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 bb7439f9aaa5a1923be1f6778c69b2e78556067b..bf4eda9127432fa27766670677868a5d7af97012 100644 (file)
--- a/public/javascripts/site.js
+++ b/public/javascripts/site.js
@@ -1,22 +1,45 @@
-function updatelinks(lon,lat,zoom,layers) {
-  var links = new Object();
-  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; }
+
+  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;
-    args["layers"] = layers;
+    if (layers) {
+      args["layers"] = layers;
+    }
     node.href = setArgs(node.href, args);
   }
 
@@ -27,13 +50,35 @@ function updatelinks(lon,lat,zoom,layers) {
       args.lat = lat;
       args.lon = lon;
       args.zoom = zoom;
-      node.href = setArgs("/edit.html", args);
+      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) {
@@ -70,3 +115,17 @@ function setArgs(url, args) {
 
    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;
+}