Sys is undefined

Question

I have an ASP Net AJAX control kit project that i am working on   80  of the time there is no problem   The page runs as it should   If you refresh the page it will sometimes show a javascript error  Sys is undefined    It doesn t happen all the time  but it is reproducible   When it happens  the user has to shut down their browser and reopen the page   This leads me to believe that it could be an IIS setting   Another note   I looked at the page source both when I get the error  and when not   When the page throws errors the following code is missing    lt script src   ScriptResource axd d EAvfjPfYejDh0Z2Zq5zTR TXqL0DgVcj h1wz8cst6uXazNiprV1LnAGq3uL8N2vRbpXu46VsAMFGSgpfovx9 cO8tpy2so6Qm 0HXVGg Y1 amp amp t baeb8cc  type  text javascript  gt  lt  script gt   lt script type  text javascript  gt     lt   CDATA  if  typeof Sys       undefined   throw new Error  ASP NET Ajax client-side framework failed to load          gt   lt  script gt

User · Answer

In my case the problem was that I had putted the following code to keep the gridview tableheader after partial postback:

    protected override void OnPreRenderComplete(EventArgs e)
    {
        if (grv.Rows.Count > 0)
        {
            grv.HeaderRow.TableSection = TableRowSection.TableHeader;
        }
    }

Removing this code stopped the issue.

User · Answer

Try setting your ScriptManager to this    lt asp ScriptManager ID  ScriptManager1  runat  server  EnablePartialRendering  true    gt

User · Answer

I had the same problem after updating my AjaxControlToolkit dll to the latest version 4 1 7 725 from 4 1 60623 0   I ve searched and came up to this page  but none of the answers help me  After looking to the sample website of the Ajax Control Toolkit that is in the CodePlex zip file  I have realized that the  lt asp ScriptManager gt  replaced by the new  lt ajaxtoolkit ToolkitScriptManager gt   I did so and there is no Sys Extended is undefined any more

User · Answer

I know this is an old thread but I found a somewhat unique solution   In my case I was getting the error because I am using both Webforms and MVC in the same ASP NET web application   After mapping routes the issue showed up   I fixed it by adding the following code to ignore routes for both  quot  resource  aspx   pathInfo  quot  and  quot  resource  axd   pathInfo  quot      private void RegisterRoutes RouteCollection routes                routes IgnoreRoute  quot  resource  aspx   pathInfo  quot            routes IgnoreRoute  quot  resource  axd   pathInfo  quot             routes MapRoute              quot Default quot                quot  controller   action   id  quot               new   controller    quot Test quot   action    quot Index quot   id   UrlParameter Optional

User · Answer

Just create blank  axd files in your solutions root foder problem will be resolved   2 file  scriptresouce asx  webresource asxd

User · Answer

Was having a similar issue   except that my page was consistently generating the Sys is undefined error    For me the problem stems from the fact that I ve just installed the AJAX 1 0 extension for  NET 2 0 but had already created my web project  in Visual Studio   When tried to create AJAX controls I kept encountering this error  I spotted Slace s and MadMax1138s posts here   And figured it was my web config  I created a new project using the new  AJAX enabled web site  project type   and sure enough the web config has a large number of customizations necessary to use the AJAX controls      I just updated that web config with the web config updates I had already made myself and dropped it into my existing project and everything worked fine

User · Answer

Add  if  typeof Sys       undefined   Sys Application notifyScriptLoaded       Please check  enter link description here

User · Answer

I solved this problem by creating separate asp net ajax solution and copy and paste all ajax configuration from web config to working project   here are  the must configuration you should set in web config       lt configuration gt   lt configSections gt       lt sectionGroup name  system web extensions  type  System Web Configuration SystemWebExtensionsSectionGroup  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  gt           lt sectionGroup name  scripting  type  System Web Configuration ScriptingSectionGroup  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  gt               lt section name  scriptResourceHandler  type  System Web Configuration ScriptingScriptResourceHandlerSection  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  requirePermission  false  allowDefinition  MachineToApplication   gt   lt  sectionGroup gt        lt  sectionGroup gt   lt  configSections gt               lt assemblies gt                lt add assembly  System Web Extensions      Version 1 0 61025 0        Culture neutral  PublicKeyToken 31bf3856ad364e35   gt            lt  assemblies gt              lt  compilation gt           lt httpHandlers gt           lt remove verb     path    asmx   gt           lt add verb     path    asmx  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt           lt add verb     path    AppService axd  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt           lt add verb  GET HEAD  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  validate  false   gt       lt  httpHandlers gt       lt httpModules gt           lt add name  ScriptModule  type  System Web Handlers ScriptModule  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt       lt  httpModules gt   lt  system web gt       lt system webServer gt       lt validation validateIntegratedModeConfiguration  false   gt       lt modules gt           lt add name  ScriptModule  preCondition  integratedMode  type  System Web Handlers ScriptModule  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt       lt  modules gt       lt handlers gt           lt remove name  WebServiceHandlerFactory-Integrated   gt           lt add name  ScriptHandlerFactory  verb     path    asmx  preCondition  integratedMode  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt           lt add name  ScriptHandlerFactoryAppServices  verb     path    AppService axd  preCondition  integratedMode  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt           lt add name  ScriptResource  preCondition  integratedMode  verb  GET HEAD  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt       lt  handlers gt   lt  system webServer gt

