For the sake of completeness, here is the reply I got from the ASP.NET support folks
Subject: SRX04020960045
*** Problem Description **
Customer has an asp.net application with a dropdown menu and enable autopostback in
a fram
When users selects an item, it will do a postback to server. Before the postback
completes and the page refreshes, click the dropdown menu agai
the frame page will become blank out
Repro files
Main.ht
<html><frames et cols="150,*"><f rame name="contents" src=""><frame name="main" src="WebForm1.a spx"></frameset></html
WebForm1.aspx
<%@ Page language="c#" Codebehind="Web Form1.aspx.cs" AutoEventWireup ="false"
Inherits="nasty Bug.WebForm1" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><HTML><body MS_POSITIONING= "GridLayout " bgColor="lime"> <form id="Form1" method="post" runat="server"> <asp:DropDownLi st id="DropDownLis t1" style="Z-INDEX: 101; LEFT: 29px; POSITION:
absolute; TOP: 27px" runat="server" Width="122px" AutoPostBack="T rue"><asp:ListI tem Value="one">one </asp:ListItem><a sp:ListItem Value="two">two </asp:ListItem><a sp:ListItem Value="three">t hree</asp:ListItem><a sp:ListItem Value="four">fo ur</asp:ListItem></asp:DropDownLis t></form></body></HTML><><><><><> <><><><><><><>< ><><><><><><><> <><><><><><><>< ><><><><><><><> <><><><>
*** Resolution *** Jul 18 2003 12:16PM Amylu
Cause/Resolution
This is a bug with Internet explorer 6.0 sp1.
The original bug, it is closed and moved to longhorn and customer accept
workaroun
http://bugcheck/default.asp?URL=/Bugs/IEOESE/24828.as
New bug: windows bug: 74346
http://bugcheck/default.asp?URL=/Bug...Bugs/743465.as
In the meanwhile, we can workaround the problem by creating a client side onchange
event handler and delay the postback of a second
A better sample suggest by earlb
//need this using for the stringbuilder clas
using System.Text
private void Page_Load(objec t sender, System.EventArg s e
DropDownList1.A ttributes.Add(" onchange","test delay();")
Page.RegisterCl ientScriptBlock ("dropdown1",Cr eateClientFunct ion(DropDownLis t1.Uniqu
ID));
private string CreateClientFun ction(string str
StringBuilder func = new StringBuilder()
func.Append("<s cript language=\"jscr ipt\">")
func.Append("fu nction testdelay(){")
func.Append("se tTimeout(\"__do PostBack('" + str + "','')\", 1);")
func.Append("}" )
func.Append("</script>")
return func.ToString()
=============== =============== =============== =============== =============== ========
=============== =============== =============== =
Another code sample snippet (SRX02051660244 4) to workaround this problem, this puts
the script function at the before the starting HTML tag
private void Page_Load(objec t sender, System.EventArg s e
//create client site onchange even
DropDownList1.A ttributes.Add(" onchange","test delay()")
WriteFunction(D ropDownList1.Un iqueID)
// Put user code to initialize the page her
private void WriteFunction(s tring str
Response.Write( "<script
language=\"jscr ipt\">")
Response.Write( "function testdelay(){")
Response.Write( "setTimeout(\"_ _doPostBack('" +
str + "','')\", 1);")
Response.Write( "}")
Response.Write( "</script>")
VB.NET code Snippet
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Loa
'Put user code to initialize the page her
ListBox1.Attrib utes.Add("oncha nge", "testdelay( )"
WriteFunction(L istBox1.UniqueI D
End Su
Private Sub WriteFunction(B yVal str As System.String
Response.Write( "<script language=""jscr ipt"">"
Response.Write( "function testdelay()")
Response.Write( "{")
Response.Write( "setTimeout (")
Response.Write( """__doPostBack ('DropDownList1 ','')"", 1);")
Response.Write( "}")
Response.Write( "</script>")
End Sub
Michael Graham, MCSD
Microsoft Developer Support
(980) 776-9966
mg*****@microso ft.com
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