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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>FastDom: Aspect Ratio Example</title>
<style>
* {
box-sizing: border-box;
}
div {
float: left;
background: silver;
border: solid 2px white;
}
</style>
</head>
<body>
<label>Number of elements <input id="input" type="text" value="100" /></label>
<button id="withoutFastDom">Run without FastDom</button>
<button id="withRequestAnimationFrame">Run with requestAnimationFrame</button>
<button id="withFastDom">Run with FastDom</button>
<button id="resetbtn">reset</button>
<section id="perf"></section>
<section id="container"></section>
<script src="../fastdom.js"></script>
<script>
var n;
var start;
var divs;
// Setup
function reset(done) {
n = input.value;
divs = [];
fastdom.measure(function() {
var winWidth = window.innerWidth;
fastdom.mutate(function() {
container.innerHTML = '';
for (var i = 0; i < n; i++) {
var div = document.createElement('div');
div.style.width = Math.round(Math.random() * winWidth) + 'px';
container.appendChild(div);
divs.push(div);
}
if (done) done();
});
});
}
function setAspect(div, i) {
var aspect = 9 / 16;
var isLast = i === (n - 1);
var h = div.clientWidth * aspect;
div.style.height = h + 'px';
if (isLast) {
displayPerf(performance.now() - start);
}
}
function setAspectRequestAnimationFrame(div, i) {
var aspect = 9 / 16;
var isLast = i === (n - 1);
// READ
requestAnimationFrame(function() {
var h = div.clientWidth * aspect;
// WRITE
requestAnimationFrame(function() {
div.style.height = h + 'px';
if (isLast) {
displayPerf(performance.now() - start);
}
});
});
}
function setAspectFastDom(div, i) {
var aspect = 9 / 16;
var isLast = i === (n - 1);
// READ
fastdom.measure(function() {
var h = div.clientWidth * aspect;
// WRITE
fastdom.mutate(function() {
div.style.height = h + 'px';
if (isLast) {
displayPerf(performance.now() - start);
}
});
});
}
function displayPerf(ms) {
perf.textContent = ms + 'ms';
}
withoutFastDom.onclick = function() {
reset(function() {
start = performance.now();
divs.forEach(setAspect);
});
};
withFastDom.onclick = function() {
reset(function() {
start = performance.now();
divs.forEach(setAspectFastDom);
});
};
withRequestAnimationFrame.onclick = function() {
reset(function() {
start = performance.now();
divs.forEach(setAspectRequestAnimationFrame);
});
};
resetbtn.onclick = function() {
reset();
};
</script>
</body>
</html>
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