User · Answer

Try one of this solutions    1  The browser fails to load the compressed script  This is usually the case if you get the error on IE6  but not on other browsers   The Script Resource Handler     ScriptResource axd compresses the scripts before returning them to the browser  In pre-RTM releases  the handler did it all the time for all browsers  and it wasn   t configurable  There is an issue in one of the components of IE6 that prevents it from loading compressed scripts correctly  See KB article here  In RTM builds  we   ve made two fixes for this  One  we don   t compress if IE6 is the browser client  Two  we   ve now made compression configurable  Here   s how you can toggle the web config   How do you fix it  First  make sure you are using the AJAX Extensions 1 0 RTM release  That alone should be enough  You can also try turning off compression by editing your web config to have the following    lt system web extensions gt   lt scripting gt   lt scriptResourceHandler enableCompression  false  enableCaching  true    gt   lt  scripting gt   lt  system web extensions gt    2  The required configuration for ScriptResourceHandler doesn   t exist for the web config for your application  Make sure your web config contains the entries from the default web config file provided with the extensions install   default location  C  Program Files Microsoft ASP NET ASP NET 2 0 AJAX Extensions v1 0 61025   3  The virtual directory you are using for your web  isn   t correctly marked as an application  thus the configuration isn   t getting loaded  - This would happen for IIS webs   Make sure that you are using a Web Application  and not just a Virtual Directory   4  ScriptResource axd requests return 404  This usually points to a mis-configuration of ASP NET as a whole  On a default installation of ASP NET  any web request to a resource ending in  axd is passed from IIS to ASP NET via an isapi mapping  Additionally the mapping is configured to not check if the file exists  If that mapping does not exist  or the check if file exists isn t disabled  then IIS will attempt to find the physical file ScriptResource axd  won t find it  and return 404   You can check to see if this is the problem by coipy pasting the full url to ScriptResource axd from here  and seeing what it returns   lt script src   MyWebApp ScriptResource axd  snip - long query string   type  text javascript  gt  lt  script gt    How do you fix this  If ASP NET isn t properly installed at all  you can run the  aspnet regiis exe  command line tool to fix it up  It s located in C  WINDOWS Microsoft Net Framework v2 0 50727  You can run  aspnet regiis -i -enable   which does the full registration of ASP NET with IIS and makes sure the ISAPI is enabled in IIS6  You can also run  aspnet regiis -s w3svc 1 root MyWebApp  to only fix up the registration for your web application   5  Resolving the  Sys is undefined  error in ASP NET AJAX RTM under IIS 7  Put this entry under  lt system webServer  gt  lt handlers  gt     lt add name  ScriptResource  preCondition  integratedMode  verb  GET HEAD  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35    gt    and remove the one under  lt system web  gt  lt httpHandlers  gt    References   http   weblogs asp net chrisri demystifying-sys-is-undefined http   geekswithblogs net lorint archive 2007 03 28 110161 aspx

User · Answer

I had the same problem after updating my AjaxControlToolkit dll to the latest version 4 1 7 725 from 4 1 60623 0   I ve searched and came up to this page  but none of the answers help me  After looking to the sample website of the Ajax Control Toolkit that is in the CodePlex zip file  I have realized that the  lt asp ScriptManager gt  replaced by the new  lt ajaxtoolkit ToolkitScriptManager gt   I did so and there is no Sys Extended is undefined any more

User · Answer

I had similar problems and to my surprise what I found that one of my developer had saved web config in the same folder solution as web123 config and by mistake both of these files were uploaded   As soon as I deleted the web123 config file  this error disappeared and ajax framework was loading correctly  even though I have    lt compilation debug  true  gt    In my case I also have following segment  My project is using framework 3 5       lt httpHandlers gt     lt remove verb     path    asmx   gt     lt add verb     path    asmx  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt     lt add verb     path    AppService axd  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt     lt add verb  GET HEAD  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  validate  false   gt   lt  httpHandlers gt   lt httpModules gt     lt add name  ScriptModule  type  System Web Handlers ScriptModule  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt   lt  httpModules gt   lt  system web gt

