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<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Implements Interface="System.Web.UI.ICallbackEventHandler" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server" >
protected System.Collections.Specialized.ListDictionary catalog;
protected String returnValue;
public bool raiseCallbackEvent;
public bool getCallbackResult;
protected void Page_Load (object sender, EventArgs e)
{
String cbReference =
Page.ClientScript.GetCallbackEventReference (this,
"arg", "ReceiveServerData", "context", null, false);
String callbackScript;
callbackScript = "function CallServer(arg, context)" +
"{ " + cbReference + ";}";
Page.ClientScript.RegisterClientScriptBlock (this.GetType (),
"CallServer", callbackScript, true);
catalog = new System.Collections.Specialized.ListDictionary ();
catalog.Add ("monitor", 12);
catalog.Add ("laptop", 10);
catalog.Add ("keyboard", 23);
catalog.Add ("mouse", 17);
ListBox1.DataSource = catalog;
ListBox1.DataTextField = "key";
ListBox1.DataBind ();
}
protected override void OnPreInit (EventArgs e)
{
MonoTests.SystemWeb.Framework.WebTest t = MonoTests.SystemWeb.Framework.WebTest.CurrentTest;
if (t != null)
t.Invoke (this);
base.OnPreInit (e);
}
void System.Web.UI.ICallbackEventHandler.RaiseCallbackEvent (String eventArgument)
{
raiseCallbackEvent = true;
if (catalog[eventArgument] == null) {
returnValue = "-1";
}
else {
returnValue = catalog[eventArgument].ToString ();
}
}
String System.Web.UI.ICallbackEventHandler.GetCallbackResult ()
{
getCallbackResult = true;
if (getCallbackResult == true)
returnValue += "|true";
else
returnValue += "|false";
if (raiseCallbackEvent == true)
returnValue += "|true";
else
returnValue += "|false";
return returnValue;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" >
<head id="Head1" runat="server">
<title>Client Callback Example</title>
<script type="text/ecmascript">
function LookUpStock()
{
var lb = document.getElementById("ListBox1");
var product = lb.options[lb.selectedIndex].text;
CallServer(product, "");
}
function ReceiveServerData(rValue)
{
document.getElementById("ResultsSpan").innerHTML = rValue;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ListBox ID="ListBox1" Runat="server"></asp:ListBox>
<br />
<br />
<button type="Button" onclick="LookUpStock()">Look Up Stock</button>
<br />
<br />
Items in stock: <span id="ResultsSpan" runat="server"></span>
<br />
</div>
</form>
</body>
</html>
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