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December 14, 2011 12:55
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Simple Chat Application using the Sinatra Streaming API
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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> |
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) {
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pretty good.
a nice alternative with websockets, with javascript polyfills