ASP.NET JSON WebService Port to MVC Controller

I want to learn a bit more about JQuery serialization so I worked though this working example.

I got the ASP.NET Web Service solution up and running no problem.

I then ported it over to a MVC solution.

The first thing I did was to set up the controller and the routing to handle incoming requests – basically replacing the web service from the original solution:

Here is the controller:

    public class WeatherController : Controller

    {

        private readonly static string FindNearByWeatherUrl =

        "http://ws.geonames.org/findNearByWeatherJSON?lat={0}&lng={1}&username={2}";

 

        public JsonResult GetWeatherByLocation(double latitude, double longitude)

        {

            JsonResult jsonResponse = new JsonResult();

 

            string formattedUri = String.Format(CultureInfo.InvariantCulture, FindNearByWeatherUrl, latitude, longitude, "fatbgr");

            Uri serviceUri = new Uri(formattedUri, UriKind.Absolute);

            HttpWebRequest httpWebRequest = WebRequest.Create(serviceUri) as HttpWebRequest;

            if (httpWebRequest != null)

            {

                HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();

                string readerResponse = string.Empty;

                using (StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream()))

                {

                    readerResponse = streamReader.ReadToEnd();

                }

 

                jsonResponse.Data = readerResponse;

               

            }

            return jsonResponse;

        }

    }

 

Here is the routing:

            routes.MapRoute(

                "WeatherRoute",

                "Weather/GetWeatherByLocation/{latitude}/{longitude}",

                new { controller = "Weather", action = "GetWeatherByLocation"}

            );

 

 

And here is the javascript that I use to call the controller:

        function CallService() {

            var latitude = "35.797153";

            var longitude = "-78.886546";

            var postData = { latitude: latitude, longitude: longitude };

            $.ajax({

                type: "POST",

                url: "/Weather/GetWeatherByLocation",

                data: postData,

                dataType: "json",

                success: function (msg) {

                    GetWeather_Success(msg);

                }

            });

        }

 

 

Everything is working fine in terms of the Json exchange – Wahoo!

However, I was blindsided by the Jquery selectors.  When I replace the hard-coded values for latitude and longitude with some JQuery, the variables are null:

            var latitude = $("txtLatitude").val;

            var longitude = $("txtLongitude").val;

 

Here is how the controls are created on the form

    <p>

        <input type="text" id="txtLatitude"  value = "35.797153" />

        <input type="text" id="txtLongitude" value = "-78.886546" />

        <input type= "button" value="Get Weather Info" onclick="CallService();" />

    </p>

 

Note that I also try and stuff the result set into the div – but that also is not being recognized

$("#divResult").html = e.toString();

 

I am at a loss – why aren’t the JQuery selectors working???

 

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One Response to ASP.NET JSON WebService Port to MVC Controller

  1. James says:

    Update – I am a coconut head. I am treating the javascript functions like properities and they are silently failingChanging$("#divResult").html = e.toString();To$("#divResult").html() = e.toString();Did the trick

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