Content Security Policy

If the strict Content-Security-Policy (CSP) mode is enabled, some browser features are disabled by default:

• Inline JavaScript, such as or DOM event attributes like onclick, is blocked. All script code must reside in separate files, served from a whitelisted domain.
• Dynamic code evaluation via eval() and string arguments for both setTimeout and setInterval are blocked.

Kendo UI uses eval() calls. This is how the Kendo UI templates work internally. Therefore, Kendo UI does not currently support the strict CSP mode.

If CSP mode is enabled for a Kendo UI application, the unsafe-eval keyword should be added as part of the meta tag used for enabling the CSP mode:

<meta http-equiv="Content-Security-Policy" content="script-src 'unsafe-eval' 'self' https://kendo.cdn.telerik.com;">

See Also

Other articles on troubleshooting:

• Common Issues in Kendo UI
• JavaScript Errors
• Performance Issues
• Common Issues in Kendo UI Excel Export
• Common Issues in Kendo UI Charts
• Performance Issues in Kendo UI Widgets for Data Visualization
• Common Issues in Kendo UI ComboBox
• Common Issues in Kendo UI Diagram
• Common Issues in Kendo UI DropDownList
• Common Issues in Kendo UI Editor
• Common Issues in Kendo UI MultiSelect
• Common Issues in Kendo UI Scheduler
• Common Issues in Kendo UI Upload
• Common Issues Related to Styling, Appearance, and Rendering
• Common Issues in Telerik UI for ASP.NET MVC
• Validation Issues in Telerik UI for ASP.NET MVC
• Scaffolding Issues in Telerik UI for ASP.NET MVC
• Common Issues in the Grid ASP.NET MVC HtmlHelper Extension
• Excel Export with the Grid ASP.NET MVC HtmlHelper Extension
• Common Issues in the Spreadsheet ASP.NET MVC HtmlHelper Extension
• Common Issues in the Upload ASP.NET MVC HtmlHelper Extension