Ajax client-side framework failed to load

Article
2008-01-19

Question

_{Saturday, January 19, 2008 3:09 PM}

When I try to use an UpdatePanel in a webform using Visual Studio.NET 2008 I get "Ajax client-side framework failed to load" error and AJAX Does not work.

How can I fix this????

Thanks

VIEWSOURCE TEXT (See .aspx page below this)

<!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><title>
Untitled Page
</title>
    <script type="text/javascript">

      function pageLoad() {
      }

    </script>
</head>
<body>
    <form name="form1" method="post" action="Default.aspx" id="form1">
<div>
<input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" />
<input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" />
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUJLTcyNDAwNzE3D2QWAgIDD2QWBAIDDw8WAh4EVGV4dAUUMS8xOS8yMDA4IDE6MDg6MDYgUE1kZAIFD2QWAmYPZBYCAgMPDxYCHwAFFDEvMTkvMjAwOCAxOjA4OjA2IFBNZGRk8E5I/hsGRi2V7K5rHzw0HdsOjLc=" />
</div>

ASPX PAGE CODE

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="AJAX_Default" %>

<%@ Register assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" namespace="System.Web.UI" tagprefix="asp" %>

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

<title>Untitled Page</title>

function pageLoad() {

}

</script>

</head>

<body>

<div>

<asp:ScriptManager ID="ScriptManager1" SupportsPartialRendering="True" runat="server"></asp:ScriptManager>

<br />

<asp:Label ID="Label1" runat="server"></asp:Label>

<br />

<asp:UpdatePanel ID="UpdatePanel1" runat="server" RenderMode="Inline">

<asp:Button ID="Button1" runat="server" Text="Button" />

<asp:Label ID="Label2" runat="server"></asp:Label>

</ContentTemplate>

</asp:UpdatePanel>

</div>

</form>

</body>

</html>

All replies (27)

_{Saturday, January 19, 2008 5:28 PM ✅Answered}

I got it. When Icreated the website I used the ASP.NET Reports Website Template instead of the ASP.NET Web Site template.

Each creates a different web.config.

So I copied the Web.Config from the ASP.NET Website into the ASP.NET Reports Website and all works fine!

_{Saturday, January 19, 2008 3:25 PM}

You need to install Ajax Extensions and Ajax ToolKit for .NET 3.5.

Check here : http://www.asp.net/ajax/downloads/

Hope this helps,

Joseph

_{Saturday, January 19, 2008 4:17 PM}

I downloaded the Ajax extensions, but nowhere does it say how to install them.

Can you help? Thanks!

_{Sunday, May 11, 2008 11:05 PM}

I tried the suggestions here and on Experts Exchange, but they did not resolve my problem. It turned out that my URL rewriting (which uses Application_BeginRequest in the global.asax) was the culprit.

This post had the solution: http://weblogs.asp.net/lkempe/archive/2007/08/04/asp-net-ajax-and-url-rewriting-issue.aspx

All I did was add this line:

ScriptManager.GetCurrent(Page).AuthenticationService.Path = "/Authentication_JSON_AppService.axd";

to my MasterPage codebehind in the Page.Load.

_{Friday, December 19, 2008 5:06 AM}

First of all you should check your web.config file.if it is fine then u check your bin folder.you can add system.web.extensions.dll & system.web.extensions.design.dll in bin.if there is still a problen then reconfigure iis setting or you can reinstall iis .if still a problem then burn down your machine and buy one branded .....then it will.......................

_{Thursday, January 29, 2009 1:45 PM}

We are getting this same Ajax error when trying to implement simple code on a server. We have 2 test servers running Windows 2003 and IIS 6.0. On the new server, we were getting this error so created some simple Ajax code and put it in a virtual directory. It works fine on the old test server but gets the Ajax error on the new server. We made sure both servers are running the same framework:

.NET Framework 2.0
    Exact Version: 2.0.50727.1433
    Service Pack: 1
.NET Framework 3.0
    Exact Version: 3.1.21022
    Service Pack: -1
.NET Framework 3.5
    Exact Version: 3.5.21022.8
    Service Pack: 0

We first had 3.5 SP1 on the new test server but since the old server didn't have that, we rolled back to the non SP1 version so the frameworks are identical. Same thing, works fine on old server, not new. The virtual directory's reference folder has:

System.Web.Extensions.Design.dll
System.Web.Extensions.dll

The web.config has the httpHandlers and httpModules sections. Here is the test code:

test.aspx:

EDIT: The file didn't get inserted correctly for some reason but it's just using a simple UpdatePanel with a TextBox and Button inside the ContentTemplate.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="test.aspx.cs" Inherits="test" %>

"-//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">
"server">
    <title>Untitled Page</title>

    <form id="<span" class="st">"form1" runat="server">
    
        <asp:scriptmanager id="<span" class="st">"ScriptManager1" runat="server">
        </asp:scriptmanager>
        <asp:updatepanel id="<span" class="st">"UpdatePanel1" runat="server">
        <contenttemplate>
            <asp:textbox id="<span" class="st">"txttest" runat="server">
            </asp:textbox>

            <asp:button id="<span" class="st">"btntest" runat="server" Text="Button" onclick="btntest_Click" />
            </asp:button>
        </contenttemplate>
    </asp:updatepanel>
    </form>

test.aspx.cs:

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class test : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btntest_Click(object sender, EventArgs e)
    {
        txttest.Text = "Test";
    }
}

We are at a loss as to what to try next. Any help would be greatly appreciated! Thanks!

