jQuery AJAX发布到asp.net webmethod永远不会被调用？

Question

I am trying to send data from my javascript to an aspx webmethod with ajax. the Success option of ajax post is fired but my web method never getting called. the javascript code is:

 $.ajax({
    type: "POST",
    url: '../About.aspx/GetWFData',
    data: "{sendData: '" + 5 + "'}",
    async: true,
    success: function (result) {
        alert("Bravo");
    },
    error: function (jqXHR, textStatus, errorThrown) {
        alert(textStatus);
        alert(errorThrown);
    }
});

and the webmethod in the code behind is:

 [WebMethod]
    public static string GetWFData(string sendData)
    {
        return String.Format("Hello");
    }

Answer 1

Try to use below code to see if it works.

var params = '{sendData:' + values + '}';
 $.ajax({
    type: "POST",
    url: '../About.aspx/GetWFData',
    data: JSON.stringify(params),
    async: true,
    success: function (result) {
        alert("Bravo");
    },
    error: function (jqXHR, textStatus, errorThrown) {
        alert(textStatus);
        alert(errorThrown);
    }
});

And refer to http://elegantcode.com/2009/02/21/javascript-arrays-via-jquery-ajax-to-an-aspnet-webmethod/ for more info. Try to disable request validation on a page. http://www.asp.net/whitepapers/request-validation