Uncaught TypeError: Cannot read property 'wrapper' of undefined

[Miroslav]

Hello. I'm testing MultiColumnComboBox and when loading the page I get "Uncaught TypeError: Cannot read property 'wrapper' of undefined" error. This is with CDN disabled. When I turn CDN on, everything runs OK. Telerik UI is updated to 2020 1 219 version. What am I missing or need to upgrade? I can't have CDN enabled on production server.

The exception happends in Telerik.Web.UI.WebResource.axd in c.RadMultiColumnComboBox._initializeKendoWidget:

K.kendoWidget=a(K._element).kendoMultiColumnComboBox(J).getKendoMultiColumnComboBox(); <-------- here the K.kendoWidget is undefined
var I=$telerik.$("#"+K.get_clientStateFieldID());
if(I){K.kendoWidget.wrapper.append(); <-------- here it crashes

 

[Miroslav]

I updated also kendo.all.min.js and jquery.min.js, but to no avail.

[Peter Milchev]

Hello Miroslav,

Most probably the custom loading of the kendo library is affecting the behavior.

You can try to isolate the page to a simple MultiColumnComboBox declaration and a ScriptManager. Then, you can remove the custom settings and custom scripts one by one and check what is causing the issue. 

Meanwhile, you can check the following articles if they can help:

• https://docs.telerik.com/devtools/aspnet-ajax/controls/htmlchart/how-to/radhtmlchart-integration-with-kendoui-widgets;
• https://docs.telerik.com/devtools/aspnet-ajax/general-information/using-jquery/using-jquery

Regards,
Peter Milchev
Progress Telerik

[Miroslav]

Peter, thanks for help. We found out that setting EnableScriptCombine to False (previously True) makes the application run without problems. So one of the custom scripts is probably the culprit and doesn't like combining.