Watch TextBox, CheckBox and radiobutton auto post back action (C#)
<%@ Page language="c#" src="EventTracker.aspx.cs" AutoEventWireup="false" Inherits="EventTracker" %>
<HTML>
<body>
<form id="Form1" method="post" runat="server">
<P><h3>Controls being monitored for change events:</h3>
<asp:TextBox id="txt" runat="server" AutoPostBack="True">Text box auto post back</asp:TextBox><BR>
<BR>
<asp:CheckBox id="chk" runat="server" AutoPostBack="True"></asp:CheckBox><BR>
<BR>
<asp:RadioButton id="opt1" runat="server" GroupName="Sample" AutoPostBack="True"></asp:RadioButton>
<asp:RadioButton id="opt2" runat="server" GroupName="Sample" AutoPostBack="True"></asp:RadioButton><BR>
<BR>
<BR>
<h3>List of events:</h3>
<P></P>
<P>
<asp:ListBox id="lstEvents" runat="server" Width="355px" Height="256px"></asp:ListBox><BR>
</P>
</form>
</body>
</HTML>
<%--
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
public class EventTracker : System.Web.UI.Page
{
protected System.Web.UI.WebControls.TextBox txt;
protected System.Web.UI.WebControls.CheckBox chk;
protected System.Web.UI.WebControls.RadioButton opt1;
protected System.Web.UI.WebControls.RadioButton opt2;
protected System.Web.UI.WebControls.ListBox lstEvents;
private void Page_Load(object sender, System.EventArgs e)
{
Log("<< Page_Load >>");
}
#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.txt.TextChanged += new System.EventHandler(this.CtrlChanged);
this.chk.CheckedChanged += new System.EventHandler(this.CtrlChanged);
this.opt1.CheckedChanged += new System.EventHandler(this.CtrlChanged);
this.opt2.CheckedChanged += new System.EventHandler(this.CtrlChanged);
this.Load += new System.EventHandler(this.Page_Load);
this.PreRender += new System.EventHandler(this.EventTracker_PreRender);
}
#endregion
private void Log(string entry)
{
lstEvents.Items.Add(entry);
// Select the last item to scroll the list so the most recent
// entries are visible.
lstEvents.SelectedIndex = lstEvents.Items.Count - 1;
}
private void EventTracker_PreRender(object sender, System.EventArgs e)
{
// When the Page.UnLoad event occurs it is too late
// to change the list.
Log("Page_PreRender");
}
private void CtrlChanged(Object sender, EventArgs e)
{
// Find the control ID of the sender.
// This requires converting the Object type into a Control class.
string ctrlName = ((Control)sender).ID;
Log(ctrlName + " Changed");
}
}
--%>
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