Having trouble reaching a webmethod using JavaScript

I attempted to create a basic web method that can be accessed from JavaScript, but unfortunately I am encountering difficulties.

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
    <script type="text/javascript">


        $(document).ready(
        function test() {
            var x = PageMethods.MyMethod();
            alert(x.toString());
        })
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true" EnablePartialRendering="true">
        </asp:ScriptManager>
    </div>
    </form>
</body>
</html>

The code behind is as follows:

 [WebMethod]
        public static string MyMethod()
        {
            return "Hello";
        }

The variable x appears to be null. I am struggling to identify the issue. Any assistance or guidance would be greatly appreciated. Thank you in advance.

Answer №1

To handle the response from the web method, you should create a callback function:

    $(document).ready(
    function test() {
        PageMethods.MyMethod(myMethodCallBackSuccess, myMethodCallBackFailed);
    })

    function myMethodCallBackSuccess(response) {
        alert(response);
    }

    function myMethodCallBackFailed(error) {
        alert(error.get_message());
    }

If needed, you can also pass arguments to the method before specifying the success and failure callbacks.

Note: The failed callback is optional but can be included if necessary.

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