AJAX :: How To Get OnKeyPress On A Textbox

Mar 26, 2007

I am trying to implement the Microsoft Ajax.NET extensions to perform a
lookup on a key press of a text box.

What this will do is once a user enters a letter into the textbox, this will filter a list from a database and populate some filtered options for the user to choose in a seperate listbox. Any subsequent key presses will further filter this result set.

Now utilising the OnTextChanged property of the textbox, this works perfectly. Except you have to tab out of the textbox to trigger the event. So to make the on key press event work, in my Page_Load i added the onkeypress attribute to the textbox and specified this to trigger the text
changed event. tbSearchTerm.Attributes.Add("onkeypress",

Page.ClientScript.GetPostBackEventReference(tbSearchTerm, ""));

Now this kind of seems to work, but has a one character delay.


action: I enter the character "A" into the textbox.
result: Nothing happens

action: I enter an additional character "B" into the textbox
result: Results for the letter "A" are now returned

action: I enter my third character "C" into the textbox
result: Results for a search for letters "AB" are now returned.

This is causing a most undesirable effect.

How is one supposed to utilise an OnKeyPress action in the AJAX.Net

This was downloaded from:[URL]

And i have been unable to find another solution to this problem.

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I have run across an issue recently while incorporating AJAX into one of my applications. The issue demonstrates either my fundamental lack of understanding about how this technology works, or a problem in my implementation of it. I have created an bare-bones simple example to demonstrate what I'm seeing. I know how to remedy the problem, but I'd prefer the discussion center around *WHY* it's happening.

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdatePanel ID="up1" runat="server">
<asp:Button ID="Button1" runat="server" Text="Load UC1" OnClick="Button1_Click" />
<br />
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
Button1_Click Event:
protected void Button1_Click (object sender, EventArgs e)
Control ctrl = new Control();
ctrl = Page.LoadControl("uc1.ascx");
ctrl.ID = "DynamicCtrl";
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="uc1.ascx.cs" Inherits="uc1" %>
UserControl 1 <br />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
using System;
using System.Web.UI;
public partial class uc1 : System.Web.UI.UserControl
protected void Page_Load(object sender, EventArgs e)
//use either of these two lines in the example
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