User · Answer

Hi thanx a lot it solved my issue    By default vs 2008 will add     lt  -- lt add verb     path    asmx  validate  false  type  Microsoft Web Script Services ScriptHandlerFactory  Microsoft Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35    gt         lt add verb  GET  path  ScriptResource axd  type  Microsoft Web Handlers ScriptResourceHandler  validate  false    gt -- gt    Need to correct Default config Above  to below code FIX    lt add verb     path    asmx  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 3 5 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt     lt add verb  GET  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  validate  false   gt

User · Answer

When I experienced the errors    Sys is undefined ASP NET Ajax client-side framework failed to load   in IE when using ASP NET Ajax controls in  NET 2 0  I needed to add the following to the web config file within the  lt system web gt  tags    lt httpHandlers gt     lt remove verb     path    asmx   gt     lt add verb     path    asmx  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 3 5 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt     lt add verb  GET  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  validate  false   gt   lt  httpHandlers gt

User · Answer

Try setting your ScriptManager to this    lt asp ScriptManager ID  ScriptManager1  runat  server  EnablePartialRendering  true    gt

User · Answer

Even after adding the correct entry for web config still getting this error    most common reason for this error is JavaScript that references the Sys namespace too early  Then most obvious fix would be   move the java script block below the ScriptManager control

User · Answer

I know this is an old thread but I found a somewhat unique solution   In my case I was getting the error because I am using both Webforms and MVC in the same ASP NET web application   After mapping routes the issue showed up   I fixed it by adding the following code to ignore routes for both  quot  resource  aspx   pathInfo  quot  and  quot  resource  axd   pathInfo  quot      private void RegisterRoutes RouteCollection routes                routes IgnoreRoute  quot  resource  aspx   pathInfo  quot            routes IgnoreRoute  quot  resource  axd   pathInfo  quot             routes MapRoute              quot Default quot                quot  controller   action   id  quot               new   controller    quot Test quot   action    quot Index quot   id   UrlParameter Optional

User · Answer

Make sure that any client scripts you have that interact with  NET AJAX have the following line at the end   if  typeof Sys       undefined    Sys Application notifyScriptLoaded      This tells the script manager that the whole script file has loaded and that it can begin to call client methods

User · Answer

Development Environment   Dev-Env  VS 2012 FX  4 0 4 5 Implementations  Master ScriptManager   UpdatePanel Timer    Content  UpdatePanel  Patterns  PageRouting   Disclaimer  If all the web config solutions do not work for you and you have implemented PageRouting  IIS 7    then the code snippet below will solve your problems  Background  Dont mean to Highjack this question but had the same problem as everyone else and implemented 100  of the suggestions here  with minor modifications for  Net 4 0 4 5  and none of them worked for me  In my situation i had implemented Page Routing which was ghosting my problem   Basically it would work for about 20  or so  debug runs and then BAM would error out with the Sys is undefined error  After reviewing a couple other posts  that got to talking about the Clean-URL logic  i remembered that i had done PageRouting setup s  Here is the resource i used to build my patterns  Page Routing My one-liner code fixed my VS2012 Debugging problem  rts Ignore  quot  resource  axd   pathInfo  quot       Ignores any Resource cache references  used heavily in AJAX interactions

User · Answer

Make sure that any client scripts you have that interact with  NET AJAX have the following line at the end   if  typeof Sys       undefined    Sys Application notifyScriptLoaded      This tells the script manager that the whole script file has loaded and that it can begin to call client methods

User · Answer

In addition to ensuring you have the ScriptManager on your page you need to ensure that your web config is appropriately configured   When ASP NET AJAX 1 0 was released  for  NET 2 0  there was a lot of custom web config settings which added handlers  controls  etc   You ll find the config info here  http   www asp net AJAX documentation live ConfiguringASPNETAJAX aspx

User · Answer

This is going to sound stupid but I had a similar problem with a site being developed in VS2010 and hosted in the VS Dev Server  The page in question had a scriptmanager to create the connection to a wcf service  I added an extra method to the service and this error started appearing    What fixed it for me was changing from  Auto-assign Port  to  Specific port  with a different port number in the oroject Web settings   I wish I knew why

User · Answer

Try setting your ScriptManager to this    lt asp ScriptManager ID  ScriptManager1  runat  server  EnablePartialRendering  true    gt

User · Answer

In addition to ensuring you have the ScriptManager on your page you need to ensure that your web config is appropriately configured   When ASP NET AJAX 1 0 was released  for  NET 2 0  there was a lot of custom web config settings which added handlers  controls  etc   You ll find the config info here  http   www asp net AJAX documentation live ConfiguringASPNETAJAX aspx

User · Answer

In my case the problem was that I had putted the following code to keep the gridview tableheader after partial postback:

    protected override void OnPreRenderComplete(EventArgs e)
    {
        if (grv.Rows.Count > 0)
        {
            grv.HeaderRow.TableSection = TableRowSection.TableHeader;
        }
    }

Removing this code stopped the issue.

