Fetch sample

(function () {
    "use strict";

    document.addEventListener('deviceready', onDeviceReady.bind(this), false);

    function onDeviceReady() {
        getData()
            .then(f=>console.log(f),
                  e=>console.log(e.message));
    };

    function getData() {
        return new Promise((resolve, reject) => {
            fetch('./data/somedata.json')
                .then(function (response) {
                    return response.json().then(function (json) {
                        resolve(json);
                    }).catch(e=>reject(e));
                }).catch(e=>reject(e));
        });
    }
})();