How To avoid Flickering in my following page...?

This is my aspx page.

(Default.aspx)

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default5.aspx.cs" Inherits="Default5" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head id="Head1" runat="server">

<title></title>

</head>

<body>

<form id="form2" runat="server">

<div>

    <br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />

    <br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />

    <br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />

<asp:dropdownlist id="drpFilterType" runat="server" AutoPostBack="True"

        onselectedindexchanged="drpFilterType_SelectedIndexChanged">

<asp:ListItem Value="MonthFilter">Month</asp:ListItem>

<asp:ListItem Value="YearFilter">Year</asp:ListItem>

<asp:ListItem Value="Other">Other</asp:ListItem>

    <asp:ListItem>last</asp:ListItem>

</asp:dropdownlist>

    <br /><br /><br /><br />

<asp:TextBox ID="TextBox1"  runat="server"></asp:TextBox>

    <br /><br /><br /><br /><br />

<asp:TextBox ID="TextBox2" runat="server">kaushal</asp:TextBox>

    <br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />

</div>

</form>

</body>

</html>

And this is my C# code for the page
(Default.aspx.cs)

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using System;

using System.Collections;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;
 
public partial class Default5 : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        TextBox1.Visible = false;

    }

    protected void drpFilterType_SelectedIndexChanged(object sender, EventArgs e)

    {

        if (drpFilterType.SelectedValue == "Other")

        {

            TextBox1.Visible = true;

            TextBox1.Focus();

        }

        else

        {

            TextBox1.Visible = false;

            TextBox2.Focus();

        }

    }

}

When I changed selected item of DropDownList it flickers.

Please help me to find a way around this.

Thank you.

Sep 8 '11 #1

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4699

Frinavale

9,735

Expert Mod 8TB

Replace the first <div> element (the root element) with an <asp:UpdatePanel ID="rootUpdatePanel"> </asp:UpdatePanel>.

The UpdatePanel uses Ajax which sends asynchronously posts back to the server. The browser will only update the portion of the page that is within the UpdatePanel when the request returns to the browser.

So, essentially you will be able to get rid of your flicker by placing the code that is involved with processing the request within an UpdatePanel. Hence, my suggestion of putting the entire content of your page within an UpdatePanel. But, you could change this so that only the controls that are involved with processing the DropDownList's SelectedIndexChanged event are within the UpdatePanel. Be aware that anything outside of the UpdatePanel will not be updated upon returning to the browser.

-Frinny

Sep 9 '11 #2

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