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check if readyState == 3 makes the responseText available in browsers we care about ... yes, it does

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This commit is contained in:
Sven Fuchs 2012-10-06 17:29:16 +02:00
parent c6223341f4
commit 96ef9eb5d3
2 changed files with 61 additions and 0 deletions
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43
play/log.html Normal file
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>
var url = '/log'
var xhr, poll;
var length = 0;
function append(chunk) {
document.body.innerHTML = document.body.innerHTML + chunk;
}
function handleResponse() {
if (xhr.readyState != 4 && xhr.readyState != 3)
return;
if (xhr.readyState == 3 && xhr.status != 200)
return;
if (xhr.readyState == 4 && xhr.status != 200) {
clearInterval(poll);
}
log = xhr.responseText
chunk = log.slice(length)
length = log.length
append(chunk)
if (xhr.readyState == 4)
clearInterval(poll);
}
xhr = new XMLHttpRequest();
xhr.open('get', url);
xhr.onreadystatechange = handleResponse;
xhr.send(null);
poll = setInterval(handleResponse, 1);
</script>
</head>
<body></body>
</html>

18
play/log.ru Normal file
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require 'sinatra'
set :server, :thin
get '/' do
File.read('play/log.html')
end
get '/log' do
chars = (97..122).to_a
stream do |out|
1.upto(10000) do
out << chars[rand(chars.length)].chr
out << ' ' if rand(5) == 1
sleep 0.001
end
end
end