User · Answer

Was having a similar issue   except that my page was consistently generating the Sys is undefined error    For me the problem stems from the fact that I ve just installed the AJAX 1 0 extension for  NET 2 0 but had already created my web project  in Visual Studio   When tried to create AJAX controls I kept encountering this error  I spotted Slace s and MadMax1138s posts here   And figured it was my web config  I created a new project using the new  AJAX enabled web site  project type   and sure enough the web config has a large number of customizations necessary to use the AJAX controls      I just updated that web config with the web config updates I had already made myself and dropped it into my existing project and everything worked fine

User · Answer

In addition to ensuring you have the ScriptManager on your page you need to ensure that your web config is appropriately configured   When ASP NET AJAX 1 0 was released  for  NET 2 0  there was a lot of custom web config settings which added handlers  controls  etc   You ll find the config info here  http   www asp net AJAX documentation live ConfiguringASPNETAJAX aspx

User · Answer

Make sure you don t have any Rewrite rules that change your url   In my case the application thought it was only level deeper then the url reached   Example  http   mysite com app page aspx was the real url  But i cut off  app  this worked fine for ASP net and WCF  but clearly not for Ajax

User · Answer

I found the error when using a combination of the Ajax Control Toolkit ToolkitScriptManager and URL Write 2 0   In my  lt rewrite gt   lt outboundRules gt  I had a precondition    lt preConditions gt       lt preCondition name  IsHTML  gt           lt add input   RESPONSE CONTENT TYPE   pattern   text html   gt       lt  preCondition gt   lt  preConditions gt    But apparently some of my outbound rules weren t set to use the precondition    Once I had that preCondition set on all my outbound rules    lt rule preCondition  IsHTML  name  MyOutboundRule  gt    No more problem

User · Answer

Development Environment   Dev-Env  VS 2012 FX  4 0 4 5 Implementations  Master ScriptManager   UpdatePanel Timer    Content  UpdatePanel  Patterns  PageRouting   Disclaimer  If all the web config solutions do not work for you and you have implemented PageRouting  IIS 7    then the code snippet below will solve your problems  Background  Dont mean to Highjack this question but had the same problem as everyone else and implemented 100  of the suggestions here  with minor modifications for  Net 4 0 4 5  and none of them worked for me  In my situation i had implemented Page Routing which was ghosting my problem   Basically it would work for about 20  or so  debug runs and then BAM would error out with the Sys is undefined error  After reviewing a couple other posts  that got to talking about the Clean-URL logic  i remembered that i had done PageRouting setup s  Here is the resource i used to build my patterns  Page Routing My one-liner code fixed my VS2012 Debugging problem  rts Ignore  quot  resource  axd   pathInfo  quot       Ignores any Resource cache references  used heavily in AJAX interactions

User · Answer

I hate adding to such a huge topic and so much later  but I ve think I have a solution that work in VS2015 at the very least   I was on a hunt to find a reason for the sys error  and the only solution that worked for me was to add EnableCdn  true  in a ScriptManager like this    lt asp ScriptManager ID  ScriptManager1  runat  server  EnableCdn  true    gt    See the MSDN for more information   Why do we need to do this   When working on a asp net web application  you have to enable CDN so that Microsoft can download the Sys  library   There was probably a script in your page that was using the Sys function  Setting EnableCdn  true  would ensure that the Sys library is downloaded before it is used   What s CDN   A quote from https   www sitepoint com 7-reasons-to-use-a-cdn      Most CDNs are used to host static resources such as images  videos    audio clips  CSS files and JavaScript  You   ll find common JavaScript   libraries  HTML5 shims  CSS resets  fonts and other assets available   on a variety of public and private CDN systems    Both Google and Microsoft have CDNs  All you have to do is add a reference  Usually CDNs are added via a script resource    lt script src  https   ajax aspnetcdn com ajax 4 5 1 1 MicrosoftAjax js  type  text javascript  gt  lt  script gt    Once you set EnableCdn  true  and Microsoft will add it s little CDN reference  like the one above  in the page which downloads the Sys library   I hope that helps anybody that ran into the same issue

User · Answer

Try setting your ScriptManager to this    lt asp ScriptManager ID  ScriptManager1  runat  server  EnablePartialRendering  true    gt

