iOS: TVML: Load data from Json file and display image

TVMLJson.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", baseURL + url, true);
    templateXHR.send();
}

function getDocumentJson(url) {
    var templateXHR = new XMLHttpRequest();
    templateXHR.responseType = "document";
    templateXHR.addEventListener("load", function() { parseJson(templateXHR.responseText);}, false);
    templateXHR.open("GET", baseURL + 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);
}

function parseJson(information) {
    var result = JSON.parse(information);
    
    // list of mascots
    var mascots = "";
    for (i = 0; i < result.length; ++i) {
        mascots += '<lockup><img src="' + baseURL + result[i].url + '" width="182" height="274" /><title>' + result[i].title + '</title></lockup>';
    }

    // page of mascots
    var template = '<document><stackTemplate><banner><title>Mascots</title></banner><collectionList><shelf><section>' + mascots + '</section></shelf></collectionList></stackTemplate></document>';

    // construct page
    var templateParser = new DOMParser();
    var parsedTemplate = templateParser.parseFromString(template, "application/xml");

    // view
    navigationDocument.pushDocument(parsedTemplate);
}

App.onLaunch = function(options) {

    loadingDoc()
    
    var templateURL = "images.json";

    getDocumentJson(templateURL);
}