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Implement Script Callback Framework in ASP.NET 1.x

, 2 Aug 2004
It allows calls to server events from client script code without causing the page to post back and refresh.
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;

namespace ScriptCallbackFramework
	/// <summary>
	/// Implement the in IClientCallbackEventHandler Page Control
	/// </summary>
	public class index : PageTemplate, IClientCallbackEventHandler
		#region Member Vars
		protected System.Web.UI.HtmlControls.HtmlInputButton IncreaseButton;
		protected System.Web.UI.HtmlControls.HtmlInputText txtValue;
		protected ScriptCallbackFramework.AgeCalculator AgeCalculator1;
		protected System.Web.UI.HtmlControls.HtmlForm Form1;
		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
			this.Load += new System.EventHandler(this.Page_Load);

		#region Page_Load
		private void Page_Load(object sender, System.EventArgs e)
			if (!Page.IsPostBack)
				//	Callback synchronously
				IncreaseButton.Attributes["onclick"] = GetSyncCallbackEventReference
						String.Format("document.getElementById('{0}').value", txtValue.UniqueID),
						String.Format("document.getElementById('{0}')", txtValue.UniqueID),

		#region IClientCallbackEventHandler Members

		public string RaiseClientCallbackEvent(string eventArgument)
			if (eventArgument == null || eventArgument == String.Empty)
				return "1";
			return Convert.ToString(Convert.ToInt32(eventArgument) + 1);

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About the Author

Elvin Cheng
Singapore Singapore
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.

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