_{Friday, January 30, 2009 11:39 AM}

Solution found for this generic message with many solutions. Ours was that the AXD extension needed to be added to the IIS Application Extensions dialog.

_{Friday, January 30, 2009 12:55 PM}

I also had to add the axd file extension mapping for the site AND uncheck the "Verify File Exists" option for it.

_{Friday, January 30, 2009 2:00 PM}

Yup, that's right. Funny that we have to go through this. You would think that at least installing framework 3.5 would do that for you.

_{Wednesday, July 1, 2009 5:10 PM}

I also get the same error message, but it happens only to one of our client's machines. They said it started with one machine and it propagated to all the other machines. Its a JavaScript error message thats is popping up on the IE 6.

NOTE:

I think this is not a Server issue because all our other clients does not have this issue. It happens only for one of our clients. It works perfectly fine of all the others.

What might be the problem?

_{Thursday, October 15, 2009 2:46 PM}

Adding AXD extension to the IIS Application Extensions worked for me.

Thanks much!

_{Tuesday, November 17, 2009 5:31 AM}

Hi all. I just ran into the same problem in IE, to fix it I needed to add the following to my Web.Config

</httpHandlers>

</httpModules>

Cheers

_{Monday, November 30, 2009 9:06 AM}

Hey huys,

after struggling for a while, the solution for me was:

rmoving the

scriptpath

="Scripts/Ajax"

in the definition of ScriptManager.

that was the way i did it in .net 2.0, but it seems to be different in 3.5.

_{Tuesday, December 15, 2009 3:09 PM}

Ok.

Microsoft drives me nuts.

I've had this issue and guess what the cause was: the server's DATE was incorrect. (it was set to 2007 due to problems in the CMOS battery)

Go figure.

_{Thursday, April 22, 2010 1:03 PM}

I wonder if someone could please help me with this problem.I am using framework 3.5 and ajaxtoolkit 3.0.30930.

I would like to load ajaxtoolkit javascript files from a directory. I download the scripts from here AJAX Control Toolkit - Script Files Only .

Created two subdirectories on my .net project

\scriptsAJAX\System.Web.Extensions\3.5.0.0\3.5.30729.196\

I copied these two files in the above directory: MicrosoftAjax.debug.js and MicrosoftAjax.js

\scriptsAJAX\AjaxControlToolkit

The above folder has all the script files (*js) etc.. that i download from ajax control toolkit

Now I set the ScriptPath property on ScriptManager to ScriptPath="~/scriptsajax"

<asp:ScriptManager runat="Server" ScriptPath="~/scriptsajax" EnablePartialRendering="true" ID="ScriptManager1" >
<asp:UpdatePanel ID="UpdatePanel1" runat="server">

I have a very sample test page that has DropDownList and CalendarExtender. When I browse the page then I get these errors:

Error: ASP.NET Ajax client-side framework failed to load.

Error: 'Sys' is undefined

Yes I did register <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>

Could someone help me to solve this problem.What files is it missing? Thank you

_{Friday, April 23, 2010 2:25 PM}

I had the same problem and adding the lines to the <httpHandlers> section of web.config as trossr32 wrote fixed the problem for me. Thanks! I didn't have to add the part in <httpModules> in fact, I tried, but it gave me a syntax error because "name" is a required element and the line you proivded doesn't use that element. But it worked without that line.

I then had an additional problem that I was using <asp:ScriptManager> instead of <asp:ToolkitScriptManager"> Seems to be okay now though.

