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| # 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> |
The Rails issue is well known, dunno what's breaking here, I think they wrap the body object somewhere and the errback/callback methods get lost on the way. Solution for now is to mount it in the config.ru rather than your routes.rb.
Yeah, I tried adding the Sinatra app as a Rails middleware and it worked. Cheers.
pretty good.
a nice alternative with websockets, with javascript polyfills
Just what I needed! Thanks a lot.
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...
rkj, do you have padrino version?
How many clients would this reasonable support, using say, thin?
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.
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) {
It seems like it has to do with the fact that I have mounted the Sinatra app inside a Rails app. I get it to work when running the Sinatra app by itself, but when running it inside the Rails app the connection seems to be dropped because the browser is reconnecting continuously and therefore I won't be able to stream messages from my message handler.
Is there anything I need to configure in Rails for this to work?