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app.html
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<!doctype html>
<html>
<head>
<title>ChatIO</title>
<style>
*
{ margin: 0; padding: 0; box-sizing: border-box; }
body { font: 13px Helvetica, Arial; }
form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; }
form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }
form button { width: 9%; background: rgb(150, 150, 225); border: none; padding: 10px; }
#messages { list-style-type: none; margin: 0; padding: 10px; }
#messages li { padding: 5px 5px; }
#messages li:nth-child(odd) { background: #eee; }
#main { overflow: auto; height: calc(100% - 30px); margin-bottom: 40px; }
#footer { position: fixed; bottom: 0; right: 0px; left: 0px;height: 30px; }
</style>
</head>
<body>
<div id="main">
<ul id="messages"></ul>
</div>
<div id="footer">
<form action="">
<input id="m" autocomplete="off" placeholder="Type here..." /><button>Send</button>
</form>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/4.0.0/socket.io.js"></script>
<script src="http://code.jquery.com/jquery-1.11.1.js"></script>
<script>
var socket = io();
$('form').submit(function(){
socket.emit('chatMessage', $('#m').val());
$('#m').val('');
return false;
});
socket.on('chatMessage', function(msg){
$('#messages').append($('<li>').text(JSON.stringify(msg)));
console.log(msg);
window.scrollTo(0, document.body.scrollHeight);
});
</script>
</body>
</html>