User · Answer

Make sure that any client scripts you have that interact with  NET AJAX have the following line at the end   if  typeof Sys       undefined    Sys Application notifyScriptLoaded      This tells the script manager that the whole script file has loaded and that it can begin to call client methods

User · Answer

You must add these lines in the web config                                                                                            lt httpHandlers gt     lt remove verb     path    asmx   gt     lt add verb     path    asmx  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt     lt add verb     path    AppService axd  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt     lt add verb  GET HEAD  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  validate  false   gt   lt  httpHandlers gt   lt httpModules gt     lt add name  ScriptModule  type  System Web Handlers ScriptModule  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt   lt  httpModules gt   lt  system web gt                                                                                                   Hope this helps

User · Answer

Make sure that any client scripts you have that interact with  NET AJAX have the following line at the end   if  typeof Sys       undefined    Sys Application notifyScriptLoaded      This tells the script manager that the whole script file has loaded and that it can begin to call client methods

User · Answer

I fixed my problem by moving the  lt script type  text javascript  gt  lt  script gt  block containing the Sys   calls lower down  to the last item before the close of the body s  lt asp Content  gt  section  in the HTML on the page  I originally had my the script block in the HEAD  lt asp Content  gt  section of my page  I was working inside a page that had a MasterPageFile  Hope this helps someone out

User · Answer

I was having this same issue and after much wrangling I decided to try and isolate the problem and simply load the script manager in an empty page which still resulted in this same error   Having isolated the problem I discovered through a comparison of my site s web config with a brand new  working  test site that changing  lt compilation debug  true  gt  to  lt compilation debug  false  gt  in the system web section of my web config fixes the problem     I also had to remove the  lt xhtmlConformance mode  Legacy   gt  entry from system web to make the update panel work properly   Click here for a description of this issue

User · Answer

In my case  I ve found a very hidden reason     There was this page route with in Global ascx cs which doesn t appear in my tests in sub-folders but returns the question error all the time    another day with strange issues   routes MapPageRoute  siteDefault     culture        default aspx   false  new RouteValueDictionary new   culture       w 2      w 2 -  w 2

User · Answer

I fixed my problem by moving the  lt script type  text javascript  gt  lt  script gt  block containing the Sys   calls lower down  to the last item before the close of the body s  lt asp Content  gt  section  in the HTML on the page  I originally had my the script block in the HEAD  lt asp Content  gt  section of my page  I was working inside a page that had a MasterPageFile  Hope this helps someone out

User · Answer

Just create blank  axd files in your solutions root foder problem will be resolved   2 file  scriptresouce asx  webresource asxd

User · Answer

In case none of the above works for you  and you happen to be overriding OnPreRenderComplete  make sure you call base OnPreRenderComplete  My therapist is going to be happy to see me back

User · Answer

Dean L s answer  https   stackoverflow com a 1718513 292060 worked for me  since my call to Sys was also too early  Since I m using jQuery  instead of moving it down  I put the script inside a document ready call     document  ready function        Sys  calls here       This seems to be late enough that Sys is available

User · Answer

I hate adding to such a huge topic and so much later  but I ve think I have a solution that work in VS2015 at the very least   I was on a hunt to find a reason for the sys error  and the only solution that worked for me was to add EnableCdn  true  in a ScriptManager like this    lt asp ScriptManager ID  ScriptManager1  runat  server  EnableCdn  true    gt    See the MSDN for more information   Why do we need to do this   When working on a asp net web application  you have to enable CDN so that Microsoft can download the Sys  library   There was probably a script in your page that was using the Sys function  Setting EnableCdn  true  would ensure that the Sys library is downloaded before it is used   What s CDN   A quote from https   www sitepoint com 7-reasons-to-use-a-cdn      Most CDNs are used to host static resources such as images  videos    audio clips  CSS files and JavaScript  You   ll find common JavaScript   libraries  HTML5 shims  CSS resets  fonts and other assets available   on a variety of public and private CDN systems    Both Google and Microsoft have CDNs  All you have to do is add a reference  Usually CDNs are added via a script resource    lt script src  https   ajax aspnetcdn com ajax 4 5 1 1 MicrosoftAjax js  type  text javascript  gt  lt  script gt    Once you set EnableCdn  true  and Microsoft will add it s little CDN reference  like the one above  in the page which downloads the Sys library   I hope that helps anybody that ran into the same issue

User · Answer

I was using telerik and had exactly same problem   adding this to web config resolved my issue      lt location path  Telerik Web UI WebResource axd  gt         lt system web gt          lt authorization gt            lt allow users      gt          lt  authorization gt        lt  system web gt     lt  location gt    maybe it will help you too  it was Authentication problem   Source

