Unable to get property '_events' of undefined or null reference

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Kong
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Kong asked on 24 Nov 2021, 08:03 PM

I'm getting this error after upgrading my app to the latest version.  What am I missing?

 

"Unable to get property '_events' of undefined or null reference"

 

"Uncaught TypeError: Cannot read properties of undefined (reading '_events')"

 

Telerik.Web.UI.WebResource.axd 

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Vessy
Telerik team
answered on 25 Nov 2021, 09:26 AM

Hi Kong,

The are is a known issue in the latest version for the Classic render mode of the DatePickers when their keyboard navigation is enabled. The bug is already planned and it will be resolved in our up-coming R1 2022 release.

https://feedback.telerik.com/aspnet-ajax/1543331

Until the issue is fixed, you can chose between one of the following workarounds:

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>

Regards,
Vessy
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Kong
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Vessy
Telerik team
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