1 files changed, 17 insertions, 0 deletions
diff --git a/lib/rdoc/generator/template/darkfish/js/darkfish.js b/lib/rdoc/generator/template/darkfish/js/darkfish.js
index 19a85c54e1..bea0a5f1cb 100644
--- a/lib/rdoc/generator/template/darkfish/js/darkfish.js
+++ b/lib/rdoc/generator/template/darkfish/js/darkfish.js
@@ -90,8 +90,25 @@ function hookFocus() {
   });
 }
 
+function hookSidebar() {
+  var navigation = document.querySelector('#navigation');
+  var navigationToggle = document.querySelector('#navigation-toggle');
+
+  navigationToggle.addEventListener('click', function() {
+    navigation.hidden = !navigation.hidden;
+    navigationToggle.ariaExpanded = navigationToggle.ariaExpanded !== 'true';
+  });
+
+  var isSmallViewport = window.matchMedia("(max-width: 1024px)").matches;
+  if (isSmallViewport) {
+    navigation.hidden = true;
+    navigationToggle.ariaExpanded = false;
+  }
+}
+
 document.addEventListener('DOMContentLoaded', function() {
   hookSourceViews();
   hookSearch();
   hookFocus();
+  hookSidebar();
 });