User · Answer

I solved this problem by creating separate asp net ajax solution and copy and paste all ajax configuration from web config to working project   here are  the must configuration you should set in web config       lt configuration gt   lt configSections gt       lt sectionGroup name  system web extensions  type  System Web Configuration SystemWebExtensionsSectionGroup  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  gt           lt sectionGroup name  scripting  type  System Web Configuration ScriptingSectionGroup  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  gt               lt section name  scriptResourceHandler  type  System Web Configuration ScriptingScriptResourceHandlerSection  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  requirePermission  false  allowDefinition  MachineToApplication   gt   lt  sectionGroup gt        lt  sectionGroup gt   lt  configSections gt               lt assemblies gt                lt add assembly  System Web Extensions      Version 1 0 61025 0        Culture neutral  PublicKeyToken 31bf3856ad364e35   gt            lt  assemblies gt              lt  compilation gt           lt httpHandlers gt           lt remove verb     path    asmx   gt           lt add verb     path    asmx  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt           lt add verb     path    AppService axd  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt           lt add verb  GET HEAD  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  validate  false   gt       lt  httpHandlers gt       lt httpModules gt           lt add name  ScriptModule  type  System Web Handlers ScriptModule  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt       lt  httpModules gt   lt  system web gt       lt system webServer gt       lt validation validateIntegratedModeConfiguration  false   gt       lt modules gt           lt add name  ScriptModule  preCondition  integratedMode  type  System Web Handlers ScriptModule  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt       lt  modules gt       lt handlers gt           lt remove name  WebServiceHandlerFactory-Integrated   gt           lt add name  ScriptHandlerFactory  verb     path    asmx  preCondition  integratedMode  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt           lt add name  ScriptHandlerFactoryAppServices  verb     path    AppService axd  preCondition  integratedMode  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt           lt add name  ScriptResource  preCondition  integratedMode  verb  GET HEAD  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt       lt  handlers gt   lt  system webServer gt

User · Answer

In addition to ensuring you have the ScriptManager on your page you need to ensure that your web config is appropriately configured   When ASP NET AJAX 1 0 was released  for  NET 2 0  there was a lot of custom web config settings which added handlers  controls  etc   You ll find the config info here  http   www asp net AJAX documentation live ConfiguringASPNETAJAX aspx

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I had similar problems and to my surprise what I found that one of my developer had saved web config in the same folder solution as web123 config and by mistake both of these files were uploaded   As soon as I deleted the web123 config file  this error disappeared and ajax framework was loading correctly  even though I have    lt compilation debug  true  gt    In my case I also have following segment  My project is using framework 3 5       lt httpHandlers gt     lt remove verb     path    asmx   gt     lt add verb     path    asmx  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt     lt add verb     path    AppService axd  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt     lt add verb  GET HEAD  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  validate  false   gt   lt  httpHandlers gt   lt httpModules gt     lt add name  ScriptModule  type  System Web Handlers ScriptModule  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt   lt  httpModules gt   lt  system web gt

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Please please please do check that the Server has the correct time and date set     After about wasting 6 hours  i read it somewhere     The date and time for the server must be updated to work correctly     otherwise you will get  Sys  is undefined error

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Make sure you don t have any Rewrite rules that change your url   In my case the application thought it was only level deeper then the url reached   Example  http   mysite com app page aspx was the real url  But i cut off  app  this worked fine for ASP net and WCF  but clearly not for Ajax

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You must add these lines in the web config                                                                                            lt httpHandlers gt     lt remove verb     path    asmx   gt     lt add verb     path    asmx  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt     lt add verb     path    AppService axd  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt     lt add verb  GET HEAD  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  validate  false   gt   lt  httpHandlers gt   lt httpModules gt     lt add name  ScriptModule  type  System Web Handlers ScriptModule  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt   lt  httpModules gt   lt  system web gt                                                                                                   Hope this helps

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I don t think this point has been added and since I just spent some time hunting this down I hope it can help  I am working with IIS 7 and using the ASP NET v4 Framework  In my case it was important that an entry be added to both the  and  section of the  entry in the web config file  My web config file has a lot of handlers and in my case it was easiest to add the ScriptResources entry to the top of the handlers section   Most importantly  it needs to be placed before any entry that will act as a wildcard and capture the request   Adding it after a wildcard entry will cause it to be ignored and the error will still appear The module can be added to the top or bottom of the section  Web config Sample    lt system webServer gt       lt handlers gt         lt clear   gt         lt add name  ScriptResource  preCondition  integratedMode  verb  GET HEAD  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35    gt         lt  -- Make sure wildcard rules are below the ScriptResource tag -- gt       lt  handlers gt       lt modules gt         lt add name  ScriptModule  type  System Web Handlers ScriptModule  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt         lt  -- Other modules are added here -- gt       lt  modules gt     lt  system webServer gt

