Uncaught ReferenceError: $telerik is not defined

[Jimi]

Hi,

 

I got the Uncaught ReferenceError: $telerik is not defined error. I saw many threads, but didn't find it fit my problem.

Details:

• So far, the issue is not always reproduce. But when it does, it's only reproduce on Windows Server 2016 only, which runs IIS 10
• It's look like the file that declares on window.$telerik is loaded after the file that assign the jQuery into Telerik $telerik.$ = jQuery.noConflict(true); (please see attached print screens)
• There's couple of Telerik controls in the page, such RadUpload and RadButton
  
  

Pleas assist,

 

Shimiz

 

[Jimi]

Any help...?

[Mohammad]

Hi Jimi,

i have the same issue, do you got the fix ??

any help ?

 

 

 

[Rumen]

Hello,

Please check the following resources on the matter:

• Error message "'Telerik' is undefined" when running a website on IIS 7+ Integrated mode 
• Uncaught ReferenceError: Telerik is not defined.

Best regards,

Rumen
Progress Telerik

[Rumen]

Hi again,

A customer who experienced this issue reported that the following web.config section causes the error in his app:

<httpRuntime requestLengthDiskThreshold="512" useFullyQualifiedRedirectUrl="true" executionTimeout="110" requestValidationMode="2.0" targetFramework="4.5" maxRequestLength="102400" />

The targetFramework="4.5 attribute was causing the issue. Once removed - everything started to work as expected.

 

Regards,
Rumen
Progress Telerik

[EZECHIAS]

Removing the target framework from httpRuntime section of your web config will fix that issue

[Rumen]

Hi Ezechias,

Thank you for confirming the solution! Glad that it works for you!

 

Regards,
Rumen
Progress Telerik

[Markus]

 

Hi Rumen, 

 

I can not remove httpRuntime targetFramework in my web application. Could you please make sure your software works if a current targetFramework is set? 

 

Thanks, 

 

Markus 

[Markus]

I found out that a standard asp.net RegularExpressionValidator caused this error. If you set targetFramework to a current version UnobtrusiveValidationMode gets enabled. This causes the conflict. Temporary workaround: Set UnobtrusiveValidationMode to none in App Settings of your web.config file:

<add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />

More Information: https://stackoverflow.com/questions/12452109/asp-net-2012-unobtrusive-validation-with-jquery 

[Rumen]

Hi Markus,

Indeed, this is the recommended way to remedy the issue.

The problem is explained in the Telerik AJAX documentation. Please refer to jQuery Troubleshooting, e.g.

You can avoid jQuery and validation problems with a single line in the web.config that will disable the Unobtrusive Validation.

**web.config**

    <appSettings>
        <add key="ValidationSettings:UnobtrusiveValidationMode" value="None"/>

Best Regards,
Rumen
Progress Telerik

[Rumen]

You can also find more information and scenarios for the error at https://docs.telerik.com/devtools/aspnet-ajax/knowledge-base/common-error-telerik-is-undefined.