Support onload/onerror events on XMLHttpRequest.

apps/tests/http-tests.ts

@@ -598,3 +598,21 @@ export var test_XMLHttpRequest_requestShouldBePossibleAfterAbort = function (don
 
     xhr.send(JSON.stringify({ MyVariableOne: "ValueOne", MyVariableTwo: "ValueTwo" }));
 };
+
+export function test_raises_onload_Event(done) {
+    let xhr = new XMLHttpRequest();
+    xhr.onload = () => {
+        done(null);
+    }
+    xhr.open("GET", "https://httpbin.org/get");
+    xhr.send();
+}
+
+export function test_raises_onerror_Event(done) {
+    let xhr = new XMLHttpRequest();
+    xhr.onerror = () => {
+        done(null);
+    }
+    xhr.open("GET", "https://no-such-domain-httpbin.org");
+    xhr.send();
+}

declarations.d.ts

@@ -38,6 +38,9 @@ declare class XMLHttpRequest {
     readyState: number;
     responseText: string;
     status: number;
+
+    onload: () => void;
+    onerror: () => void;
 }
 
 /**

http/http.ts

@@ -39,6 +39,9 @@ export class XMLHttpRequest {
     public LOADING = 3;
     public DONE = 4;
 
+    public onload: () => void;
+    public onerror: () => void;
+
     private _options: definition.HttpRequestOptions;
     private _readyState: number;
     private _status: number;
@@ -113,6 +116,7 @@ export class XMLHttpRequest {
 
             }).catch(e => {
                 this._errorFlag = true;
+                this._setReadyState(this.DONE);
             });
         }
     }
@@ -167,6 +171,15 @@ export class XMLHttpRequest {
                 this.onreadystatechange();
             }
         }
+
+        if (this._readyState === this.DONE) {
+            if (this._errorFlag && types.isFunction(this.onerror)) {
+                this.onerror();
+            }
+            if (!this._errorFlag && types.isFunction(this.onload)) {
+                this.onload();
+            }
+        }
     }
 
     get responseText(): string {