In your javascript file, find the listview control in your onReady function, something like this:
Assuming the id of your listview is list1.
var myList = document.querySelector("#list1");
if (myList) {myList.winControl.onloadingstatechanged = onLoadingStateChanged;}
then add an event handler
var onLoadingStateChanged = WinJS.UI.eventHandler(function(e) {
if (e.currentTarget.winControl.loadingState == "complete") {
// do whatever you want to do
}
};