jquery ajax call to asp.net webservice

Question

I am trying to call webservice method from Jquery ajax.

Here is my jquery code,

function abc() {

        alert("");
        $.ajax({
            type: "Get",
            url: "abc.asmx/HelloWorld",
            data: "{}",
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            error: function (errorThrown) {
                console.log(errorThrown.d); 
                alert(errorThrown + "what's wrong?");
            },
            success: function (msg) {
                console.log(msg.d);
                alert(msg.d);
                return false;
                // Do something interesting here.
            }
        });
        return false; }

and my web method is following,

 [WebMethod]
public string HelloWorld() {
    return "Hello World";
}

the jquery error event is keep occuring. Not sure why it's happening

any help will be appreciated

thanks

I checked it's giving "XMLHTTPOBJECR" and when i use errorThrown.d it's giving "undefined" — fc123, Aug 26 '14 at 13:32
`contentType: "application/json; charset=utf-8",` makes no sense. You are making a GET request. There is no request body to describe the content type of. — Quentin, Aug 26 '14 at 13:35
`dataType: "json"` - you are overriding the content-type of the response and parsing it as JSON. `public string HelloWorld() { return "Hello World"; }` does not appear to return JSON. — Quentin, Aug 26 '14 at 13:36
Take a look at these 2 answers: http://stackoverflow.com/questions/8405458/return-json-data-from-asmx-web-service and http://stackoverflow.com/questions/18244696/how-to-return-json-with-asp-net-jquery — frenchie, Aug 26 '14 at 15:31

score 1 · Accepted Answer · edited Aug 26 '14 at 15:25

1

I was missing the [ScriptService] attribute on my WebService class, similar to this:

[ScriptService]
public class MyWebService : System.Web.Services.WebService 
{
    [WebMethod]
    public string HelloWorld() {
        return "Hello World";
    }    
}

Now it's working perfectly.

edited Aug 26 '14 at 15:25

Nope

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answered Aug 26 '14 at 14:53

fc123

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I added some sample code how this might look like so future users with less knowledge in the area may find this useful. If this is not how you used it, please add your sample code showing the solution. – Nope Aug 26 '14 at 15:26

score 0 · Answer 2 · edited May 23 '17 at 11:51

0

Try this as you are expecting a JSON result from server and adding ScriptMethod will enable javascript to call your method

[WebMethod]
[ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]
public string HelloWorld()
{
 return "Hello World";
}

Also check How to let an ASMX file output JSON

edited May 23 '17 at 11:51

Community

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answered Aug 26 '14 at 13:31

Murali Murugesan

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@xyz, Updated my answer. Just remove `.d` – Murali Murugesan Aug 26 '14 at 13:37
@xyz, If you are running in firefox, check the console and see the detailed information about the error. – Murali Murugesan Aug 26 '14 at 13:41

score -2 · Answer 3 · answered Aug 26 '14 at 13:32

-2

I guess that you need to specify what kind of request the method will response.

something like this

[HttpGet]
public string HelloWorld() {
    return "Hello World";
}

Or use the convention

public string Get() {
    return "Hello World";
}

answered Aug 26 '14 at 13:32

rcarvalho

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jquery ajax call to asp.net webservice

3 Answers3