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index.html
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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JavaScript Web Worker</title>
<link rel="shortcut icon" type="image/png" href="/felipenmoura-felipe-nascimento-moura-favico.png"/>
<meta name="description" content="Tool for you to notice the difference that using Web Workers can make to your Web Application for processing extensive tasks.">
<meta name="keywords" content="web workers, workers, thread, multi-thread, JavaScript" />
<meta name="author" content="Felipe Nascimento de Moura">
<script type="text/javascript">
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-1270869-17', 'auto');
ga('send', 'pageview');
</script>
</head>
<body>
<a href="https://github.com/felipenmoura/demo-web-worker" class="github-corner" aria-label="View source on Github"><svg width="80" height="80" viewBox="0 0 250 250" style="fill:#151513; color:#fff; position: absolute; top: 0; border: 0; right: 0;" aria-hidden="true"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path></svg></a><style>.github-corner:hover .octo-arm{animation:octocat-wave 560ms ease-in-out}@keyframes octocat-wave{0%,100%{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:octocat-wave 560ms ease-in-out}}</style>
<div class="container">
Click a button and see the difference.<br/>
<div class="buttons-container">
<input type="button" value="Run" />
<input type="button" value="Run in a Worker" />
</div>
<textarea name="ta" id="ta" cols="60" rows="10" placeholder="Try typing here while processing"></textarea>
<div class="animated-container">
<span>CSS Animation</span>
<div class="animated"></div>
</div>
<div class="gif-container">
Animated<br/>
Gif
<div class="gif"></div>
</div>
<ol id="ol">
</ol>
</div>
<style>
html, body {
height: 100%;
font-family: sans-serif, arial, tahoma;
margin: 0;
padding: 0;
padding-top: 5px;
}
body {
background: #8f9ba3;
background: -moz-linear-gradient(45deg, #8f9ba3 0%, #afc6d6 99%);
background: -webkit-linear-gradient(45deg, #8f9ba3 0%,#afc6d6 99%);
background: linear-gradient(45deg, #8f9ba3 0%,#afc6d6 99%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#8f9ba3', endColorstr='#afc6d6',GradientType=1 );
}
* {
box-sizing: border-box;
}
.container {
position: relative;
margin: auto;
width: 405px;
height: 100%;
text-align: center;
}
textarea {
width: 405px;
}
.buttons-container {
width: 100%;
text-align: center;
}
input {
background: #2476d6;
color: #fff;
text-align: center;
width: 140px;
border: solid 1px #184e8d;
height: 40px;
margin: 20px 0;
font-size: 1rem;
}
.not-supported {
background-color: #ca9393;
border-color: #909090;
color: #e0e0e0;
font-size: .9rem;
}
.animated-container, .gif-container {
position: absolute;
background-color: #fff;
bottom: 5px;
left: 0;
width: 200px;
height: 60px;
z-index: 0;
overflow: hidden;
border: solid 1px #000;
text-align: center;
color: #fff;
font-size: 1.8rem;
padding-top: 13px;
}
.animated-container span {
position: relative;
z-index: 2;
}
.gif-container {
left: 205px;
color: #000;
background-image: url(bb8-star-wars.gif);
background-repeat: no-repeat;
background-position: right bottom;
background-size: 70% 100%;
background-color: #E6D7B3;
font-size: 1.5rem;
padding: 3px 5px;
text-align: left;
}
.animated {
position: absolute;
top: 0;
left: 0;
width: 40px;
height: 100%;
background: #f00;
z-index: 1;
border-left: solid 20px #f77;
box-shadow: -10px 0 0 0 #fbb, 10px 0 0 0 #fbb;
animation: slide 2s infinite linear;
}
@keyframes slide {
from {
left: -60px;
}
to {
left: 110%;
}
}
ol {
text-align: left;
border: dotted 3px #d0d0d0;
border-top: none;
padding-left: 25px;
margin-left: 2px;
line-height: 24px;
color: #fff;
background: rgba(240,255,255,.5);
margin: 0;
margin-top: -2px;
}
</style>
<script>
var ta = document.getElementById('ta');
var list = document.getElementById('ol');
var ipts = document.querySelectorAll('input');
function startTest (event) {
ta.focus();
let el = document.createElement('li');
el.innerHTML = 'Processing...';
el.classList.add('processing');
list.appendChild(el);
return {
end: evt=>{
