Hi,
Iam trying to check the Client Side CallBack Feature in ASP.NET
Iam able to call th RaiseCallbackEv ent from the Client Side Javascript
Function but when I go to the debug mode to check the Value of the
TextBox it always remains "" or empty rather than the value I gave as
input into the text box before invoking the RaiseCallBack.
Code is simple
1 WebForm.aspx Page
<%@ Page Language="C#" AutoEventWireup ="true" %>
<%@ Implements Interface="Syst em.Web.UI.ICall backEventHandle r" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://
www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dt d">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Untitl ed Page</title>
<script type="text/javascript">
function LookUpStock()
{
var lb = document.getEle mentById("ListB ox1");
var product = "";//lb.options[lb.selectedInde x].text;
CallServer(prod uct, "");
}
function ReceiveServerDa ta(rValue)
{
document.getEle mentById("Resul tsSpan").innerH TML = rValue;
}
</script>
<script runat="server">
protected System.Collecti ons.Specialized .ListDictionary
catalog;
protected String returnValue;
void Page_Load(objec t sender, EventArgs e)
{
if (!Page.IsPostBa ck)
{
String cbReference =
Page.ClientScri pt.GetCallbackE ventReference(t his,
textbox1.Text, "ReceiveServerD ata", "context");
String callbackScript;
callbackScript = "function CallServer(arg, context)" +
"{ " + cbReference + ";}";
Page.ClientScri pt.RegisterClie ntScriptBlock(t his.GetType(),
"CallServer ", callbackScript, true);
}
}
public string GetCallbackResu lt()
{
bool btest = Page.IsCallback ;
return textbox1.Text; // This always comes as empty in
debug mode why?????
}
public void RaiseCallbackEv ent(String eventArgument)
{
//
Response.Write( "OK:::::::::::: ::::::::::::::: ::::::::::::::: ::::::::::::::: ::::::::::::::: ::::::");
// if (catalog[eventArgument] == null)
// {
////////// returnValue = "-1";
//}
// else
{
returnValue = textbox1.Text; //
catalog[eventArgument].ToString();
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ListBox ID="ListBox1" Runat="server"> </asp:ListBox>
<br />
<br />
<button type="Button" onclick="LookUp Stock()">Look Up Stock</
button>
<br />
<br />
Items in stock: <span id="ResultsSpan " runat="server"> </span>
<br />
<br />
<asp:TextBox ID="textbox1" runat="server"> </asp:TextBox>
<br />
</div>
</form>
</body>
</html>
Thanks in Advance
Regards
Seshu
