Accessing WCF REST endpoint using Ajax and transmitting data in JSON format

I have developed a Rest service in WCF (demo), which provides me with the following output:

{"GetEmployeeJSONResult":{"Id":101,"Name":"Sumanth","Salary":5000}}

Now, I have created an ASP.NET website where I am utilizing AJAX JSON to call this rest service...

This is my code:

<script type="text/javascript>
    $(document).ready(function () {
        var endpointAddress = "http://localhost/SampleService/Service1.svc";
        var url = endpointAddress + "/GetJson";
        $.ajax({
            type: 'GET',
            url: url,
            dataType: 'jsonp',
            contentType: 'application/json',
            data: "{}",
            success: function (result) {
                alert(result.length);
            },
            error:function(jqXHR)
            {
                alert(jqXHR.status);
            }
        });

    });
</script>

You can see that I have accessed the service using both AJAX and getJSON methods.

However, when I try to display the data in an alert, it shows as undefined. I have tried using alert(result.d.length) and

alert(result.d.GetEmployeeJSONResult)
, but they always show as undefined in both methods.

Below is the code for my WCF service:

namespace WcfServiceXmlAndJsonDemo
{
    [ServiceContract]
    public interface IService1
    {
        [OperationContract]
        [WebInvoke(Method="GET",UriTemplate="GetXml",ResponseFormat=WebMessageFormat.Xml,RequestFormat=WebMessageFormat.Xml,BodyStyle=WebMessageBodyStyle.Bare)]
        EmployeeXML GetEmployeeXML();

        [OperationContract]
        [WebInvoke(Method = "GET", UriTemplate = "GetJson", ResponseFormat = WebMessageFormat.Json, RequestFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped)]
        List<EmployeeJSON> GetEmployeeJSON();
    }
}

DataContract for EmployeeJSON:

namespace WcfServiceXmlAndJsonDemo
{
    [DataContract]
    public class EmployeeJSON
    {
        [DataMember]
        public string Name { get; set; }

        [DataMember]
        public int Id { get; set; }

        [DataMember]
        public double Salary { get; set; }
    }
}

Service1.svc.cs:

 namespace WcfServiceXmlAndJsonDemo
 {   
    public class Service1 : IService1
    {    
        public List<EmployeeJSON> GetEmployeeJSON()
        {
            EmployeeJSON json = new EmployeeJSON()    
            {Name="Sumanth",Id=101,Salary=5000.00 };
            return json;
        }
    }
}

Please assist me in resolving this issue.

Thank you for your help.

Krunal

Answer №1

Replace WebInvoke with WebGet and eliminate Method="GET".

Also, when making an AJAX call.

type: 'GET',
url: url,
dataType: 'jsonp',
//contentType: 'application/json', You don't need to specify Content-Type.

Give it a try.

Answer №2

Below is the proposed solution:

function () {
        $.ajax({
            type: "GET",
            async: false,
            contentType: "application/json; charset=utf-8",
            url: 'http:www.svc/Service1.svc/GetJson',
            data: "{ }",
            processData: false,
            dataType: "json",               
            success: function (data) {                    
                var result = data.GetEmployeeJSONResult;
                var id = result.Id;
                var name = result.Name;
                var salary = result.Salary;
                $('#jsonData').html('');
                $('#jsonData').append('<table border="1"><tr><th>Employee ID</th><th>Name</th><th>Salary</th></tr><tr><td>' + id + '</td><td>' + name + '</td><td>' + salary + '</td></tr></table>');

            },
            error: function (xhr) {
                alert(xhr.responseText);
            }
        });
    }

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