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I have been seeing the exact same error today  but it was not a config or direct JavaScript issue   An external  net project had been updated but the changes not picked up properly in the compilation of the web site  My presumption is that ASP NET ajax was not able to construct the client representations of the  NET objects properly and so was failing to load correctly   To resolve  I rebuilt the external project s   and rebuilt my solution that was experiencing issues  The problem went away

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I had same probleme but i fixed it by    When putting a script file into a page  make sure it is    lt script gt  lt  script gt  and not  lt script   gt     I have followed this  http   forums asp net t 1742435 aspx An element with id form1 could not be found Script error on page load  Hope this will help

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Hi thanx a lot it solved my issue    By default vs 2008 will add     lt  -- lt add verb     path    asmx  validate  false  type  Microsoft Web Script Services ScriptHandlerFactory  Microsoft Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35    gt         lt add verb  GET  path  ScriptResource axd  type  Microsoft Web Handlers ScriptResourceHandler  validate  false    gt -- gt    Need to correct Default config Above  to below code FIX    lt add verb     path    asmx  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 3 5 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt     lt add verb  GET  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  validate  false   gt

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Even after adding the correct entry for web config still getting this error    most common reason for this error is JavaScript that references the Sys namespace too early  Then most obvious fix would be   move the java script block below the ScriptManager control

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When I experienced the errors    Sys is undefined ASP NET Ajax client-side framework failed to load   in IE when using ASP NET Ajax controls in  NET 2 0  I needed to add the following to the web config file within the  lt system web gt  tags    lt httpHandlers gt     lt remove verb     path    asmx   gt     lt add verb     path    asmx  validate  false  type  System Web Script Services ScriptHandlerFactory  System Web Extensions  Version 3 5 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt     lt add verb  GET  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  validate  false   gt   lt  httpHandlers gt

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I was using telerik and had exactly same problem   adding this to web config resolved my issue      lt location path  Telerik Web UI WebResource axd  gt         lt system web gt          lt authorization gt            lt allow users      gt          lt  authorization gt        lt  system web gt     lt  location gt    maybe it will help you too  it was Authentication problem   Source

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I don t think this point has been added and since I just spent some time hunting this down I hope it can help  I am working with IIS 7 and using the ASP NET v4 Framework  In my case it was important that an entry be added to both the  and  section of the  entry in the web config file  My web config file has a lot of handlers and in my case it was easiest to add the ScriptResources entry to the top of the handlers section   Most importantly  it needs to be placed before any entry that will act as a wildcard and capture the request   Adding it after a wildcard entry will cause it to be ignored and the error will still appear The module can be added to the top or bottom of the section  Web config Sample    lt system webServer gt       lt handlers gt         lt clear   gt         lt add name  ScriptResource  preCondition  integratedMode  verb  GET HEAD  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35    gt         lt  -- Make sure wildcard rules are below the ScriptResource tag -- gt       lt  handlers gt       lt modules gt         lt add name  ScriptModule  type  System Web Handlers ScriptModule  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35   gt         lt  -- Other modules are added here -- gt       lt  modules gt     lt  system webServer gt

