Javascript Error in IE11 with Decoration of Select Control

2 posts, 0 answers
  1. Jay
    Jay avatar
    89 posts
    Member since:
    Nov 2007

    Posted 07 Nov 2017 Link to this post

    We are seeing a JavaScript error when we select an Option in a Select control with a ASP Postback on IE11 via keyboard input.

    <%@ Page Language="C#" AutoEventWireup="true" Inherits="System.Web.UI.Page" %>
    <script runat="server">
        void Page_Load(object sender, EventArgs e)
            decorator.DecoratedControls = FormDecoratorDecoratedControls.Select;
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
    <title>DD Test Page</title>
    <form id="DialogForm" runat="server">
        <telerik:RadScriptManager runat="server" />
        <telerik:RadAjaxManager runat="server" />
        <telerik:RadFormDecorator ID="decorator" runat="server" DecorationZoneID="Panel1" EnableEmbeddedSkins="false" RenderMode="Lightweight" />
        <telerik:RadAjaxPanel ID="Panel1" runat="server">
            <asp:DropDownList ID="DD1" runat="server" AutoPostBack="true">
                <asp:ListItem Text="[Select]" Value="" />
                <asp:ListItem Text="T1" Value="1" />
                <asp:ListItem Text="T2" Value="2" />
            <asp:Button runat="server" Text="Refresh" />


    Reproduce by clicking the DropDown control, and then pressing 'T', and then clicking on a blank section of the page.

    Do any workarounds exist for avoiding this error?

  2. Rumen
    Rumen avatar
    14098 posts

    Posted 10 Nov 2017 Link to this post

    Hello Jay,

    I was able to reproduce the Unable to get property 'dispatchEvent' of undefined or null reference? error. Unfortunately I wasn't able to find a workaround for it different from removing the AutoPostBack="true" of the dropdown control. 

    I logged it for fixing in our bug tracking system and updated your Telerik points.

    Best regards,
    Progress Telerik
    Try our brand new, jQuery-free Angular components built from ground-up which deliver the business app essential building blocks - a grid component, data visualization (charts) and form elements.
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