fixes #1385; fixes #1386

app/assets/javascripts/shortcuts.js

@@ -0,0 +1,36 @@
+(function() {
+  Danbooru.Shortcuts = {};
+
+  Danbooru.Shortcuts.initialize = function() {
+    $(document).bind("keydown.s", function(e) {
+      Danbooru.Shortcuts.nav_scroll_down();
+    })
+
+    $(document).bind("keydown.w", function(e) {
+      Danbooru.Shortcuts.nav_scroll_up();
+    })
+
+    $(document).bind("keydown.q", function(e) {
+      $("#tags, #search_name, #search_name_matches, #query").trigger("focus").selectEnd();
+      e.preventDefault();
+    });
+  }
+
+  Danbooru.Shortcuts.nav_scroll_down = function() {
+    var scroll_top = $(window).scrollTop() + ($(window).height() * 0.85);
+    Danbooru.scroll_to(scroll_top);
+  }
+
+  Danbooru.Shortcuts.nav_scroll_up = function() {
+    var scroll_top = $(window).scrollTop() - ($(window).height() * 0.85);
+    if (scroll_top < 0) {
+      scroll_top = 0;
+    }
+    Danbooru.scroll_to(scroll_top);
+  }
+})();
+
+
+$(document).ready(function() {
+  Danbooru.Shortcuts.initialize();
+});