Server Push
Polling and jQuery
Code Google FAQ, webSockets plugin for jQuery
Think of Socket.IO as the jQuery of HTML5 WebSockets. No two browser vendors will implement the WebSockets protocol exactly alike. Socket.IO tries to normalize those differences.
.--------. .----------.
| | | |
| user | <-----------> | server |
| client | | |
| | | |
.--------. .----------.
^
.-------------. |
| | |
| admin | --------------.
| client |
| |
| <do push> |
| |
.-------------.
Two ways to implement it :
- web socket(s)
- ajax
Exemple minim
<html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script type="text/javascript">
var socket = new WebSocket( 'ws://localhost:8181/websession' ) ;
socket.onopen = function() {
alert( 'handshake successfully established. May send data now...' ) ;
};
socket.onclose = function() {
alert( 'connection closed' ) ;
};
</script>
</head>
<body>
</body>
</html>
Nice demos
