Dropdownlist is flickering During Asynchronous Postback

I have placed dropdownlist along with some other controls in an Update panel.During Async Postback, the dropdownlist is flickering. Can any one help me to avoid the flickering of Dropdownlist

Anything in the update panel may flicker. If you don't want something to, you may want to take it out of the update panel. You can use it as a trigger if you are changing something based of the selected index when it changes.

I have noticed this as well. I tried to figure it out for a day or so and I'm taking a break from it. Hopefully someone will answer.

I don't see this behaviour with text boxes though...

It could also be more noticeable if you have a large number of items in the dropdown and more noticeable if they are bound to it. As I said in my previous reply, you can remove it from the update panel if you do not need to change the dropdown's contents by placing it outside the update panel.

DropDownExtender problem

Hi all...

I have problem with DropDownExtender.

There is on the page have placed DropDownExtender and disabled TextBox Control with some text.

When I make right click on the text in disabled textbox, I get JavaScript error like "Object doesn't support this property or method". (Problem with getClientRects function in Script sources file)

Simple content page:

<%@dotnet.itags.org. Page Language="C#" MasterPageFile="~/Site1.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="TestApp.Default" Title="Untitled Page" %><%@dotnet.itags.org. Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %><asp:Content ID="Content1" ContentPlaceHolderID="cphContent" runat="server"><table cellpadding="0" cellspacing="0" border="0"> <tr> <td align="left"> <asp:Label ID="lblLinkName" runat="server" Font-Size="12px" Text="Show Links" Style="display: block; padding: 2px; padding-right: 20px; color: White;font-size:12px;font-weight:700;font-family: Verdana,Arial, MS Sans Serif, Tahoma;" /> <asp:Panel ID="DropPanel" runat="server" Style="display: none; visibility: hidden; background: White;"> <table cellpadding="2" cellspacing="0" border="0" style="width:150px; border: solid 1px Gray;"> <tr> <td><asp:LinkButton ID="lnkFirst" runat="server" Text="First Link" /></td> </tr> <tr> <td><asp:LinkButton ID="lnkSecond" runat="server" Text="Second Link" /></td> </tr> <tr> <td><asp:LinkButton ID="LinkThird" runat="server" Text="Third Link" /></td> </tr> </table> </asp:Panel> <ajaxToolkit:DropDownExtender runat="server" ID="DDE" TargetControlID="lblLinkName" DropDownControlID="DropPanel" HighlightBackColor="#256294" HighlightBorderColor="white" /> </td> </tr> <tr> <td> </td> </tr> <tr> <td><asp:TextBox ID="txtField" runat="server" Width="200" /></td> </tr></table></asp:Content>

 CodeBehind:

 
using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;namespace TestApp{public partialclass Default : System.Web.UI.Page {protected void Page_Load(object sender, EventArgs e) {if (!Page.IsPostBack) { txtField.Text ="Hello World!"; txtField.Enabled =false; } } }}
 

Try to reproduse this bug or leave your email and I send example.

Please help.