update helloworld sample to use more modern JS APIs, fixes #83

Author: aoberoi

sample/HelloWorld/public/js/helloworld.js

@@ -1,32 +1,29 @@
 // Initialize an OpenTok Session object
-var session = TB.initSession(sessionId);
+var session = OT.initSession(sessionId);
 
 // Initialize a Publisher, and place it into the element with id="publisher"
-var publisher = TB.initPublisher(apiKey, 'publisher');
+var publisher = OT.initPublisher(apiKey, 'publisher');
 
-// Attach event handlers
-session.on({
+// Attach an event handler for when the session dispatches the 'streamCreated' event.
+session.on('streamCreated', function(event) {
+    // This function runs when another client publishes a stream (eg. session.publish())
 
-  // This function runs when session.connect() asynchronously completes
-  sessionConnected: function(event) {
-    // Publish the publisher we initialzed earlier (this will trigger 'streamCreated' on other
-    // clients)
-    session.publish(publisher);
-  },
+    // Subscribe to the stream that caused this event, put it inside the DOM element with id='subscribers'
+    session.subscribe(event.stream, 'subscribers', {
+        insertMode: 'append'
+    });
+});
 
-  // This function runs when another client publishes a stream (eg. session.publish())
-  streamCreated: function(event) {
-    // Create a container for a new Subscriber, assign it an id using the streamId, put it inside
-    // the element with id="subscribers"
-    var subContainer = document.createElement('div');
-    subContainer.id = 'stream-' + event.stream.streamId;
-    document.getElementById('subscribers').appendChild(subContainer);
+// Connect to the Session using the 'apiKey' of the application and a 'token' for permission
+session.connect(apiKey, token, function(error) {
+    // This function runs when session.connect() asynchronously completes
 
-    // Subscribe to the stream that caused this event, put it inside the container we just made
-    session.subscribe(event.stream, subContainer);
-  }
+    // Handle connection errors
+    if (error) {
+        return console.error(error);
+    }
 
+    // Publish the publisher we initialzed earlier (this will trigger 'streamCreated' on other
+    // clients)
+    session.publish(publisher);
 });
-
-// Connect to the Session using the 'apiKey' of the application and a 'token' for permission
-session.connect(apiKey, token);