// monitor wifi signal strength
navigator.system.get("Network", function(connection) {

    // helper that updates the dom
    function updateStatus(conn) {
        var msg = "Wireless "+conn.essid+" at "+(conn.signalStrength*100)+"%";
        x$('#network-status').html(msg);
    }

    // only watch the wifi setting
    if (connection.type===connection.TYPE_IEEE802_11)
        navigator.system.watch("WifiConnection", updateStatus);

}, null);