Skip to main content
BuyLog In
ASP.NET Web Forms Controls
Search in…
Docs > Troubleshooting > Client-Side Issues > ReferenceError: 'X' is not defined
All docs
V24.2
ASP.NET Web Forms Controls
.NET Support and Migration
Prerequisites
Supported Browsers
What's Installed
Get Started
Upgrade to a New Version
Common Concepts
Components
Security Considerations
Redistribution and Deployment
Troubleshooting
Get Started
Common Issues
Client-Side Issues
The 'X is undefined' error occurs or controls are rendered with incorrect styles
Cannot access DevExpress ASP.NET controls on the client
ReferenceError: 'X' is not defined
Microsoft JScript runtime error: 'X' is undefined
Server-Side Issues
Installation and Update Issues
Performance Issues
Grid-Related Issues
Themes-Related Issues
Get More Help
.NET Framework API Reference
Client API Reference
Download CHM

The 'ReferenceError: 'X' is not defined' error message appears when the Control.Enabled property is set to false

Error Description

The “ReferenceError: X is not defined” error message appears when you try to access a DevExpress ASP.NET control whose Enabled property is set to false.

This error occurs because client scripts are not rendered for a control if its Enabled property is set to false. This means you cannot access the control on the client.

Solution

Use the ClientEnabled property to disable a control on the server and then make it available on the client.

See Also

The Difference Between the Enabled / Visible and ClientEnabled / ClientVisible Properties