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index.html
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<html>
<head>
<title>IO Chatting</title>
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.3.1.min.js"
integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8="
crossorigin="anonymous"></script>
<script src="/socket.io/socket.io.js"></script>
<style>
body {
margin-top:30px;
}
#messageArea {
display:none;
}
</style>
</head>
<body>
<div class="container">
<div id="userFormArea" class=row>
<div class="col-md-12">
<form id="userForm">
<div class="form-group">
<label>Enter Username</label>
<input class="form-control" id="username"/>
<br />
<input type="submit" class="btn btn-primary" value="Login"/>
</div>
</form>
</div>
</div>
<div id="messageArea" class="row">
<div class="col-md-4">
<div class="well">
<h3>Online Users</h3>
<ul class="list-group" id="users"></ul> </ul>
</div>
</div>
<div class="col-md-8">
<div class="chat" id="chat"></div>
<form id="messageForm">
<div class="form-group">
<label>Enter Message</label>
<textarea class="form-control" id="message"></textarea>
<br />
<input type="submit" class="btn btn-primary" value="Send Message"/>
</div>
</form>
</div>
</div>
</div>
<script>
$(function() {
var socket = io.connect();
var $messageForm = $('#messageForm');
var $message = $('#message');
var $chat = $('#chat');
var $messageArea = $('#messageArea');
var $userForm = $('#userForm');
var $userFormArea = $('#userFormArea');
var $users = $('#users');
var $username = $('#username');
$messageForm.submit(function(e) {
e.preventDefault();
socket.emit('send message', $message.val());
$message.val('');
});
socket.on('new message', function(data) {
$chat.append('<div class="well">' +
data.msg + '</div>');
});
$userForm.submit(function(e) {
e.preventDefault();
socket.emit('new user', $username.val(), function(data) {
if(data) {
$userFormArea.hide();
$messageArea.show();
}
});
$username.val('');
});
});
</script>
</body>
</html>