unable to call a c# method from javascript using ajax

Question

I have a c# method which I would like to call on client side. I used ajax calling to achieve this

function ValidateIfDuplicate()
        {
            debugger

            var billtext = $("#ctl00_ContentPlaceHolder2_textBoxBillNumber").val();
            var retailer= $("#ctl00_ContentPlaceHolder2_dropDownListRetailers").val();
            var billdate = $("#ctl00_ContentPlaceHolder2_textBoxBillDate").val();

            if (billtext == "")
            {
                alert("Bill Number cannot be left empty");
                return false;
            }
            else if (retailer == 0) {
                alert("Please select a Retailer");
                return false;
            }
            else if (billdate == '') {
                alert("Date cannot be left empty");
                return false;
            }
            else if (billtext != '' && retailer != '' && billdate != '')
            {


                    $.ajax({
                        Type: "POST",
                        url: "CAInvoiceEntry.aspx/ValidateDuplicateEntry",
                        contentType: "application/json; charset=utf-8",
                        data: { billtext1: billtext, billdate1: billdate, retailer1: retailer },
                        dataType: "json",
                        success: function (result) {
                            debugger
                            alert(result.d);
                        }
                    });

                return true;
            }
        }

and this is my c# method

[System.Web.Script.Services.ScriptService] 
public partial class CAInvoiceEntry: BaseClass
{
    [WebMethod, ScriptMethod()]
        public static int ValidateDuplicateEntry(string billtext1, string billdate1, string retailer1)
        {
            string validatebill = objCAInvoiceEntry.validatebilldate(textBoxBillNumber.Text, billdate1.ToString(), ViewState[AppConstants.UploadedBy].ToString(), dropDownListRetailers.SelectedValue);
            if (validatebill == "1")
            {

                return 1;
            }
            else
                return 0;
        }
}

but the web method is not fired. I have also tried using pagemethods.methodname() as an alternative(by registring the script with enablepagemethods=true) but with no effect.

If someone can guide me on where i am doing it wrong? Just to be clear.. in the below image you can see the breakpoint execution, where the ajax call gets skipped.

try adding this [System.Web.Script.Services.ScriptService] on the class in which this method is located — Sujit.Warrier
– Sujit.Warrier, Commented May 17, 2016 at 12:52
@guruprasad rao There is nothing that i get on the browser, when I debug and verify, the control doesn't pass to the method. — WorksOnMyLocal
– WorksOnMyLocal, Commented May 18, 2016 at 5:19
Then this purely WebMethod issue. Try searching on how you can call WebMethod through javascript.. You will get some solution.. — Guruprasad J Rao
– Guruprasad J Rao, Commented May 18, 2016 at 5:24
@GuruprasadRao I went through all the websites and i find no difference in the way they have mentioned and the way i have called the method. — WorksOnMyLocal
– WorksOnMyLocal, Commented May 18, 2016 at 6:36

KanisXXX · Accepted Answer · 2016-05-18 07:05:16Z

1

I was facing similar issue today. In my case i had RouteConfig in App_start folder, So i solved my problem by commenting this line

//settings.AutoRedirectMode = RedirectMode.Permanent;

which was the cause of the problem.

also Your web method needs to be public and static.

something like

public static int MethodName()
{
    // your method
}

edited May 18, 2016 at 7:05

answered May 17, 2016 at 13:15

KanisXXX

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2 Comments

WorksOnMyLocal Over a year ago

i am not using MVC, so in my case this doesn't apply. Thank you. if any other suggestion it would be great

KanisXXX Over a year ago

well i also wasn't using MVC, you can also use RouteConfig in Webforms, however for your issue please check Updated Answer

Vamshi Krishna Rao N · Accepted Answer · 2016-05-26 10:04:07Z

There seems to be as issue with the way you are passing parameters through ajax. Try this.

if (billtext != '' && retailer != '' && billdate != '')
            {

               debugger

               $.ajax({
                   type: "POST",
                   url: "CAInvoiceEntry.aspx/ValidateDuplicateEntry",
                   data: "{ billtext1:" + "'" + billtext + "'" + ", billdate1:" + "'" + billdate + "'" + ", retailer1:" + "'" + retailer + "'" + "}",
                   contentType: "application/json; charset=utf-8",
                   dataType: "json",
                   async: true,
                   cache: false,
                   success: function (msg) {
                       if (msg == "1")
                                       alert("Already exists");
                                   else
                                       alert("valid");
                   },
                   error: function (msg) {
                       debugger;
                       alert(msg);
                   }
               })
               return false;


            }

Bert Cushman · Accepted Answer · 2016-05-24 20:35:24Z

0

You have a tiny typo in your javascript. Remember that javascript is case-sensitive. You are passing in:

Type: "POST"

But in fact you should be passing in:

type: "POST"

If you use F12 on the Network tab, you will noticed that your current AJAX call is making a GET request, not a POST request.

edited May 24, 2016 at 20:35

answered May 24, 2016 at 18:53

Bert Cushman

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