From 9bcd049c98eb09e0b822710448e64dd5c266c498 Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Mon, 9 Sep 2013 15:17:09 +0100
Subject: [PATCH] Notice, and act on, changes to the layer parameter in the URL
 bar

---
 app/assets/javascripts/index.js | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/app/assets/javascripts/index.js b/app/assets/javascripts/index.js
index d577e0cf7..a19a6a61e 100644
--- a/app/assets/javascripts/index.js
+++ b/app/assets/javascripts/index.js
@@ -51,13 +51,24 @@ $(document).ready(function () {
     })
   ];
 
-  for (var i = layers.length - 1; i >= 0; i--) {
-    if (i === 0 || params.layers.indexOf(layers[i].options.code) >= 0) {
-      map.addLayer(layers[i]);
-      break;
+  function updateLayers(params) {
+    var layerParam = params.layers || "M";
+
+    for (var i = layers.length - 1; i >= 0; i--) {
+      if (layerParam.indexOf(layers[i].options.code) >= 0) {
+        map.addLayer(layers[i]);
+      } else {
+        map.removeLayer(layers[i]);
+      }
     }
   }
 
+  updateLayers(params);
+
+  $(window).on("hashchange", function () {
+    updateLayers(OSM.mapParams());
+  });
+
   map.noteLayer = new L.LayerGroup();
   map.noteLayer.options = {code: 'N'};
 
-- 
2.39.5