Windows 10 JavaScript Example which detects Internet Connection Properties

internetconnectivity.js

window.addEventListener("DOMContentLoaded", (ev) => {
    if (typeof Windows !== 'undefined') {
        var profile = Windows.Networking.Connectivity.NetworkInformation.getInternetConnectionProfile();
        var connectivity = profile.getNetworkConnectivityLevel();

        document.getElementById("connectionstatus").innerHTML = connectivity;
        document.getElementById("hasinternet").innerHTML = (connectivity == Windows.Networking.Connectivity.NetworkConnectivityLevel.internetAccess);
        document.getElementById("islan").innerHTML = profile.isWlanConnectionProfile;
        document.getElementById("iswan").innerHTML = profile.isWwanConnectionProfile;
    } else {
        document.getElementsByTagName("body")[0].innerHTML = "Load within Windows Web App.";
    }
});