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using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Text;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
namespace ScriptCallbackFramework
{
/// <summary>
/// Implemenet IClientCallbackEventHandler in the Server Control
/// </summary>
[DefaultProperty("Text"),
ToolboxData("<{0}:AgeCalculator runat=server></{0}:AgeCalculator>")]
public class AgeCalculator : Control, IClientCallbackEventHandler, IPostBackEventHandler, IPostBackDataHandler
{
#region OnInit
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
if (Page != null)
{
Page.RegisterRequiresPostBack(this);
string script = String.Empty;
// ShowAgeHandler JavaScript function
script = "<script language=\"javascript\">function ShowAgeHandler(responseText, context) { alert(\"Your age is \" + responseText); } </script>";
Page.RegisterClientScriptBlock("ShowAgeHandler", script);
// ShowAgeErrorHandler JavaScript function
script = "<script language=\"javascript\">function ShowAgeErrorHandler(responseText, context) { alert(\"Which year you were born?\"); if (context != null) context.value = \"\"; }</script>";
Page.RegisterClientScriptBlock("ShowAgeErrorHandler", script);
}
}
#endregion
#region OnLoad
protected override void OnLoad(EventArgs e)
{
Label l = new Label();
l.Text = "Please enter your year of birth : ";
Controls.Add(l);
TextBox txtBox = new TextBox();
txtBox.ID = "txtAge";
txtBox.Width = 50;
Controls.Add(txtBox);
HtmlInputButton btn = new HtmlInputButton();
btn.ID = "CalculateAgeButton";
btn.Value = "Calculate Age";
btn.Attributes["onclick"] = PageTemplate.GetAsyncCallbackEventReference
(
this,
String.Format("document.getElementById('{0}').value", txtBox.UniqueID),
"ShowAgeHandler",
String.Format("document.getElementById('{0}')", txtBox.UniqueID),
"ShowAgeErrorHandler"
);
Controls.Add(btn);
base.OnLoad (e);
}
#endregion
#region IClientCallbackEventHandler Members
public string RaiseClientCallbackEvent(string eventArgument)
{
return Convert.ToString(DateTime.Now.Year - Convert.ToInt32(eventArgument));
}
#endregion
#region IPostBackEventHandler Members
public void RaisePostBackEvent(string eventArgument)
{
// TODO: Add AgeCalculator.RaisePostBackEvent implementation
}
#endregion
#region IPostBackDataHandler Members
public void RaisePostDataChangedEvent()
{
// TODO: Add AgeCalculator.RaisePostDataChangedEvent implementation
}
public bool LoadPostData(string postDataKey, NameValueCollection postCollection)
{
// TODO: Add AgeCalculator.LoadPostData implementation
return false;
}
#endregion
}
}
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Elvin Cheng is currently living in Woodlands, Singapore. He has been developing applications with the .NET Framework, using C# and ASP.NET since October 2002. Elvin specializes in building Real-time monitoring and tracking information system for Semi-conductor manufacturing industry. During his spare time, he enjoys reading books, watching movie and gym.