Why isn't my ajax call working?

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VS2013

Hi guys.
Admitting that I'm not familiar with client-side coding..
I'm trying to get this ajax call working, but I can't figure it out..

JavaScript

function ShowAlert()
{
  $.ajax(
    {
      type: "POST",
      url: "DownladData.aspx/Alert",
      data: "{}",
      contentType: "application/json; charset=utf-8",
      datatype: "json",
      statusCode: {
        404: function ()
        {
          alert('Method not found!');
        }
      },
      success: function (msg) {
        alert('Everything is ok!');
      },
      error: function (msg) {
        alert('Error!!!')
      }
    });
}

While this is the C# code

C#

[WebMethod]
  public static void Alert()
  {
  }

And this is the button through which I make the ajax call

ASP.NET

<input type="button"  runat="server"  önclick="ShowAlert();" value="Alert" />

This routine doesn't do anithing, but I'd except an alert with the Everything is ok message, instead of an Error!!!.

Using chrome debugger, I get this message:

Failed to load resource: the server responded with a status of 404 (Not Found) http://localhost/AdminPages/DownloadData.aspx/Alert

where Alert() is the WebMethod in the DownloadData.aspx.cs file.

Any suggestion?

Thank you very much!

Posted 9-Sep-14 22:26pm

leotato008

Updated 9-Sep-14 22:29pm

v2

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Comments

Sinisa Hajnal 10-Sep-14 4:38am

What does your error msg say? from error: function(msg) try alert (msg) instead of alert("Error")

leotato008 10-Sep-14 4:52am

I'm getting two alerts: first of all the generic one 'Error!!!' and then the specific 404 one ('Method not found')

Thanks7872 10-Sep-14 4:41am

Try rebuilding the project again. I don't see any issue as of now.

Sinisa Hajnal 10-Sep-14 5:54am

You have a typo Downl - a - d instead of Downl -oa -d at least in the code above...

Also, you might add AdminPages to the path if the error persists
url: "AdminPAges/DownladData.aspx/Alert",

2 solutions

Solution 1

My guess would be that your error handling is wrong. I'm not familiar with statusCode option (maybe it was added recently?)

This is how I would check for the error status:

script

.
.
.
error: function (xhr, status, msg)
(jqXHR.status && xhr.status == 404){
                    alert(xhr.responseText); /* or your custom text*/
               }else{
                   alert("Something else went wrong");
               }

Several variations and even error maps here[^]

If this helps, please accept the solution so other may find it.

Posted 9-Sep-14 22:48pm

Sinisa Hajnal

Updated 9-Sep-14 22:50pm

v4

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leotato008 · Accepted Answer · 2014-09-10T02:10:00

Well, I've found the solution to this puzzle.

I'll report what I've discovered to help all of the other people.

My Ajax/Jquery code was ok.

The method must be put in the codebehind of an .aspx page (not sure if it's working even if put behind a master page) and it has to be declared as public.

You can call another method from within the aspx.cs method called via jquery/ajax, as you would do with any other external dll call.

Thx everybody for your help.