Hi Experts!
Apropos MSDN link:
[.NET Framework 4 - ASP.NET]
Implementing Client Callbacks Programmaticall y Without Postbacks in ASP.NET Web Pages
Using the code from the above link in the following code snippet, if you keep a break point on the statement "if (IsPostBack)" in the Page_Load event. The control moves into the "if (IsPostBack)" block after the alert, which mean that it is a Postback.
Then, how come you say "...Without Postbacks"?
I am getting confused here.
Can you help please?
Code Snippet:
Thanks.
Apropos MSDN link:
[.NET Framework 4 - ASP.NET]
Implementing Client Callbacks Programmaticall y Without Postbacks in ASP.NET Web Pages
Using the code from the above link in the following code snippet, if you keep a break point on the statement "if (IsPostBack)" in the Page_Load event. The control moves into the "if (IsPostBack)" block after the alert, which mean that it is a Postback.
Then, how come you say "...Without Postbacks"?
I am getting confused here.
Can you help please?
Code Snippet:
Code:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="ASPCS2008ClientCallbacksProgrammatically._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ Implements Interface="System.Web.UI.ICallbackEventHandler" %>
<script runat="server">
string aStringValue;
public void RaiseCallbackEvent(String eventArgument)
{
aStringValue = eventArgument;
}
public string GetCallbackResult()
{
return aStringValue;
}
protected void Page_Load(object sender, EventArgs e)
{
ClientScriptManager cm = Page.ClientScript;
String cbReference = cm.GetCallbackEventReference(this, "arg", "ReceiveServerData", "");
String callbackScript = "function CallServer(arg, context) {" + cbReference + "; }";
cm.RegisterClientScriptBlock(this.GetType(), "CallServer", callbackScript, true);
if (IsPostBack)
{
}
if (IsCallback)
{
}
}
</script>
Code:
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
<script type="text/javascript">
function ReceiveServerData(arg, context) {
Message.innerText = 'Processed callback.';
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input type="button" value="Callback"
onclick="CallServer(1, alert('Callback'))"/>
<br />
<span id="Message"></span>
</div>
</form>
</body>
</html>
Thanks.
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