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shuffle.html
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shuffle.html
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<!DOCTYPE html>
<html>
<!--
Copyright 2011 Google Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<head>
<title>Shuffle Comparison</title>
<script src="../../src/mutation-summary.js"></script>
<body>
Shuffle moves: <input id="moveCount" type="number" value="1000">
<select id="watchType" onchange="setupWatch();">
<option value="event">DOM Mutation Events</option>
<option value="observer">DOM Mutation Observers</option>
<option value="summary">The Mutation Summary Library</option>
</select>
<button onclick="shuffle();">Shuffle!</button>
<ul id="deck"><li>Ace</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>Jack</li><li>Queen</li><li>King</li></ul>
<h3 id="report"></h3>
</body>
<script>
var changeCount;
var callbacks;
var watchType;
var observer;
var observerSummary;
function shuffle() {
prepReport();
var deck = document.getElementById('deck');
var moveCount = Number(document.getElementById('moveCount').value);
while(moveCount-- > 0) {
var randomCard = deck.childNodes[randInt(0, deck.childNodes.length - 1)];
deck.removeChild(randomCard);
var randomPlace = deck.firstChild;
var randomCount = randInt(0, deck.childNodes.length - 1);
while(randomCount-- > 0) {
randomPlace = randomPlace.nextSibling;
}
deck.insertBefore(randomCard, randomPlace);
}
setTimeout(report, 0);
}
function mutationEventIsFiring(e) {
callbacks++;
changeCount++;
}
function observeMutations(mutations) {
callbacks++;
changeCount += mutations.length;
}
function handleSummary(summaries) {
callbacks++;
var shuffleChanges = summaries[0];
changeCount += shuffleChanges.reordered.length;
}
function randInt(start, end) {
return Math.round(Math.random() * (end-start) + start);
}
function prepReport() {
document.getElementById('report').innerText = '';
changeCount = 0;
callbacks = 0;
}
function setupWatch() {
var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;
switch(watchType) {
case 'event':
document.removeEventListener('DOMNodeInserted', mutationEventIsFiring);
document.removeEventListener('DOMNodeRemoved', mutationEventIsFiring);
break;
case 'observer':
observer.disconnect();
break;
case 'summary':
observerSummary.disconnect();
break;
}
watchType = document.getElementById('watchType').value;
switch(watchType) {
case 'event':
document.addEventListener('DOMNodeInserted', mutationEventIsFiring);
document.addEventListener('DOMNodeRemoved', mutationEventIsFiring);
window.report = function() {
document.getElementById('report').textContent = changeCount + ' events fired';
}
break;
case 'observer':
observer = new MutationObserver(observeMutations);
observer.observe(document, { childList: true, subtree: true});
window.report = function() {
document.getElementById('report').textContent = changeCount + ' mutations reported in ' + callbacks + ' callbacks';
}
break;
case 'summary':
observerSummary = new MutationSummary({ callback: handleSummary, queries: [{ all: true }]});
window.report = function() {
document.getElementById('report').textContent = changeCount + ' reorders reported in ' + callbacks + ' callbacks';
}
break;
}
}
window.addEventListener('DOMContentLoaded', setupWatch);
</script>
</html>