application.js

App.onLaunch = function(options) {
  var templateURL = 'http://localhost:9001/templates/alert.tvml';

  function getDoc(url) {
    var request = new XMLHttpRequest();
    request.responseType = "application/xml";
    request.addEventListener("load", function() {
      navigationDocument.pushDocument(request.responseXML)
    }, false);
    request.open("GET", url, true);
    request.send();
    return request;
  }

  getDoc(templateURL);
}