The event handler method receives the following arguments:
sender
An ObservableCollection instance, which is the source of the event. This object will be passed to the handler function as the first argument.
args
A NotifyCollectionChangedEventArgs instance, which contains event data. This object will be passed to the handler function as the second argument.

The following code handles the collectionChanged event on the collection of items of a ListView object that is of type ObservableCollection:

JavaScript  Copy Code
var nodeList = new ui.ListView(document.getElementById("nodeList")); nodeList.items.collectionChanged.addEventListener(itemsCollectionChangedEventHandler); function itemsCollectionChangedEventHandler(sender, args) {  if(args.action == ui.NotifyCollectionChangedAction.Add)  {        //do something  }  }

ObservableCollection Members
ObservableCollection Class
MindFusion.Common.Collections Namespace