Abort XMLHttpRequest on tile.destroy for WFS. The loadURL function now returns a request object. Thanks pgiraud for the fix. r=crschmidt (closes #964)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@5539 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Ajax.js

@@ -45,10 +45,16 @@ OpenLayers.nullHandler = function(request) {
  * uri - {String} URI of source doc
  * params - {String} Params on get (doesnt seem to work)
  * caller - {Object} object which gets callbacks
- * onComplete - {Function} callback for success
- * onFailure - {Function} callback for failure
+ * onComplete - {Function} Optional callback for success.  The callback
+ *     will be called with this set to caller and will receive the request
+ *     object as an argument.
+ * onFailure - {Function} Optional callback for failure.  In the event of
+ *     a failure, the callback will be called with this set to caller and will
+ *     receive the request object as an argument.
  *
- * Both callbacks optional (though silly)
+ * Returns:
+ * {OpenLayers.Ajax.Request}  The request object.  To abort loading, call
+ *     request.transport.abort();
  */
 OpenLayers.loadURL = function(uri, params, caller,
                                   onComplete, onFailure) {
@@ -64,13 +70,15 @@ OpenLayers.loadURL = function(uri, params, caller,
                            : OpenLayers.nullHandler;
 
     // from prototype.js
-    new OpenLayers.Ajax.Request(uri, 
-                     {   method: 'get', 
-                         parameters: params,
-                         onComplete: success, 
-                         onFailure: failure
-                      }
-                     );
+    return new OpenLayers.Ajax.Request(
+        uri, 
+        {
+            method: 'get', 
+            parameters: params,
+            onComplete: success, 
+            onFailure: failure
+        }
+    );
 };
 
 /**