Fix multiple issues with links to /history from the homepage. Thanks to Ed Avis for...

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

diff --git a/public/javascripts/site.js b/public/javascripts/site.js
index e7ef320bcadaea835f499ee92405d8e372602a1e..bf4eda9127432fa27766670677868a5d7af97012 100644 (file)
--- a/public/javascripts/site.js
+++ b/public/javascripts/site.js
@@ -1,28 +1,131 @@
-function updatelinks(lon,lat,zoom) {
-  var links = new Array();
-  links['viewanchor'] = '/index.html';
-  //links['editanchor'] = 'edit.html';
-  links['uploadanchor'] = '/traces';
-  links['loginanchor'] = '/login.html';
-  links['logoutanchor'] = '/logout.html';
-  links['registeranchor'] = '/create-account.html';
-
+//Called as the user scrolls/zooms around.
+//Maniplate hrefs of the view tab and various other links
+function updatelinks(lon,lat,zoom,layers,extents) {
+  var decimals = Math.pow(10, Math.floor(zoom/3));
   var node;
-  var anchor;
-  for (anchor in links) {
-    node = document.getElementById(anchor);
-    if (! node) { continue; }
-    node.href = links[anchor] + "?lat=" + lat + "&lon=" + lon + "&zoom=" + zoom;
+
+  lat = Math.round(lat * decimals) / decimals;
+  lon = Math.round(lon * decimals) / decimals;
+
+  node = document.getElementById("permalinkanchor");
+  if (node) {
+    var args = getArgs(node.href);
+    args["lat"] = lat;
+    args["lon"] = lon;
+    args["zoom"] = zoom;
+    if (layers) {
+      args["layers"] = layers;
+    }
+    node.href = setArgs(node.href, args);
+  }
+
+  node = document.getElementById("viewanchor");
+  if (node) {
+    var args = getArgs(node.href);
+    args["lat"] = lat;
+    args["lon"] = lon;
+    args["zoom"] = zoom;
+    if (layers) {
+      args["layers"] = layers;
+    }
+    node.href = setArgs(node.href, args);
+  }
+
+  node = document.getElementById("exportanchor");
+  if (node) {
+    var args = getArgs(node.href);
+    args["lat"] = lat;
+    args["lon"] = lon;
+    args["zoom"] = zoom;
+    if (layers) {
+      args["layers"] = layers;
+    }
+    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", args);
       node.style.fontStyle = 'normal';
     } else {
       node.href = 'javascript:alert("zoom in to edit map");';
       node.style.fontStyle = 'italic';
     }
   }
+  
+  node = document.getElementById("historyanchor");
+  if (node) {
+    if (zoom >= 11) {
+      var args = new Object();
+      //set bbox param from 'extents' object
+      minlon = extents.left;
+      minlat = extents.bottom;
+      maxlon = extents.right;
+      maxlat = extents.top;
+      minlon = Math.round(minlon * decimals) / decimals;
+      minlat = Math.round(minlat * decimals) / decimals;
+      maxlon = Math.round(maxlon * decimals) / decimals;
+      maxlat = Math.round(maxlat * decimals) / decimals;
+      args.bbox = minlon + "," + minlat + "," + maxlon + "," + maxlat;
+      node.href = setArgs("/history", args);
+      node.style.fontStyle = 'normal';
+    } else {
+      node.href = 'javascript:alert("zoom in to see editing history");';
+      node.style.fontStyle = 'italic';
+    }
+  }
+}
+
+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("&");
+}
+
+function getStyle(el, property) {
+  var style;
+
+  if (el.currentStyle) {
+    style = el.currentStyle[property];
+  } else if( window.getComputedStyle ) {
+    style = document.defaultView.getComputedStyle(el,null).getPropertyValue(property);
+  } else {
+    style = el.style[property];
+  }
+
+  return style;
 }