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rkh/chat.rb

Created December 14, 2011 12:55
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Simple Chat Application using the Sinatra Streaming API
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chat.rb
# coding: utf-8
require 'sinatra'
set server: 'thin', connections: []
get '/' do
halt erb(:login) unless params[:user]
erb :chat, locals: { user: params[:user].gsub(/\W/, '') }
end
get '/stream', provides: 'text/event-stream' do
stream :keep_open do |out|
settings.connections << out
out.callback { settings.connections.delete(out) }
end
end
post '/' do
settings.connections.each { |out| out << "data: #{params[:msg]}\n\n" }
204 # response without entity body
end
__END__
@@ layout
<html>
<head>
<title>Super Simple Chat with Sinatra</title>
<meta charset="utf-8" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
</head>
<body><%= yield %></body>
</html>
@@ login
<form action='/'>
<label for='user'>User Name:</label>
<input name='user' value='' />
<input type='submit' value="GO!" />
</form>
@@ chat
<pre id='chat'></pre>
<script>
// reading
var es = new EventSource('/stream');
es.onmessage = function(e) { $('#chat').append(e.data + "\n") };
// writing
$("form").live("submit", function(e) {
$.post('/', {msg: "<%= user %>: " + $('#msg').val()});
$('#msg').val(''); $('#msg').focus();
e.preventDefault();
});
</script>
<form>
<input id='msg' placeholder='type message here...' />
</form>
@mig-hub
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mig-hub commented May 23, 2013

Nice,

Since no specific version of jQuery is requested, it doesn't work anymore on the Heroku demo.
Because "live" was removed.
It works with this revision

You probably knew this as it was a year ago, but just in case...

@akemrir
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akemrir commented Sep 27, 2013

rkj, do you have padrino version?

@mcfiredrill
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How many clients would this reasonable support, using say, thin?

@multiholle
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Change line 29 to <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.js"></script> if you have trouble getting it to run. There was an api change in JQuery 1.9.

@flibbles
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As @multiholle pointed out, JQuery changed.

If you want to use the latest version of jquery, the line:

$("form").live("submit", function(e) {

can be changed to:

$("body").on("submit", "form", function(e) {

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