Asp.Net Jquery Ajax Calling Code-Behind Method

ASP.NET jQuery Ajax Calling Code-Behind Method

Firstly, you probably want to add a return false; to the bottom of your Submit() method in JavaScript (so it stops the submit, since you're handling it in AJAX).

You're connecting to the complete event, not the success event - there's a significant difference and that's why your debugging results aren't as expected. Also, I've never made the signature methods match yours, and I've always provided a contentType and dataType. For example:

$.ajax({
        type: "POST",
        url: "Default.aspx/OnSubmit",
        data: dataValue,                
        contentType: 'application/json; charset=utf-8',
        dataType: 'json',
        error: function (XMLHttpRequest, textStatus, errorThrown) {
            alert("Request: " + XMLHttpRequest.toString() + "\n\nStatus: " + textStatus + "\n\nError: " + errorThrown);
        },
        success: function (result) {
            alert("We returned: " + result);
        }
    });

calling code behind c# method from jquery ajax

Try to send data as JSON:

$('#btn_Submit').click(function () {

   var request = {
     Guardian : $('#txtGuardianName').val(),
     CIFID : $('#txtCIFID').val(),
     EmploymentType : encodeURIComponent($('#cmbEmploymentType').val(),
     NatureIncome : encodeURIComponent($('#cmbIncomeNature').val()),
     Occupation : encodeURIComponent($('#cmbOccupation').val()
   };    

   var strRequest = JSON.stringify(request);  

   $.ajax({
            url: 'ajaxExecute.aspx/CAO2',
            data: strRequest,
            dataType: "json",
            contentType: "application/json",  
            cache: false,
            context: document.body,
            type: 'POST',
            success: function (response) {

            }
        });
   }

can I use ajax to call C# code behind method?

You can use the WebMethod attribute

Pagemethods in asp.net

Using jQuery AJAX to call ASP.NET function in control code-behind instead of page code-behind

You can't...WebMethods have to be in WebServices or Pages, they cannot be inside UserControls.

Think about it a different way to see the issue a bit clearer...what's the URL to a UserControl? Since there's no way to access them you can't get at the method directly. You could try another way perhaps, maybe a proxy method in your page?

Calling of Code Behind method from ajax function Jquery not working

Try using {} for your data, "{}" will be considered as string or don't include data parameter if you are not sending any parameters.

onDelete: function (item) {
      //Some Code
       $.ajax({
           type: "POST",
           url: 'Page_Name.aspx/callmethod',
          // data: "{}",
              data: {}, 
           contentType: "application/json; charset=utf-8",
           dataType: "json"
       });
    }

Here

call asp.net web forms code behind using ajax

After hours of trying and research I found the solution and here are my full code:

 $(document).ready(function () {
        $('#Text2').change(function () {
            var ema = $('#Text2').val();
            $.ajax({
                type: "POST",
                url: "Login.aspx/GetDoublicate",
                // data: '{"email":'+$('#Text2').val()+ ',}',
                data: JSON.stringify({ "email":ema }),
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (response) {
                    //   console.log(response.d);
                    if(response.d == true)
                    { alert("doublicate email discovered"); }
                else {alert("Ok, go on")};
                }
                ,
                error: function (xhr, err) { alert("readyState: " + xhr.readyState + "\nstatus: " + xhr.status + "\nresponseText: " + xhr.responseText); }

            });
            

        })

    })

noting that jSon parameters must be same name of function called parameter.

here asp code:
[WebMethod]
public static bool GetDoublicate(string email)
{

        SqlConnection con = new SqlConnection(connectionString);
        con.Open();
        string sqltext = "select id from CoAuthor where email='" + email + "'";
        SqlCommand cmd = new SqlCommand(sqltext, con);
        SqlDataReader dr= cmd.ExecuteReader();
        while (dr.Read())
        {
            return true;
        }
        con.Close();
        return false;
        

    }

Jquery AJAX doesn't call a code behind method

You don't need to convert result to JSON, it is auto. serialized to JSON

 [WebMethod()]
    public static object GetData()
    {
        return (new { NewTotal = "777", OfType = "love" });
    }

On JS, refer to newTotal like this

data.d.NewTotal

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