WebMethod access page control and set value - asp.net

Question

My page name
public partial class AtamaGorevDegistir : System.Web.UI.Page
{}
My webmethod ajax side
var path = getLocation(location.href);
$.ajax({
type: "POST",
url: path.pathname + "/KisiBilgiDoldur",
// data: "{" + str + "}",
contentType: "application/json; charset=utf-8",
// dataType: "json",
success: function (data) {
var dd = data.d;
$('.modal-dialog').css({ width: '85%' });
$('#AtamaModal').modal({ show: true });
}
});
My webmethod
[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public static string KisiBilgiDoldur(string KayitID, string TeklifID)
{
AtamaGorevDegistir atama = new AtamaGorevDegistir();
atama.AtananSuren.Value = "123";
return null;
}
But my problem my Control is null . But i can access this method but didnt set value and give error message. Why this happened?

Answer 1

WebMethod and ScriptMethod can't access the controls collection of the calling page. Think of it as outside the normal Web Forms lifecycle. When you use AJAX, you need to pass all data to the server side method it needs, and your server side should return all data that the client side needs. Then the client side should take that returned data and manipulate the DOM as necessary to display the result.
In your WebMethod, return the data instead of trying to assign it to a control, remove the return null;.
[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public static string KisiBilgiDoldur(string KayitID, string TeklifID)
{
return "123";
}
In your client side success handler, get the returned data and set the value of the control using JavaScript.
var path = getLocation(location.href);
$.ajax({
type: "POST",
url: path.pathname + "/KisiBilgiDoldur",
// data: "{" + str + "}",
contentType: "application/json; charset=utf-8",
// dataType: "json",
success: function (data) {
var dd = data.d;
$('.modal-dialog').css({ width: '85%' });
$('#AtamaModal').modal({ show: true });
//set control value to data.d here
}
});

Answer 2

You don't set the control value with a webmethod. Your return a value and from the api and do something with it, in the browser. Working with webmethods are not like webforms. The value you return in your webmethod is null... you're setting that null value into 'dd' in js, but you don't do anything with it. When you get your value back from the webmethod you need to do something with it. try 'alert(data.d)' in your success callback to see what i mean. Then $('#elm').text(data.d) if you want it on the page.

Answer 3

You should add parameters to data.
$.ajax({
type: "POST",
url: path.pathname + "/KisiBilgiDoldur",
data:JSON.stringify({ KayitID: '1', TeklifID:'2' }),
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (data) {
var dd = data.d;
$('.modal-dialog').css({ width: '85%' });
$('#AtamaModal').modal({ show: true });
}
});