console.log('END: ', evt.data || evt || evt.message);
el.innerHTML = 'DONE';
el.classList.remove('processing');
}
}
}
ipts[0].addEventListener('click', event=>{
let t = startTest(event);
setTimeout(function() {
t.end(expensiveFunction(Math.ceil(Math.random() * 99)));
}, 10);
});
ipts[1].addEventListener('click', event=>{
let t = startTest(event);
WWExpensiveFunction()
.then(result=>{
t.end(result);
})
.catch(err=>{
console.warn(err);
t.end(err);
});
});
function expensiveFunction (len) {
var i= 0,
l= 1000000000 + len,
r= 0;
console.log('starting');
for (; i<=l; i++) {
r = r + l - i; // some random calculation here :p
}
console.log('ending', r);
return r;
}
function WWExpensiveFunction () {
return new Promise((resolve, reject)=>{
var worker = new Worker('ww-calc.js');
worker.onmessage = function(event) {
console.log(event.data.result);
resolve(event.data);
};
worker.onerror = function(e) {
console.error(`Error: Line ${e.lineno} in ${e.filename}: ${e.message}`);
reject();
};
//start the worker
worker.postMessage({ command: 'calculate' });
})
}
if (!window.Worker) {
ipts[1].setAttribute('disabled', 'disabled');
ipts[1].value = "NOT SUPPORTED";
ipts[1].classList.add('not-supported');
}
</script>
<script type="js/worker" id="my-calc-script">
let data = arguments[0];
let c;
for (let i = 0; i<100000000; i++) {
c = i*2;
}
console.log('FINISHED', data);
return data + ' - ' + c;
</script>
<script>
// If you want to try this dynamic/embeded worker format, try the workerFromFunction function
function workerFromFunction (script) {
// Usamos o conteúdo da função que for passada
// caso seja uma tag de script, usamos o .textContent,
// caso seja uma função usamos o .toString
// Mas se for o conteúdo de uma tag script, colocamos ele dentro de uma função
let fn= script.textContent
? `function(){
${script.textContent}
}`
: script.toString();
// e na verdade, colocamos um wrapper ao redor da função ou script passados.
// este wraper fará com que o script escute mensagens e responda
// com o resultado
fn= `
self.onmessage = function(event) {
if (event.data.exec) {
let fn = ${fn};
self.postMessage(
fn.apply(self, event.data.clientData || [])
);
}
};
`;
// Viu a magia acontecendo na quinta linha? Executamos um apply do script
// ou função, especificando o this como o self, e passando os
// parâmetros recebidos.
// Este worker espera por uma mensagem com a propriedade "exec" para executar
// suas tarefas.
// Agora vamos tratar de construir o worker
// Para isso, no lugar de usarmos um outro arquivo.js, criaremos um objeto BLOB
// Esse objeto tem como conteúdo, o wrapper que criamos com a função dentro
// e o tipo "application/javascript"
let blob = new Blob([fn], {type: 'application/javascript'});
// E finalmente, instanciamos um worker usando este blob.
// Mas para usarmos um blob como referência ao Worker, precisamos construir
// uma URL para ele
let clientWorker = new Worker(window.URL.createObjectURL(blob));
// Pronto, agora temos uma instância de Worker criada dinamicamente
// mas para facilitar nossa vida, vamos promisificar isso tudo
return function () {
// Para passarmos o objeto arguments no postMessage, ele precisa ser um clone
// do arguments original
let args = [].slice.call(arguments);
// agora retornamos uma promise
return new Promise((resolve, reject)=>{
// escutamos as mensagens para resolvermos a promise
clientWorker.onmessage = function (result) {
resolve(result);
};
// e tratamos os possíveis erros
clientWorker.onerror = function (error) {
reject(error);
};
// e agora, finalmente, enviamos uma mensagem ao worker com o commando "exec"
// que ele espera, para iniciar sua execução
clientWorker.postMessage({ exec: true, clientData: args });
});
};
}
let w = workerFromFunction(function(data){
let c;
for (let i = 0; i<100000000; i++) {
c = i*2;
}
console.log('FINISHED', data);
return data + ' - ' + c;
});
// w(123).then(function(r){ console.info(r.data); }).catch(function(r){ console.error(r); });
let w2 = workerFromFunction(document.getElementById('my-calc-script'));
//w2("abc").then(function(r){ console.info(r.data); }).catch(function(r){ console.error(r); });
</script>
</body>
</html>