Add ExtendedData support to KML. r=tschaub, patch mine + his comments,

thx to rdewit for initial help/pointers, (Closes #1955)


git-svn-id: http://svn.openlayers.org/trunk/openlayers@9089 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Format/KML.js

@@ -840,9 +840,17 @@ OpenLayers.Format.KML = OpenLayers.Class(OpenLayers.Format.XML, {
      */
     parseAttributes: function(node) {
         var attributes = {};
+       
+        // Extended Data is parsed first.
+        var edNodes = node.getElementsByTagName("ExtendedData");
+        if (edNodes.length) {
+            attributes = this.parseExtendedData(edNodes[0]);
+        }
+        
         // assume attribute nodes are type 1 children with a type 3 or 4 child
         var child, grandchildren, grandchild;
         var children = node.childNodes;
+
         for(var i=0, len=children.length; i<len; ++i) {
             child = children[i];
             if(child.nodeType == 1) {
@@ -874,6 +882,31 @@ OpenLayers.Format.KML = OpenLayers.Class(OpenLayers.Format.XML, {
         return attributes;
     },
 
+    /**
+     * Method: parseExtendedData
+     * Parse ExtendedData from KML. No support for schemas/datatypes.
+     *     See http://code.google.com/apis/kml/documentation/kmlreference.html#extendeddata
+     *     for more information on extendeddata.
+     */
+    parseExtendedData: function(node) {
+        var attributes = {};
+        var dataNodes = node.getElementsByTagName("Data");
+        for (var i = 0, len = dataNodes.length; i < len; i++) {
+            var data = dataNodes[i];
+            var key = data.getAttribute("name");
+            var ed = {};
+            var valueNode = data.getElementsByTagName("value");
+            if (valueNode.length) {
+                ed['value'] = this.concatChildValues(valueNode[0]);
+            }    
+            var nameNode = data.getElementsByTagName("displayName");
+            if (nameNode.length) {
+                ed['displayName'] = this.concatChildValues(nameNode[0]);
+            }
+            attributes[key] = ed;
+        }
+        return attributes;    
+    },
     
     /**
      * Method: parseProperty