Extracting data from JSON with ASP.Net web service

Question

I am trying unsuccessfully to extract the formatted_address property.

The following web service logs the JSON below to the console. I cannot get the formatted address using returnedData.d.results[0].formatted_address.

 $.ajax({
        type: "POST",
        url: "ReportIncident.aspx/ReverseGeocode",
        data: "{latitude:" + latitude + ",longitude:" + longitude + "}",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (returnedData)
        {
          console.log(returnedData);
        }
    });

The format of the json is the exact same as the format over here at Google.

Edit Darin pointed out that I was contradicting myself: the web service wraps up everything in the link above in a d object, I failed to mention that.

enter image description here

Further edit Here is the web service:

[WebMethod]
        public static string ReverseGeocode(decimal latitude, decimal longitude)
        {
            // Create the web request  

            string url = "http://maps.googleapis.com/maps/api/geocode/json?latlng=" + latitude + "," + longitude +"&sensor=true";
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;

            // Get response  
            using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
            {
                // Get the response stream  
                StreamReader reader = new StreamReader(response.GetResponseStream());

                return reader.ReadToEnd();
            }
        }

and here is the javascript:

/Gets the current location of the user
function getLocation()
{
    if (navigator.geolocation)
    {
        navigator.geolocation.getCurrentPosition(showPosition);
    }

}

function showPosition(position)
{
    var latitude = position.coords.latitude;
    var longitude = position.coords.longitude;

    $.ajax({
        type: "POST",
        url: "ReportIncident.aspx/ReverseGeocode",
        data: "{latitude:" + latitude + ",longitude:" + longitude + "}",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (returnedData)
        {
            alert(returnedData.d[0].results[0].formatted_address);
            console.log(returnedData);
        }
    });

yes, it is an ASP.Net web service: see encosia.com/a-breaking-change-between-versions-of-aspnet-ajax — Lee
– Lee, Commented Jun 28, 2012 at 13:35
I know this. It's just that you are contradicting yourself in the question when you are saying that the JSON looks exactly the same as the link you have shown. So are you getting an error when you try to access returnedData.d.results[0].formatted_address? — Darin Dimitrov
– Darin Dimitrov, Commented Jun 28, 2012 at 13:35
@Tamil If i use returnedData.d.results, I then get a results is 'undefined' error — Lee
– Lee, Commented Jun 28, 2012 at 13:47

gen_Eric · Accepted Answer · 2012-06-28 13:38:43Z

1

Have you tried using returnedData.results[0].formatted_address without the .d. node. That does not exist!

edited Jun 28, 2012 at 13:38

gen_Eric

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answered Jun 28, 2012 at 13:33

thomas

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Comments

MCSI · Accepted Answer · 2012-06-28 13:35:44Z

0

remove the ".d"

returnedData.results[0].formatted_address

but doing this you are always getting the first node only

answered Jun 28, 2012 at 13:35

MCSI

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1 Comment

MCSI Over a year ago

what do you get if you do : console.log(returnedData.d); ?

Lee · Accepted Answer · 2012-07-05 09:49:06Z

0

The answer to this issue turns out to be that the web service is returning a string, instead of json. The built-in javascript serializer does not get used. The eval keyword or something more secure needs to be used. As it happens I ended up using the Google Maps Javascript API and that was much easier anyway.

answered Jul 5, 2012 at 9:49

Lee

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