Update iD frame parameters if the parent URL changes

Fixes #1468

app/views/site/_id.html.erb

@@ -5,6 +5,7 @@
   <script>
     var params = {};
 
+    function getParams(params) {
       var mapParams = OSM.mapParams();
       if (mapParams.object) {
         params.id = mapParams.object.type[0] + mapParams.object.id;
@@ -13,12 +14,15 @@
           params.map = mapParams.zoom + '/' + mapParams.center.lat + '/' + mapParams.center.lng;
         }
       } else {
+        params.map = (mapParams.zoom || 17) + '/' + mapParams.lat + '/' + mapParams.lon;
+      }
+    }
+
+    getParams(params);
+
 <% if @lat && @lon -%>
     params.map = '16/<%= @lat %>/<%= @lon %>';
-<% else -%>
-      params.map = (mapParams.zoom || 17) + '/' + mapParams.lat + '/' + mapParams.lon;
 <% end -%>
-    }
 
     var hashParams = OSM.params(location.hash.substring(1));
 
@@ -40,7 +44,14 @@
     }
 <% end -%>
 
-    $('#id-embed').attr('src', '<%= id_url :locale => params[:locale] %>#' + querystring.stringify(params));
+    var baseUrl = '<%= id_url :locale => params[:locale] %>#';
+
+    $('#id-embed').attr('src', baseUrl + querystring.stringify(params));
+
+    $(window).on('hashchange', function () {
+      getParams(params);
+      $('#id-embed').attr('src', baseUrl + querystring.stringify(params));
+    });
   </script>
 <% else %>
   <script type="text/javascript">alert("<%= t 'site.edit.id_not_configured' %>")</script>