Thanks,

Eric

_{Friday, April 23, 2010 4:38 PM}

yes I changed to use the ToolkitScriptManager and I still have the same problem. How many files do you have in the

/scripts/System.Web.Extensions\3.5.0.0\3.5.30729.196 ? I only have MicrosoftAjax.debug.js and MicrosoftAjax.js. I also get an error when I execute

tthe page that "Microsoft JScript runtime error: Sys.Webforms.PAgeREquestMAnager' is null or not an object"

Any ideas if I am missing more files? the following is the view source of the page when I break during debug. thank you

</title></head>
<body>
<form name="form1" method="post" action="testservervariable.aspx" id="form1">
<div>
<input type="hidden" name="ScriptManager1_HiddenField" id="ScriptManager1_HiddenField" value="" />
<input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" />
<input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" />
<input type="hidden" name="__LASTFOCUS" id="__LASTFOCUS" value="" />
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwULLTIwNzk1NTk1NzIPZBYCAgMPZBYCAgMPZBYCZg9kFgQCBw8QZA8WAgIBAgIWAhAFBGdyb3cFBGdyb3dnEAUFZ3JvdzIFBWdyb3cyZxYBZmQCCQ8QZGQWAWZkZOZiZIQ34S8+a3is7qt++QYK/9kC" />
</div>

   <input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEWDALulK73AwL2h6L4BALs0bLrBgLs0fbZDAL8ybSHDQLB3u3GDgLUwrDCAwKQs+qdBwLByYWPDQLBn+ljAvuq18cKAtq01VDvEx07/h4Pda4NX9DgMY9cU3ulzw==" />
</div>
    <div>

    </div>

                <script type="text/javascript">
//<![CDATA[
Sys.WebForms.PageRequestManager._initialize('ScriptManager1', document.getElementById('form1'));
Sys.WebForms.PageRequestManager.getInstance()._updateControls(['tUpdatePanel1'], [], [], 90);
//]]>
<

_{Sunday, April 25, 2010 6:32 PM}

forget UpdatePanel etc. Just use the "PokeIn" ..

_{Tuesday, May 4, 2010 4:19 AM}

I found as with others that URL Rewritting is the problem. My solution to the problem is only to rewrite what I need.

This also speeds up the whole load time, since we only rewrite the things that we want. I added this piece....

protected void Application_BeginRequest(object sender, EventArgs e)
        {
            if ((Request.Url.LocalPath.EndsWith("scriptresource.axd", StringComparison.InvariantCultureIgnoreCase) ||
                Request.Url.LocalPath.EndsWith("webresource.axd", StringComparison.InvariantCultureIgnoreCase)) ||
                Request.Url.LocalPath.EndsWith("gif", StringComparison.InvariantCultureIgnoreCase) ||
                Request.Url.LocalPath.EndsWith("jpg", StringComparison.InvariantCultureIgnoreCase) ||
                Request.Url.LocalPath.EndsWith("css", StringComparison.InvariantCultureIgnoreCase) ||
                Request.Url.LocalPath.EndsWith("js", StringComparison.InvariantCultureIgnoreCase))
            {
                return;
            }

_{Friday, June 11, 2010 6:41 AM}

I ran into this.

Cause was in the web.config (maxQueryString):

_{Tuesday, June 7, 2011 7:04 PM}

Ok i did what you said and burnt my machine.

What do i do next?

_{Monday, June 20, 2011 5:39 PM}

Our issue was also URL rewriting, and I solved it with the following handlers from my development PC:

...

      <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
      <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
      <add verb="GET,HEAD" path="ScriptResource.axd" validate="false" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
</httpHandlers>

_{Tuesday, August 23, 2011 1:56 AM}

Simply change you web.config with new one and change the settings all will be right

_{Monday, July 30, 2012 3:49 PM}

Hello,

I am using Asp.net 4.0 and Ajax v4.0. I am using AJAXToolKit for quick search functionality..I am getting ‘Sys’ is undefined or ASP.NET Ajax client-side framework failed to load in a ASP .NET 4.0 website..When i run my appliction on local server then everything work fine but when i access my application from NLB client server then i get this error..I check both application server IIS setting, Machin.config, Web.config..all are identical..even i try to make changes in web.config file like putting handlers, etc.. but no luck. i assume in .net4.0 there no need to change in web.config as it is already taken care by Visual Studio...i gone through many blogs and tried all combination but no luck..:(..even i restall my framework on both application..rebooted many times...pls let me know if you can help me..fast response is appriciated..thanks

_{Monday, July 30, 2012 4:01 PM}

With technoligies in the process of changing it is always tricky to pin point this issue. However, we already know that sys is part of the ajax library.

So, add this to the top of your .js files.

/// <reference path="http://ajax.microsoft.com/ajax/3.5/MicrosoftAjax.js" />

Import it into our app manually and do not depend on the .net development enviroment to do it for you.

_{Monday, July 30, 2012 4:14 PM}

Hi..thanks for reply...I don't have any JS file in my solution excluding default Jquery scripts..but i am not using these files and i am not using any JS function in my code...In my page i am having only one textbox and ajaxToolkit:AutoCompleteExtender in my page..I have downloaded Ajax 4.0 dll from site and added reference in my project..

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit"%>

<asp:ScriptManager ID="ScriptManager2" runat="server" EnablePageMethods="true">

</asp:ScriptManager>

_{Sunday, August 26, 2012 2:00 PM}

I am face same problem when Debuging my project & said that "ASP.NET Ajax client-side framework failed to load"

i use Visual Studio 2012RC

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