCode === 74) {
+                                               comparison = top > scrollTop + 1;
+                                       } else if (event.keyCode === 75) {
+                                               comparison = top < scrollTop - 1;
+                                       }
+                                       if (comparison) {
+                                               $('html, body').animate({ scrollTop: top }, 200);
+                                               return false;
+                                       }
+                               });
+                       }
+               });
+
                // Set an event listener for infinite scroll
                if(typeof infinite_scroll !== 'undefined') {
                        $(window).scroll(function(e){