In Development
Last Updated: 29 Nov 2021 12:48 by ADMIN
Scheduled for R1 2022

Error message:

Uncaught TypeError: Cannot read properties of undefined (reading '_events')
    at Sys.UI.DomEvent.addHandler (Telerik.Web.UI.WebResource.axd:6:57366)
    at Telerik.Web.UI.RadCalendar.initialize (Telerik.Web.UI.WebResource.axd:4916:8)
    at Telerik.Web.UI.RadCalendar.endUpdate (Telerik.Web.UI.WebResource.axd:6:53689)
    at Sys.Component.create (Telerik.Web.UI.WebResource.axd:6:55151)
    at Array.<anonymous> (Default.aspx:130:5)
    at Telerik.Web.UI.WebResource.axd:6:51370
    at Sys._Application._raiseInit (Telerik.Web.UI.WebResource.axd:6:72276)
    at Sys._Application.initialize (Telerik.Web.UI.WebResource.axd:6:69772)
    at b (Telerik.Web.UI.WebResource.axd:6:71512)
    at HTMLDocument.a (Telerik.Web.UI.WebResource.axd:6:71786)

Possible workarounds from Admin: 

1) Use Lightweight render mode instead of Classic: https://docs.telerik.com/devtools/aspnet-ajax/controls/render-modes#setting-render-mode 

2) Disable temporarily the keyboard navigation of the control

3) Use the attached script and load it on the page: 

3.1) Using a RadScriptManager (adjust the file name and path to fit your application)

<telerik:RadScriptManager ID="RadScriptManager1" runat="server">
    <Scripts>
        <telerik:RadScriptReference Path="fix.js" OutputPosition="End" />
    </Scripts>
</telerik:RadScriptManager>

 

3.2) In an inline script tag somewhere AFTER the ScriptManager(e.g. at the end of the <form> or <body> tag)

3.3) As a script reference - place it AFTER the script manager as 3.2) or use the defer="defer" attribute

<script defer="defer" src="fix.js"></script>

 

4) Submit a support ticket if you would prefer a custom Telerik.Web.UI.dll assembly with the issue resolved.