feat($http): upload and download event

Author: b1rdex

src/ng/http.js

@@ -683,7 +683,8 @@ function $HttpProvider() {
       var config = {
         method: 'get',
         transformRequest: defaults.transformRequest,
-        transformResponse: defaults.transformResponse
+        transformResponse: defaults.transformResponse,
+        progress: null
       };
       var headers = mergeHeaders(requestConfig);
 
@@ -990,7 +991,7 @@ function $HttpProvider() {
         }
 
         $httpBackend(config.method, url, reqData, done, reqHeaders, config.timeout,
-            config.withCredentials, config.responseType);
+            config.withCredentials, config.responseType, config.progress);
       }
 
       return promise;

src/ng/httpBackend.js

@@ -40,7 +40,7 @@ function createHttpBackend($browser, createXhr, $browserDefer, callbacks, rawDoc
   var ABORTED = -1;
 
   // TODO(vojta): fix the signature
-  return function(method, url, post, callback, headers, timeout, withCredentials, responseType) {
+  return function(method, url, post, callback, headers, timeout, withCredentials, responseType, progressCallback) {
     var status;
     $browser.$$incOutstandingRequestCount();
     url = url || $browser.url();
@@ -68,6 +68,13 @@ function createHttpBackend($browser, createXhr, $browserDefer, callbacks, rawDoc
         }
       });
 
+      if (typeof progressCallback === "function") {
+        xhr.onprogress = progressCallback;
+        if ("upload" in xhr) {
+          xhr.upload.onprogress = progressCallback;
+        }
+      }
+
       // In IE6 and 7, this might be called synchronously when xhr.send below is called and the
       // response is in the cache. the promise api will ensure that to the app code the api is
       // always async