Store Javascript values to SQL Server Database

Question

I'm trying to store some javascript variables to sql server database. But when I'm running the code, an alert is displayed saying Internal server error.

window.onload = function () 
{ codeLatLng(); SaveUserLocation(); return false }
        /*===========================================================*/
        function SaveUserLocation() {
                //Jquery ajax call to server side method
                $.ajax({
                    type: "POST",
                    dataType: "json",
                    contentType: "application/json; charset=utf-8",
                    //Url is the path of our web method (Page name/function name)
                    url: "FriendHomePage.aspx/SaveFriendLocation",
                    //Pass paramenters to the server side function
                    data: "{'LocationName':'" + userLocationName + "', 'UserID':'" + myUserID + "'}",
                    success: function (response) {
                        //Success or failure message e.g. Record saved or not saved successfully
                        if (response.d == true) {
                            alert("Record saved successfully");
                        }
                        else {
                            alert("Record could't be saved");
                        }
                    },
                    error: function (xhr, textStatus, error) {
                        //Show error message(if occured)
                        alert("Error: " + error);
                    }
                });
            }




[WebMethod]
public static bool SaveFriendLocation(string LocationName, int UserID)
{
    bool status;

    using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["FTSCS"].ConnectionString))
    {
        string sql = "INSERT INTO tblLocation (LocationName,UserID) VALUES (@LocationName,@UserID)";
        using (SqlCommand cmd = new SqlCommand(sql, con))
        {
            cmd.CommandType = CommandType.Text;
            cmd.Parameters.AddWithValue("@LocationName", LocationName);
            cmd.Parameters.AddWithValue("@UserID", UserID);
            if (con.State == ConnectionState.Closed)
            {
                con.Open();
            }
            Int32 retVal = cmd.ExecuteNonQuery();
            if (retVal > 0)
            {
                status = true;
            }
            else
            {
                status = false;
            }
            return status;
        }
    }
}

Answer 1

The error is most likely related to the fact you aren't passing up a valid JSON string ie { 'property': 'value' } .

It's recommended you use JSON.stringify (or equivalent) when serializing JSON

var data = { LocationName: userLocationName, UserID: myUserID };
...
$.ajax({
    ...
    data: JSON.stringify(data)
});

Answer 2

I believe in such situations you should turn on debug mode set break point and find out a real problem. If you can't resolve your real problem you can post a question here. Your question looks ambiguous because of possible errors:

• webmethod doesn't receive input data
• configuration settings are not valid
• different SQL issues