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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="SandBox.CometSample.Default" %>
<%--
//
// This code is released under Common Public License Version 1.0 (CPL)
// Full license text is available at http://www.opensource.org/licenses/cpl1.0.php
//
// Author : Karel Boek
// Date : Sept 29, 2009
// Contact : karel.boek@raskenlund.com
//
--%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function init() {
var send = document.getElementById('btnSend');
if (!send.addEventListener) {
send.addEventListener = function(type, listener, useCapture) {
attachEvent('on' + type, function() { listener(event) });
}
}
send.addEventListener('click', function() { send(); }, false);
hook();
}
function hook() {
var url = 'MyAsyncHandler.ashx?sessionId=<%= Session.SessionID %>';
var request = getRequestObject();
request.onreadystatechange = function() {
try {
if (request.readyState == 4) {
if (request.status == 200) {
document.getElementById('incoming').innerHTML += request.responseText + '<br />';
// immediately send a new request to tell the async handler that the client is
// ready to receive new messages;
hook();
}
else {
document.getElementById('incoming').innerHTML += request.responseText + '<br />';
}
}
}
catch (e) {
document.getElementById('incoming').innerHTML = "Error: " + e.message;
}
};
request.open('POST', url, true);
request.send(null);
}
function send() {
var message = document.getElementById('message').value;
var recipient = document.getElementById('<%= ddlSessions.ClientID %>').value;
var request = getRequestObject();
var url = 'MyMessageHandler.ashx?message=' + message + '&recipient=' + recipient;
var params = 'message=' + message + '&recipient=' + recipient;
document.getElementById('incoming').innerHTML += '<span style="color: #f00;">You wrote: ' + message + '</span><br />';
request.onreadystatechange = function() {
if (request.readyState == 4 && request.status != 200)
alert('Error ' + request.status + ' trying to send message');
};
request.open('POST', url, true);
request.send(params);
}
function getRequestObject() {
var req;
if (window.XMLHttpRequest && !(window.ActiveXObject)) {
try {
req = new XMLHttpRequest();
}
catch (e) {
req = false;
}
}
else if (window.ActiveXObject) {
try {
req = new ActiveXObject('Msxml2.XMLHTTP');
}
catch (e) {
try {
req = new ActiveXObject('Microsoft.XMLHTTP');
}
catch (e) {
req = false;
}
}
}
return req;
}
</script>
</head>
<%----%>
<body onload="setTimeout('init();', 500);">
<form id="form1" runat="server">
<div>
Self: <asp:Literal ID="ltlSessionId" runat="server" /><br />
Message: <input type="text" id="message" /><br />
Recipient: <asp:DropDownList ID="ddlSessions" runat="server" />
<br />
<input type="button" id="btnSend" value="Send Message!" onclick="send();" />
<hr />
<div id="incoming">
</div>
</div>
</form>
</body>
</html>
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