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How to solve the jQuery script loading problem ASP.NET WebForms?

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When you use both Syncfusion ASP.NET Classic and ASP.NET (EJWEB) controls in a same page, ASP.NET(EJWEB) control raises a script error-“ej is undefined”.


The error is raised due to jQuery script conflict, since two different versions of jQuery files are referred in the application (one is referred from Syncfusion shared web assembly and another one is used in application level for EJWEB controls).


To avoid conflict between two jQuery scripts, you have to skip loading the jQuery file that is referred from shared web source. You can achieve this by disabling SFjQueryLoad key in Web.Config file. Refer to the following code example.


<asp:ScriptManager ID="scriptmgr" runat="server"></asp:ScriptManager> 
<ej:Button ID="ejButton" Text="Sample" runat="server">
 <syncfusion:ButtonAdv ID="sfButton" Text=" Sample One" runat="server"></syncfusion:ButtonAdv>


<add key="SFjQueryLoad" value="false" />



A new version of Essential Studio for ASP.NET is available. Versions prior to the release of Essential Studio 2014, Volume 2 will now be referred to as a classic version. The new ASP.NET suite is powered by Essential Studio for JavaScript providing client-side rendering of HTML 5-JavaScript controls, offering better performance, and better support for touch interactivity. The new version includes all the features of the old version, so migration is easy.

The Classic controls can be used in existing projects; however, if you are starting a new project, we recommend using the latest version of Essential Studio for ASP.NET. Although Syncfusion will continue to support all Classic Versions, we are happy to assist you in migrating to the newest edition.

For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our other controls. If you have any queries or require clarifications, please let us know in the comments section below.

You can also contact us through our support forumsDirect-Trac, or feedback portal. We are always happy to assist you

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