the getWeatherFromLocation function

getWeatherFromLocation.js

    function getWeatherFromLocation(lat, lon) {
        return new WinJS.Promise(function (complete, error, process) {
            WinJS.xhr({ url: "http://api.wunderground.com/api/" + apiKey + "/conditions/q/" + lat + "," + lon + ".json" })
            .then(function (xhr) {
                var result = JSON.parse(xhr.responseText).current_observation;

                var condition = {
                    icon: result.icon_url,
                    temp: result.temp_c,

                    location: result.display_location.full
                };

                complete(condition);
            }, function (err) {
                error(err);
            });
        });
    }