Changes regarding to onFinish event, request credentials and IE9 compatibility

src/vast-vmap.js

@@ -25,22 +25,60 @@ var VASTAds, VASTAd, VASTLinear, VASTNonLinear, VASTCompanion;
  *   identifier.
  */
 function fetchXML(url, identifier, onSuccess, onFailure) {
-  var request = new XMLHttpRequest();
-  request.onreadystatechange = function() {
-    if (request.readyState === 4) {
-      if (request.status === 200) {
-        if (request.responseXML !== null) {
-          onSuccess(request.responseXML, identifier);
+  var request;
+
+  // IE 9 CORS method
+  if (window.XDomainRequest)
+  {
+    request = new XDomainRequest();
+
+    request.onload = function()
+    {
+
+      if (request.contentType != null && request.responseText != null)
+      {
+
+        // IE < 10 requires to parse the XML as string in order to use the getElementsByTagNameNS method
+        var parser = new DOMParser();
+        var doc = parser.parseFromString(request.responseText, 'text/xml');
+
+        onSuccess(doc, identifier);
+
+      }
+      else
+        onFailure(request, identifier);
+
+    };
+
+    request.onerror = request.ontimeout = function()
+    {
+      onFailure(request, identifier);
+    };
+
+  }
+  else // The standard one
+  {
+
+    request = new XMLHttpRequest();
+
+    request.onreadystatechange = function() {
+      if (request.readyState === 4) {
+        if (request.status === 200) {
+          if (request.responseXML !== null) {
+            onSuccess(request.responseXML, identifier);
+          } else {
+            onFailure(request, identifier);
+          }
         } else {
           onFailure(request, identifier);
         }
-      } else {
-        onFailure(request, identifier);
       }
-    }
-  };
+    };
+
+  }
 
   request.open("GET", url, true);
+  request.withCredentials = true;   // Accept cookies
   request.send(null);
 }
 
@@ -53,8 +91,9 @@ function fetchXML(url, identifier, onSuccess, onFailure) {
  * @param { {function()}} onError Function to call when no ads are fetched
  *   or there was an error requesting the endpoint
  * @param {?VASTAd} parentAd The ad containing the results from this query
+ * @param {funciton()}} onFinish Fuction to call when request is finished
  */
-function queryVAST(endpoint, onFetched, onError, parentAd) {
+function queryVAST(endpoint, onFetched, onError, parentAd, onFinish) {
   fetchXML(endpoint, null, function(doc) {
     try {
       new VASTAds(doc, onFetched, onError, parentAd);
@@ -70,9 +109,14 @@ function queryVAST(endpoint, onFetched, onError, parentAd) {
 
       onError();
     }
+
+    if (onFinish) onFinish();
+
   }, function (e) {
     console.error("Failed to load VAST from '" + endpoint + "':", e);
     onError();
+
+    if (onFinish) onFinish();
   });
 }
 
@@ -1086,7 +1130,7 @@ function VASTLinear(ad, root) {
   this.clickThrough = null;
   this.duration = null;
   this.adParameters = null;
-  
+
   var i;
 
   var clicks = root.getElementsByTagName("VideoClicks");