and the accompanying SWF

[rails.git] / public / javascripts / site.js

diff --git a/public/javascripts/site.js b/public/javascripts/site.js
index 5340ea99eeb4b3a64ae1aa31060319dc2c002702..3e28e0c0a059ab0650c48e770aea2a6835121480 100644 (file)
--- a/public/javascripts/site.js
+++ b/public/javascripts/site.js
@@ -2,7 +2,7 @@
  * Called as the user scrolls/zooms around to aniplate hrefs of the
  * view tab and various other links
  */
-function updatelinks(lon,lat,zoom,layers,minlon,minlat,maxlon,maxlat, obj_type, obj_id) {
+function updatelinks(lon,lat,zoom,layers,minlon,minlat,maxlon,maxlat,objtype,objid) {
   var decimals = Math.pow(10, Math.floor(zoom/3));
   var node;
 
@@ -18,8 +18,8 @@ function updatelinks(lon,lat,zoom,layers,minlon,minlat,maxlon,maxlat, obj_type,
     if (layers) {
       args["layers"] = layers;
     }
-    if (obj_type && obj_id) {
-      args[obj_type] = obj_id;
+    if (objtype && objid) {
+      args[objtype] = objid;
     }
     node.href = setArgs(node.href, args);
   }
@@ -55,6 +55,9 @@ function updatelinks(lon,lat,zoom,layers,minlon,minlat,maxlon,maxlat, obj_type,
       args.lat = lat;
       args.lon = lon;
       args.zoom = zoom;
+      if (objtype && objid) {
+        args[objtype] = objid;
+      }
       node.href = setArgs("/edit", args);
       node.style.fontStyle = 'normal';
     } else {
@@ -92,17 +95,46 @@ function updatelinks(lon,lat,zoom,layers,minlon,minlat,maxlon,maxlat, obj_type,
   if (node) {
     var args = getArgs(node.href);
     var code = makeShortCode(lat, lon, zoom);
-    // little hack. may the gods of hardcoding please forgive me, or 
-    // show me the Right way to do it.
-    if (layers && (layers != "B000FTF")) {
+    var prefix = shortlinkPrefix();
+
+    // Add ?{node,way,relation}=id to the arguments
+    if (objtype && objid) {
+      args[objtype] = objid;
+    }
+
+    // This is a hack to omit the default mapnik layer (B000FTF) from
+    // the shortlink. B000FTFT is then the "Object" layer which we get
+    // on /?{node,way,relation}=id
+    if (layers && (layers != "B000FTF") && (layers != "B000FTFT")) {
       args["layers"] = layers;
-      node.href = setArgs("http://osm.org/go/" + code, args);
+    }
+
+    // Here we're assuming that all parameters but ?layers= and
+    // ?{node,way,relation}= can be safely omitted from the shortlink
+    // which encodes lat/lon/zoom. If new URL parameters are added to
+    // the main slippy map this needs to be changed.
+    if (args["layers"] || args[objtype]) {
+      node.href = setArgs(prefix + "/go/" + code, args);
     } else {
-      node.href = "http://osm.org/go/" + code;
+      node.href = prefix + "/go/" + code;
     }
   }
 }
 
+/*
+ * Get the URL prefix to use for a short link
+ */
+function shortlinkPrefix() {
+  if (window.location.hostname.match(/^www\.openstreetmap\.org/i)) {
+    return "http://osm.org";
+  } else {
+    return "";     
+  }
+}
+
+/*
+ * Called to get the arguments from a URL as a hash.
+ */
 function getArgs(url) {
   var args = new Object();
   var querystart = url.indexOf("?");
@@ -142,7 +174,7 @@ function setArgs(url, args) {
 }
 
 /*
- * Called to get the arguments from a URL as a hash.
+ * Called to get a CSS property for an element.
  */
 function getStyle(el, property) {
   var style;
@@ -202,7 +234,7 @@ function makeShortCode(lat, lon, zoom) {
        str += char_array.charAt(digit);
     }
     for (var i = 0; i < ((zoom + 8) % 3); ++i) {
-       str += "=";
+       str += "-";
     }
     return str;
 }