From aeb94c32b939d467e8c315c14bec5c9826452009 Mon Sep 17 00:00:00 2001
From: Julian Lam <julian@nodebb.org>
Date: Mon, 19 Sep 2022 11:11:27 -0400
Subject: [PATCH] feat: j and k hotkeys in topic to navigate through it quickly

---
 public/src/client/topic.js | 40 ++++++++++++++++++++++++++++----------
 1 file changed, 30 insertions(+), 10 deletions(-)

diff --git a/public/src/client/topic.js b/public/src/client/topic.js
index 8f052bab2b..961fcd74c3 100644
--- a/public/src/client/topic.js
+++ b/public/src/client/topic.js
@@ -73,19 +73,39 @@ define('forum/topic', [
 	};
 
 	function handleTopicSearch() {
-		if (config.topicSearchEnabled) {
-			require(['mousetrap', 'search'], function (mousetrap, search) {
-				mousetrap.bind(['command+f', 'ctrl+f'], function (e) {
-					e.preventDefault();
-					$('#search-fields input').val('in:topic-' + ajaxify.data.tid + ' ');
-					search.showAndFocusInput();
-				});
+		require(['mousetrap'], (mousetrap) => {
+			if (config.topicSearchEnabled) {
+				require(['search'], function (search) {
+					mousetrap.bind(['command+f', 'ctrl+f'], function (e) {
+						e.preventDefault();
+						$('#search-fields input').val('in:topic-' + ajaxify.data.tid + ' ');
+						search.showAndFocusInput();
+					});
 
-				hooks.onPage('action:ajaxify.cleanup', () => {
-					mousetrap.unbind(['command+f', 'ctrl+f']);
+					hooks.onPage('action:ajaxify.cleanup', () => {
+						mousetrap.unbind(['command+f', 'ctrl+f']);
+					});
 				});
+			}
+
+			mousetrap.bind('j', () => {
+				const index = navigator.getIndex();
+				const count = navigator.getCount();
+				if (index === count) {
+					return;
+				}
+
+				navigator.scrollToIndex(index, true, 0);
 			});
-		}
+
+			mousetrap.bind('k', () => {
+				const index = navigator.getIndex();
+				if (index === 1) {
+					return;
+				}
+				navigator.scrollToIndex(index - 2, true, 0);
+			});
+		});
 	}
 
 	Topic.toTop = function () {