Generate hash-based permalinks

app/assets/javascripts/application.js

@@ -59,41 +59,22 @@ function remoteEditHandler(bbox, select) {
  * view tab and various other links
  */
 function updatelinks(loc, zoom, layers, bounds, object) {
-  var precision = zoomPrecision(zoom);
-  bounds = normalBounds(bounds);
-
-  var lat = loc.lat.toFixed(precision),
-      lon = (loc.lon || loc.lng).toFixed(precision);
-
-  if (bounds) {
-    var minlon = bounds.getWest().toFixed(precision),
-        minlat = bounds.getSouth().toFixed(precision),
-        maxlon = bounds.getEast().toFixed(precision),
-        maxlat = bounds.getNorth().toFixed(precision);
-  }
-
-  $(".geolink").each(setGeolink);
-
-  function setGeolink(index, link) {
+  $(".geolink").each(function(index, link) {
     var base = link.href.split('?')[0],
-        qs = link.href.split('?')[1],
-        args = querystring.parse(qs);
-
-    if ($(link).hasClass("llz")) {
-      $.extend(args, {
-          lat: lat,
-          lon: lon,
-          zoom: zoom
-      });
-    } else if (minlon && $(link).hasClass("bbox")) {
-      $.extend(args, {
-          bbox: minlon + "," + minlat + "," + maxlon + "," + maxlat
-      });
-    }
+        args = querystring.parse(link.search.substring(1));
 
+    if (bounds && $(link).hasClass("bbox")) args.bbox = normalBounds(bounds).toBBoxString();
     if (layers && $(link).hasClass("layers")) args.layers = layers;
     if (object && $(link).hasClass("object")) args[object.type] = object.id;
 
+    var href = base + '?' + querystring.stringify(args);
+
+    if ($(link).hasClass("llz")) {
+      href += OSM.formatHash({lat: loc.lat, lon: loc.lon || loc.lng, zoom: zoom});
+    }
+
+    link.href = href;
+
     var minzoom = $(link).data("minzoom");
     if (minzoom) {
       var name = link.id.replace(/anchor$/, "");
@@ -112,8 +93,7 @@ function updatelinks(loc, zoom, layers, bounds, object) {
           });
       }
     }
-    link.href = base + '?' + querystring.stringify(args);
-  }
+  });
 }
 
 // generate a cookie-safe string of map state

app/assets/javascripts/leaflet.extend.js.erb

@@ -29,22 +29,16 @@ L.extend(L.Map.prototype, {
   },
 
   getUrl: function(marker) {
-    var center = this.getCenter(),
-        zoom = this.getZoom(),
-        precision = zoomPrecision(zoom),
-        params = {
-          lat: center.lat.toFixed(precision),
-          lon: center.lng.toFixed(precision),
-          zoom: zoom,
-          layers: this.getLayersCode()
-        };
+    var precision = zoomPrecision(this.getZoom()),
+        params = { layers: this.getLayersCode() };
 
     if (marker && this.hasLayer(marker)) {
       params.mlat = marker.getLatLng().lat.toFixed(precision);
       params.mlon = marker.getLatLng().lng.toFixed(precision);
     }
 
-    return 'http://' + OSM.SERVER_URL + '/?' + querystring.stringify(params);
+    return 'http://' + OSM.SERVER_URL + '/?' + querystring.stringify(params) +
+      OSM.formatHash({lat: this.getCenter().lat, lon: this.getCenter().lng, zoom: this.getZoom()});
   },
 
   getShortUrl: function(marker) {

app/assets/javascripts/osm.js.erb

@@ -130,5 +130,12 @@ OSM = {
     }
 
     return mapParams;
+  },
+
+  formatHash: function(args) {
+    var precision = zoomPrecision(args.zoom);
+    return '#' + args.zoom +
+           '/' + args.lat.toFixed(precision) +
+           '/' + args.lon.toFixed(precision);
   }
 };