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document.addEventListener('DOMContentLoaded', function (e) { | |
var url = 'LargeFile.txt'; | |
var progress = 0; | |
var contentLength = 0; | |
fetch(url).then(function(response) { | |
// get the size of the request via the headers of the response | |
contentLength = response.headers.get('Content-Length'); | |
var pump = function(reader) { | |
return reader.read().then(function(result) { | |
// if we're done reading the stream, return | |
if (result.done) { | |
return; | |
} | |
// retrieve the multi-byte chunk of data | |
var chunk = result.value; | |
var text = ''; | |
// since the chunk can be multiple bytes, iterate through | |
// each byte while skipping the byte order mark | |
// (assuming UTF-8 with single-byte chars) | |
for (var i = 3; i < chunk.byteLength; i++) { | |
text += String.fromCharCode(chunk[i]); | |
} | |
// append the contents to the page | |
document.getElementById('content').innerHTML += text; | |
// report our current progress | |
progress += chunk.byteLength; | |
console.log(((progress / contentLength) * 100) + '%'); | |
// go to next chunk via recursion | |
return pump(reader); | |
}); | |
} | |
// start reading the response stream | |
return pump(response.body.getReader()); | |
}) | |
.catch(function(error) { | |
console.log(error); | |
}); | |
}); |
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