From e9e8b4239e799fee39c6c662dd0f3fe07f73ae91 Mon Sep 17 00:00:00 2001
From: "Istratov D. S" <d.istratov@advertur.ru>
Date: Wed, 30 Dec 2015 16:09:48 +0300
Subject: [PATCH] add navigation by keyboard using alt + left/right arrows

---
 src/theme/book.js   | 17 +++++++++++++++++
 src/theme/index.hbs |  4 ++--
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/src/theme/book.js b/src/theme/book.js
index 58d8eed9..776b4f16 100644
--- a/src/theme/book.js
+++ b/src/theme/book.js
@@ -23,6 +23,23 @@ $( document ).ready(function() {
         hljs.highlightBlock(block);
     });
 
+    var KEY_CODES = {
+        PREVIOUS_KEY: 37,
+        NEXT_KEY: 39
+    };
+
+    $(document).on('keydown', function (e) {
+        if (e.altKey === true) {
+            switch (e.keyCode) {
+                case KEY_CODES.NEXT_KEY:
+                    window.location.href = $('.nav-chapters.next').attr('href');
+                    break;
+                case KEY_CODES.PREV_KEY:
+                    window.location.href = $('.nav-chapters.previous').attr('href');
+                    break;
+            }
+        }
+    });
 
     // Interesting DOM Elements
     var html = $("html");
diff --git a/src/theme/index.hbs b/src/theme/index.hbs
index a8fdae1e..f84bdb87 100644
--- a/src/theme/index.hbs
+++ b/src/theme/index.hbs
@@ -84,13 +84,13 @@
             </div>
 
             {{#previous}}
-                <a href="{{link}}" class="nav-chapters previous">
+                <a href="{{link}}" class="nav-chapters previous" title="Alt + &larr;">
                     <i class="fa fa-angle-left"></i>
                 </a>
             {{/previous}}
 
             {{#next}}
-                <a href="{{link}}" class="nav-chapters next">
+                <a href="{{link}}" class="nav-chapters next" title="Alt + &rarr;">
                     <i class="fa fa-angle-right"></i>
                 </a>
             {{/next}}