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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.
<%@ Register TagPrefix="uc" TagName="Employee" Src="/ScriptCallbackFramework/Employee.ascx" %>
<%@ Register TagPrefix="uc" Namespace="ScriptCallbackFramework" Assembly="ScriptCallbackFramework" %>
<%@ Page language="c#" Codebehind="index.aspx.cs" AutoEventWireup="false" Inherits="ScriptCallbackFramework.index" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
	<HEAD>
		<title>Script Callback Framework (DEMO)</title>
		<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
		<meta name="CODE_LANGUAGE" Content="C#">
		<meta name="vs_defaultClientScript" content="JavaScript">
		<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
		<script language="javascript">
		function IncreaseValueHandler(responseText, context) {
			if (context != null)
				context.value = responseText;
		}
		</script>
	</HEAD>
	<body MS_POSITIONING="GridLayout">
		<form id="Form1" method="post" runat="server">
			<br>
			<br>
			<br>
			<br>
			<TABLE id="Table1" style="Z-INDEX: 103; LEFT: 8px; POSITION: absolute; TOP: 8px" cellSpacing="20"
				cellPadding="1" width="100%">
				<TR bgcolor="aliceblue">
					<TD style="WIDTH: 100%" colSpan="2">
						<font style="FONT-WEIGHT: bold; COLOR: highlight; FONT-FAMILY: Arial">Implement 
							IClientCallbackEventHandler interface on Page</font>
						<br>
						<P>
							<INPUT style="WIDTH: 56px; HEIGHT: 22px" type="text" runat="server" id="txtValue" size="4"
								value="0" readOnly> <INPUT type="button" value="Increase Value" runat="server" id="IncreaseButton" title="Increase value synchronously"></P>
					</TD>
				</TR>
				<TR bgcolor="ghostwhite">
					<TD colSpan="2">
						<font style="FONT-WEIGHT: bold; COLOR: highlight; FONT-FAMILY: Arial">Implement 
							IClientCallbackEventHandler interface on Server Control</font>
						<br>
						<P>
							<uc:AgeCalculator id="AgeCalculator1" runat="server"></uc:AgeCalculator></P>
					</TD>
				</TR>
				<TR bgcolor="azure">
					<TD colSpan="2">
						<font style="FONT-WEIGHT: bold; COLOR: highlight; FONT-FAMILY: Arial">Implement 
							IClientCallbackEventHandler interface on User Control</font>
						<br>
						<P>
							<uc:Employee id="employee1" runat="server"></uc:Employee></P>
					</TD>
				</TR>
			</TABLE>
		</form>
	</body>
</HTML>

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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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