DaniWeb IT Discussion Community - Problem with responseText in Safari, Chrome and IE

Hi!

Looks like I'm running into similar problem the previous poster had run into..

I am receiving an empty response when calling a web method using asp.net in Chrome but not IE nor FF. I get this behavior using the ASP PageMethod.func as well as using jquery ajax call.

I can 'fix' the symptom by adding a delay sleep call on the server which makes me believe code is just plain wrong somewhere. I have the webkit fix so that Chrome is using webkit (see first line of log).

I have created a near minimal test case. The log of pressing each button from left to right is shown. Basically with out a sleep call on the server the load fails > 95% of the time. With a sleep(0) call its 50% and with a large sleep 1 sec it rarely (if ever?) fails.

If I remove the sleep and turn on Fiddler it never fails. Something like the response not getting flushed??

Is there something obviously wrong with the test case or is this a bug.

Thanks!!
Chris

Log:

0: Sys.Browser: [object Object], 530.5, WebKit

1: btnA -1

2: waiting for response now

3: btnJQA -1

4: waiting for response now

5: Result = EMPTY, textStatus =success

6: btnA 0

7: waiting for response now

8: Result = OnClick(.NET, page method, 0):  82 7/10/2009 1:01:01 PM

9: btnJQA 0

10: waiting for response now

11: Result = EMPTY, textStatus =success

12: btnA 1000

13: waiting for response now

14: Result = OnClick(.NET, page method, 1000):  84 7/10/2009 1:01:07 PM

15: btnJQA 1000

16: waiting for response now

17: Result = {"d":"OnClick(jquery, ajax, 1000):  85 7/10/2009 1:01:12 PM"}

Page Code:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="AjaxTest.aspx.cs" Inherits="PA.AjaxTest" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >

<head id="Head1" runat="server">

    <title></title>

    <script type="text/javascript" src="js/jquery-1.3.2.js"></script> 

    <script type="text/javascript">



        var iCount = 0;

        function log(s) {                           

            var l = $('#taLog');

            l.get()[0].value += iCount++ + ': ' + s + '\n';

            l.attr({ scrollTop: l.attr("scrollHeight") });

        }



        function btnA_Click(iMilliSec) {

            log("btnA " + iMilliSec);

            PageMethods.OnClick(".NET", "page method", iMilliSec,

            function(result, userContext, methodName) {

                log('Result = ' + ((result != null) ? result : 'result was null'));

            },

            function(error, userContext, methodName) {

                log('PM Response Error: ' + (error != null ? error.get_message() : "no_msg") + '\n\t' + userContext + '\n\t' + methodName);

            });



            log("waiting for response now");

        }



        function json_parse(data) {

            return (typeof (JSON) !== 'undefined' && typeof (JSON.parse) === 'function') ? JSON.parse(data) : eval('(' + data + ')');

        }



        function btnJQA_Click(iMilliSec) {

            log("btnJQA " + iMilliSec);

            $.ajax({

                type: "POST",

                url: "AjaxTest.aspx/OnClick",

                data: "{'s1': 'jquery', 's2': 'ajax', 'iMilliSec': '" + iMilliSec + "'}",

                timeout: 3000,

                cache: false,

                async: true,//false,

                //Connection: 'close',

                contentType: "application/json; charset=utf-8",

                //dataType: "json",  bypass eval of response for now

                dataFilter: function(data) {

                    return data;                    

                },

                success: function(msg, textStatus) {

                    log('Result = ' + (msg == '' ? 'EMPTY, textStatus =' + textStatus : msg));

                },

                error: function(XMLHttpRequest, textStatus, errorThrown) {

                    log('Got an error = ' + (textStatus != null) ? textStatus : "no textstatus");

                }

            });

            log("waiting for response now");

        }



        function btnLoopA_Click() {}

        function btnLoopJQA_Click() { }

        

   </script>    



</head>

<body>

    <form id="form1" runat="server">

    <div>

        <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">

            <Scripts>

                <asp:ScriptReference Path="~/js/webkit.js" />

            </Scripts>

        </asp:ScriptManager>                  

       

        <input id="btnA" type="button" value="btnA" onclick='btnA_Click(-1)'/>       

        <input id="btnJQA" type="button" value="btnJQA" onclick='btnJQA_Click(-1)'/>           

        <input id="btnA_S0" type="button" value="btnA_0_sec" onclick='btnA_Click(0)'/>       

        <input id="btnJQA_S0" type="button" value="btnJQA_0_sec" onclick='btnJQA_Click(0)'/>           

        <input id="btnA_S1" type="button" value="btnA_1_sec" onclick='btnA_Click(1000)'/>       

        <input id="btnJQA_S1" type="button" value="btnJQA_1_sec" onclick='btnJQA_Click(1000)'/>                   

        <input id="btnLoopA" type="button" value="btnLoopA" onclick='btnLoopA_Click()'/>   

        <input id="btnLoopJQA" type="button" value="btnLoopJQA" onclick='btnLoopJQA_Click()'/>   

        

        <textarea id="taLog" cols="120" rows="15" style='position: fixed; left: 10px; bottom: 10px; right: 10px'></textarea>    

        

        <script type="text/javascript">

            log('Sys.Browser: ' + Sys.Browser.agent + ", " + Sys.Browser.version + ", " + Sys.Browser.name);

        </script>            

     </div>

    </form>

</body>

</html>

Server Code

using System;

using System.Web;

using System.Web.UI;

using System.ServiceModel.Web;

using System.Web.Services;



namespace PA

{

    public partial class AjaxTest : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e) {}

        static int __iCounter = 0;

        [WebMethod]        

        public static string OnClick(string s1, string s2, int iMilliSec)

        {

            if (iMilliSec >= 0)

                System.Threading.Thread.Sleep(iMilliSec);



            string sRet = "OnClick(" + s1 + ", " + s2 + ", " + iMilliSec + "):  " + __iCounter + " " + DateTime.Now.ToString();

            __iCounter++;

            

            return sRet;

        }    

    }

}