Calling a 'WebMethod' with jQuery in ASP.NET WebForms

Make sure that you have enabled page methods in your ScriptManager element:

<asp:ScriptManager ID="scm" runat="server" EnablePageMethods="true" />

and that you have canceled the default action of the button by returning false inside the onclick handler, otherwise the page performs a full postback and your AJAX call might never have the time to finish. Here's a full working example:

<%@ Page Language="C#" %>
<script type="text/c#" runat="server">
[System.Web.Services.WebMethod]
public static string search()
{
    return "worked";
}
</script>

<!DOCTYPE html>
<html>
<head id="Head1" runat="server">
    <title></title>
</head>
<body>
    <form id="Form1" runat="server">
        <asp:ScriptManager ID="scm" runat="server" EnablePageMethods="true" />
        <button id="btnSearch" onclick="search(); return false;" >Search</button>
    </form>

    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
    <script type="text/javascript">
        function search() {
            $.ajax({
                type: 'POST',
                url: '<%= ResolveUrl("~/default.aspx/search") %>',
                data: '{ }',
                contentType: 'application/json; charset=utf-8',
                dataType: 'json',
                success: function (msg) {
                    alert(msg.d)
                }
            });
        }
    </script>
</body>
</html>

Another possibility is to subscribe to the click handler unobtrusively:

<button id="btnSearch">Search</button>

and then inside a separate javascript file:

$('#btnSearch').click(function() {
    $.ajax({
        type: 'POST',
        url: '<%= ResolveUrl("~/default.aspx/search") %>',
        data: '{ }',
        contentType: 'application/json; charset=utf-8',
        dataType: 'json',
        success: function (msg) {
            alert(msg.d)
        }
    });
    return false;
});

You might also notice the usage of the msg.d property inside the success callback which ASP.NET uses to wrap the entire response into as well as the usage of the ResolveUrl method to properly generate the url to the page method instead of hardcoding it.

A more optimised call will be

function search() {
    $.ajax({
        type: "POST",
        url: '<%= ResolveUrl("~/ProcessAudit/req_brws.aspx/search") %>',
        data: "{}",
        contentType: "application/json",
        success: function (msg) {
            msg = msg.hasOwnProperty("d") ? msg.d : msg;
            alert(msg);
        }
    });
}

No need to provide a asp:ScriptManager at all.

Resource: http://encosia.com/using-jquery-to-directly-call-aspnet-ajax-page-methods/

Your current button is causing a full postback. Simply add a type="button" to your button to avoid this.

 <button id = "btnSearch" type="button" onclick = "search()" >Search</button>

-Shazzam yo

Calling a 'WebMethod' with jQuery in ASP.NET WebForms

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