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Try one of this solutions    1  The browser fails to load the compressed script  This is usually the case if you get the error on IE6  but not on other browsers   The Script Resource Handler     ScriptResource axd compresses the scripts before returning them to the browser  In pre-RTM releases  the handler did it all the time for all browsers  and it wasn   t configurable  There is an issue in one of the components of IE6 that prevents it from loading compressed scripts correctly  See KB article here  In RTM builds  we   ve made two fixes for this  One  we don   t compress if IE6 is the browser client  Two  we   ve now made compression configurable  Here   s how you can toggle the web config   How do you fix it  First  make sure you are using the AJAX Extensions 1 0 RTM release  That alone should be enough  You can also try turning off compression by editing your web config to have the following    lt system web extensions gt   lt scripting gt   lt scriptResourceHandler enableCompression  false  enableCaching  true    gt   lt  scripting gt   lt  system web extensions gt    2  The required configuration for ScriptResourceHandler doesn   t exist for the web config for your application  Make sure your web config contains the entries from the default web config file provided with the extensions install   default location  C  Program Files Microsoft ASP NET ASP NET 2 0 AJAX Extensions v1 0 61025   3  The virtual directory you are using for your web  isn   t correctly marked as an application  thus the configuration isn   t getting loaded  - This would happen for IIS webs   Make sure that you are using a Web Application  and not just a Virtual Directory   4  ScriptResource axd requests return 404  This usually points to a mis-configuration of ASP NET as a whole  On a default installation of ASP NET  any web request to a resource ending in  axd is passed from IIS to ASP NET via an isapi mapping  Additionally the mapping is configured to not check if the file exists  If that mapping does not exist  or the check if file exists isn t disabled  then IIS will attempt to find the physical file ScriptResource axd  won t find it  and return 404   You can check to see if this is the problem by coipy pasting the full url to ScriptResource axd from here  and seeing what it returns   lt script src   MyWebApp ScriptResource axd  snip - long query string   type  text javascript  gt  lt  script gt    How do you fix this  If ASP NET isn t properly installed at all  you can run the  aspnet regiis exe  command line tool to fix it up  It s located in C  WINDOWS Microsoft Net Framework v2 0 50727  You can run  aspnet regiis -i -enable   which does the full registration of ASP NET with IIS and makes sure the ISAPI is enabled in IIS6  You can also run  aspnet regiis -s w3svc 1 root MyWebApp  to only fix up the registration for your web application   5  Resolving the  Sys is undefined  error in ASP NET AJAX RTM under IIS 7  Put this entry under  lt system webServer  gt  lt handlers  gt     lt add name  ScriptResource  preCondition  integratedMode  verb  GET HEAD  path  ScriptResource axd  type  System Web Handlers ScriptResourceHandler  System Web Extensions  Version 1 0 61025 0  Culture neutral  PublicKeyToken 31bf3856ad364e35    gt    and remove the one under  lt system web  gt  lt httpHandlers  gt    References   http   weblogs asp net chrisri demystifying-sys-is-undefined http   geekswithblogs net lorint archive 2007 03 28 110161 aspx

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Dean L s answer  https   stackoverflow com a 1718513 292060 worked for me  since my call to Sys was also too early  Since I m using jQuery  instead of moving it down  I put the script inside a document ready call     document  ready function        Sys  calls here       This seems to be late enough that Sys is available

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Add  if  typeof Sys       undefined   Sys Application notifyScriptLoaded       Please check  enter link description here

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Please please please do check that the Server has the correct time and date set     After about wasting 6 hours  i read it somewhere     The date and time for the server must be updated to work correctly     otherwise you will get  Sys  is undefined error

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I had same probleme but i fixed it by    When putting a script file into a page  make sure it is    lt script gt  lt  script gt  and not  lt script   gt     I have followed this  http   forums asp net t 1742435 aspx An element with id form1 could not be found Script error on page load  Hope this will help

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I found the error when using a combination of the Ajax Control Toolkit ToolkitScriptManager and URL Write 2 0   In my  lt rewrite gt   lt outboundRules gt  I had a precondition    lt preConditions gt       lt preCondition name  IsHTML  gt           lt add input   RESPONSE CONTENT TYPE   pattern   text html   gt       lt  preCondition gt   lt  preConditions gt    But apparently some of my outbound rules weren t set to use the precondition    Once I had that preCondition set on all my outbound rules    lt rule preCondition  IsHTML  name  MyOutboundRule  gt    No more problem

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In case none of the above works for you  and you happen to be overriding OnPreRenderComplete  make sure you call base OnPreRenderComplete  My therapist is going to be happy to see me back

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I have been seeing the exact same error today  but it was not a config or direct JavaScript issue   An external  net project had been updated but the changes not picked up properly in the compilation of the web site  My presumption is that ASP NET ajax was not able to construct the client representations of the  NET objects properly and so was failing to load correctly   To resolve  I rebuilt the external project s   and rebuilt my solution that was experiencing issues  The problem went away

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I was having this same issue and after much wrangling I decided to try and isolate the problem and simply load the script manager in an empty page which still resulted in this same error   Having isolated the problem I discovered through a comparison of my site s web config with a brand new  working  test site that changing  lt compilation debug  true  gt  to  lt compilation debug  false  gt  in the system web section of my web config fixes the problem     I also had to remove the  lt xhtmlConformance mode  Legacy   gt  entry from system web to make the update panel work properly   Click here for a description of this issue

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In my case  I ve found a very hidden reason     There was this page route with in Global ascx cs which doesn t appear in my tests in sub-folders but returns the question error all the time    another day with strange issues   routes MapPageRoute  siteDefault     culture        default aspx   false  new RouteValueDictionary new   culture       w 2      w 2 -  w 2

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This is going to sound stupid but I had a similar problem with a site being developed in VS2010 and hosted in the VS Dev Server  The page in question had a scriptmanager to create the connection to a wcf service  I added an extra method to the service and this error started appearing    What fixed it for me was changing from  Auto-assign Port  to  Specific port  with a different port number in the oroject Web settings   I wish I knew why

[asp.net] Sys is undefined

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