Factor out javascript code to support OpenLayers maps into a common file

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

diff --git a/public/javascripts/site.js b/public/javascripts/site.js
index e7ef320bcadaea835f499ee92405d8e372602a1e..781940fa6494a84a8c578b034a6b18b881ea61d6 100644 (file)
--- a/public/javascripts/site.js
+++ b/public/javascripts/site.js
@@ -1,5 +1,5 @@
 function updatelinks(lon,lat,zoom) {
-  var links = new Array();
+  var links = new Object();
   links['viewanchor'] = '/index.html';
   //links['editanchor'] = 'edit.html';
   links['uploadanchor'] = '/traces';
@@ -12,13 +12,21 @@ function updatelinks(lon,lat,zoom) {
   for (anchor in links) {
     node = document.getElementById(anchor);
     if (! node) { continue; }
-    node.href = links[anchor] + "?lat=" + lat + "&lon=" + lon + "&zoom=" + zoom;
+    var args = getArgs(node.href);
+    args["lat"] = lat;
+    args["lon"] = lon;
+    args["zoom"] = zoom;
+    node.href = setArgs(node.href, args);
   }
 
   node = document.getElementById("editanchor");
   if (node) {
-    if ( zoom >= 14) {
-      node.href = '/edit.html?lat=' + lat + '&lon=' + lon + "&zoom=" + zoom;
+    if (zoom >= 11) {
+      var args = new Object();
+      args.lat = lat;
+      args.lon = lon;
+      args.zoom = zoom;
+      node.href = setArgs("/edit.html", args);
       node.style.fontStyle = 'normal';
     } else {
       node.href = 'javascript:alert("zoom in to edit map");';
@@ -26,3 +34,38 @@ function updatelinks(lon,lat,zoom) {
     }
   }
 }
+
+function getArgs(url) {
+  var args = new Object();
+  var querystart = url.indexOf("?");
+
+  if (querystart >= 0) {
+     var querystring = url.substring(querystart + 1);
+     var queryitems = querystring.split("&");
+
+     for (var i = 0; i < queryitems.length; i++) {
+        if (match = queryitems[i].match(/^(.*)=(.*)$/)) {
+           args[unescape(match[1])] = unescape(match[2]);
+        } else {
+           args[unescape(queryitems[i])] = null
+        }
+     }
+  }
+
+  return args;
+}
+
+function setArgs(url, args) {
+   var queryitems = new Array();
+
+   for (arg in args)
+   {
+      if (args[arg] == null) {
+         queryitems.push(escape(arg));
+      } else {
+         queryitems.push(escape(arg) + "=" + escape(args[arg]));
+      }
+   }
+
+   return url.replace(/\?.*$/, "") + "?" + queryitems.join("&");
+}