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Forked from agusmakmun/element.html
Created May 16, 2019 10:43
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spfjs progress bar: https://github.com/youtube/spfjs (JS framework for fast navigation)
Raw
element.html
<html>
<head>
<link rel="stylesheet" href="/css/progress-bar.css">
</head>
<body>
<h1>Your element goes here...</h1>
<!-- Link disabled: static link, SPF ins disabled -->
<a href="/destination">Go!</a>
<!-- Link enabled: a SPF request will be sent -->
<a class="spf-link" href="/destination">Go!</a>
<footer>
<div id="spfjs-progress-bar"><dt></dt><dd></dd></div>
<script src="/js/spf.js"></script>
<script src="/js/main.js"></script>
</footer>
</body>
</html>
Raw
main.js
// Copyright 2014 Google Inc. All rights reserved.
//
// Use of this source code is governed by The MIT License.
// See the LICENSE file for details.
(function () {
'use strict';
var html = document.getElementsByTagName('html')[0];
var body = document.body;
var progress = document.getElementById('spfjs-progress-bar');
var position = -1;
var start = -1;
var timer = -1;
// Animation states: start time, duration, progress complete, and css class.
var animation = {
// Most progress waiting for response; duration is 3x expected to
// accommodate slow networks and will be short-circuited by next step.
REQUEST: [0, 300, '95%', 'waiting'],
// Finish during short processing time.
PROCESS: [100, 25, '101%', 'waiting'],
// Fade it out slowly.
DONE: [125, 150, '101%', 'done']
};
html.className = html.className.replace('no-js', '');
if (!('ontouchstart' in window)) {
html.className = html.className + ' no-touch';
}
function setProgress(anim) {
clearTimeout(timer);
var elapsed = (new Date()).getTime() - start;
var scheduled = anim[0];
var duration = anim[1];
var percentage = anim[2];
var classes = anim[3];
var wait = scheduled - elapsed;
// Since navigation can often be faster than the animation,
// wait for the last scheduled step of the progress bar to complete
// before finishing.
if (classes == 'done' && wait > 0) {
timer = setTimeout(function() {
setProgress(anim);
}, wait);
return;
}
progress.className = '';
var ps = progress.style;
ps.transitionDuration = ps.webkitTransitionDuration = duration + 'ms';
ps.width = percentage;
if (classes == 'done') {
// If done, set the class now to start the fade-out and wait until
// the duration is over (i.e. the fade is complete) to reset the bar
// to the beginning.
progress.className = classes;
timer = setTimeout(function() {
ps.width = '0%';
}, duration);
} else {
// If waiting, set the class after the duration is over (i.e. the
// bar has finished moving) to set the class and start the pulse.
timer = setTimeout(function() {
progress.className = classes;
}, duration);
}
}
function clearProgress() {
clearTimeout(timer);
progress.className = '';
var ps = progress.style;
ps.transitionDuration = ps.webkitTransitionDuration = '0ms';
ps.width = '0%';
}
function handleRequest(event) {
start = (new Date()).getTime();
setProgress(animation.REQUEST);
}
function handleProcess(event) {
setProgress(animation.PROCESS);
window.scroll(0,0);
}
function handleDone(event) {
setProgress(animation.DONE);
handleScroll();
}
function handleScriptBeforeUnload(event) {
// If this script is going to be replaced with a new version,
// dispose before the new one is loaded.
if (event.detail.name == 'main') {
dispose();
}
}
function init() {
spf.init({
'cache-unified': true
});
document.addEventListener('spfrequest', handleRequest);
document.addEventListener('spfprocess', handleProcess);
document.addEventListener('spfdone', handleDone);
document.addEventListener('spfjsbeforeunload', handleScriptBeforeUnload);
}
function dispose() {
spf.dispose();
document.removeEventListener('spfprocess', handleRequest);
document.removeEventListener('spfrequest', handleProcess);
document.removeEventListener('spfdone', handleDone);
document.removeEventListener('spfjsbeforeunload', handleScriptBeforeUnload);
clearProgress();
}
init();
})();
Raw
progress-bar.css
/*** progress bar ***/
@-webkit-keyframes pulse {
30% { opacity: 0.6; }
60% { opacity: 0; }
100% { opacity: 0.6; }
}
@keyframes pulse {
30% { opacity: 0.6; }
60% { opacity: 0; }
100% { opacity: 0.6; }
}
#spfjs-progress-bar {
position: fixed;
z-index: 1000;
top: 0;
left: -6px;
width: 0%;
height: 2px;
background: #45C2FF;
border-radius: 1px;
/* the following transition times are overridden by JS */
-webkit-transition: width 150ms ease-out;
transition: width 150ms ease-out;
}
#spfjs-progress-bar.done {
opacity: 0;
}
#spfjs-progress-bar dd,
#spfjs-progress-bar dt {
position: absolute;
top: 0;
height: 2px;
box-shadow: #45C2FF 1px 0 6px 1px;
border-radius: 100%;
}
#spfjs-progress-bar dd {
opacity: 0.6;
width: 20px;
right: 0;
clip: rect(-6px, 22px, 14px, 10px);
}
#spfjs-progress-bar dt {
opacity: 0.6;
width: 180px;
right: -80px;
clip: rect(-6px, 90px, 14px, -6px);
}
#spfjs-progress-bar.waiting dd,
#spfjs-progress-bar.waiting dt {
-webkit-animation: pulse 2s ease-out 0s infinite;
animation: pulse 2s ease-out 0s infinite;
}
Raw
spfjs.js
/* SPF 24 (v2.4.0) | (c) 2012-2016 Google Inc. | License: MIT */
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