iOS: TVML: Loading page with loaded local document

TVMLLoading.js

var baseURL = "http://localhost:9001/"

function getDocument(url) {
    var templateXHR = new XMLHttpRequest();
    templateXHR.responseType = "document";
    templateXHR.addEventListener("load", function() {pushDoc(templateXHR.responseXML);}, false);
    templateXHR.open("GET", url, true);
    templateXHR.send();
}

function pushDoc(document) {
    navigationDocument.pushDocument(document);
}

function loadingDoc() {
    var template = `
    <document>
        <loadingTemplate>
            <activityIndicator><text>Loading</text></activityIndicator>
        </loadingTemplate>
    </document>
    `;
    
    var templateParser = new DOMParser();
    var parsedTemplate = templateParser.parseFromString(template, "application/xml");
    navigationDocument.pushDocument(parsedTemplate);
}

App.onLaunch = function(options) {

    loadingDoc()
    
    var templateURL = baseURL + "templates/HelloWorld.xml";
    
    getDocument(templateURL);
}