How to call webmethod in Asp.net C#

Question

I want to call a web method in asp.net c# application using the following code

Jquery:

jQuery.ajax({
    url: 'AddToCart.aspx/AddTo_Cart',
    type: "POST",
    data: "{'quantity' : " + total_qty + ",'itemId':" + itemId + "}",
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    beforeSend: function () {
                  alert("Start!!! ");
               },
    success: function (data) {
                 alert("a");
              },
    failure: function (msg) { alert("Sorry!!! "); }
    });

C# Code:

[System.Web.Services.WebMethod]
public static string AddTo_Cart(int quantity, int itemId)
{
    SpiritsShared.ShoppingCart.AddItem(itemId, quantity);      
    return "Add";
}

But it always call page_load. How can i fix it?

Answer 1

There are quite a few elements of the $.Ajax() that can cause issues if they are not defined correctly. I would suggest rewritting your javascript in its most basic form, you will most likely find that it works fine.

Script example:

$.ajax({
    type: "POST",
    url: '/Default.aspx/TestMethod',
    data: '{message: "HAI" }',
    contentType: "application/json; charset=utf-8",
    success: function (data) {
        console.log(data);
    },
    failure: function (response) {
        alert(response.d);
    }
});

WebMethod example:

[WebMethod]
public static string TestMethod(string message)
{
     return "The message" + message;
}