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@ebidel
ebidel / polymer-perf-bookmarklet.js
Last active Jul 2, 2019
Polymer performance numbers bookmarklet
View polymer-perf-bookmarklet.js
javascript:(function(){(function printStats(){var loadTimes=window.chrome.loadTimes();firstPaint=loadTimes.firstPaintTime*1000;firstPaintTime=firstPaint-(loadTimes.startLoadTime*1000);console.info('First paint took',firstPaintTime,'ms');console.info('Load took',performance.timing.loadEventStart-performance.timing.navigationStart,'ms');var instances=0;if(parseFloat(Polymer.version)<1){instances=[].slice.call(document.querySelectorAll('html /deep/ *')).filter(function(el){return el.localName.indexOf('-')!=-1||el.getAttribute('is');}).length;}else{instances=Polymer.telemetry.instanceCount;}console.info('Custom element instances:',instances);var reflectCount=0;if(Polymer.telemetry){console.info('=== Properties set to reflectToAttribute ===');Polymer.telemetry.registrations.forEach(function(el){for(var prop in el.properties){if(el.properties[prop].reflectToAttribute){console.log(el.is+'.'+prop);reflectCount++;}}});}else{console.info('=== Properties set to reflect ===');Polymer.elements.forEach(function(el){for(var
@ebidel
ebidel / sw_caching_size.js
Last active Jul 1, 2019
Print service worker cache sizes and overall bytes cached.
View sw_caching_size.js
/**
* @author ebidel@ (Eric Bidelman)
* License Apache-2.0
*/
// Prints the bytes cached by service worker. Breaks out each cache
// overall in-memory bytes used by the Cache Storage API for the site.
async function getCacheStoragesAssetTotalSize() {
// Note: opaque (i.e. cross-domain, without CORS) responses in the cache will return a size of 0.
@ebidel
ebidel / fancy-tabs-demo.html
Last active Jun 28, 2019
Fancy tabs web component - shadow dom v1, custom elements v1, full a11y
View fancy-tabs-demo.html
<script>
function execPolyfill() {
(function(){
// CustomElementsV1.min.js v1 polyfill from https://github.com/webcomponents/webcomponentsjs/tree/v1/src/CustomElements/v1.
/*
Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
@ebidel
ebidel / feature_detect_es_modules.js
Last active Jun 16, 2019
Feature detect ES modules: both static import and dynamic import()
View feature_detect_es_modules.js
<!--
Complete feature detection for ES modules. Covers:
1. Static import: import * from './foo.js';
2. Dynamic import(): import('./foo.js').then(module => {...});
Demo: http://jsbin.com/tilisaledu/1/edit?html,output
Thanks to @_gsathya, @kevincennis, @rauschma, @malyw for the help.
-->
@ebidel
ebidel / unregistered_custom_elements.bookmarklet.js
Last active May 30, 2019
Logs any custom elements on a page that are not registerd (e.g. missing an HTML import)
View unregistered_custom_elements.bookmarklet.js
javascript:(function(){function isUnregisteredCustomElement(el){if(el.constructor==HTMLElement){console.error("Found unregistered custom element:",el);return true;}return false;}function isCustomEl(el){return el.localName.indexOf('-')!=-1||el.getAttribute('is');}var allCustomElements=document.querySelectorAll('html /deep/ *');allCustomElements=Array.prototype.slice.call(allCustomElements).filter(function(el){return isCustomEl(el);});var foundSome=false;for(var i=0,el;el=allCustomElements[i];++i){if(isUnregisteredCustomElement(el)){foundSome=true;}}if(foundSome){alert('Oops: found one or more unregistered custom elements in use! Check the console.');}else{alert('Good: All custom elements are registered :)');}})();
@ebidel
ebidel / handle_file_upload.php
Created Apr 18, 2012
Uploading files using xhr.send(FormData) to PHP server
View handle_file_upload.php
<?php
$fileName = $_FILES['afile']['name'];
$fileType = $_FILES['afile']['type'];
$fileContent = file_get_contents($_FILES['afile']['tmp_name']);
$dataUrl = 'data:' . $fileType . ';base64,' . base64_encode($fileContent);
$json = json_encode(array(
'name' => $fileName,
'type' => $fileType,
'dataUrl' => $dataUrl,
@ebidel
ebidel / app.html
Last active May 14, 2019
Fast Polymer app loading - optimized for first render, progressively enhanced lazy loading
View app.html
<!DOCTYPE html>
<html>
<head>
<style>
body.loading #splash {
opacity: 1;
}
#splash {
position: absolute;
top: 0;
@ebidel
ebidel / dom-property-watcher.js
Created Sep 12, 2015
DOM property watcher using ES6 proxies.
View dom-property-watcher.js
// Watch accesses/sets on a DOM element property.
function watchPropsOn(el) {
return new Proxy(el, {
get(target, propKey, receiver) {
//return Reflect.get(target, propKey, receiver);
console.log('get', propKey);
return el[propKey];
},
set(target, propKey, value, receiver) {
console.log('set', propKey, value);
@ebidel
ebidel / download_chrome41.js
Last active May 6, 2019
For when you need to test your site in Google Search (Chrome 41).
View download_chrome41.js
/**
* Copyright 2018 Google Inc. All rights reserved.
*
* 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
@ebidel
ebidel / object-observe-proxy-polyfill.js
Last active May 5, 2019
Object.observe() polyfill using ES6 Proxies (POC)
View object-observe-proxy-polyfill.js
// An `Object.observe()` "polyfill" using ES6 Proxies.
//
// Current `Object.observe()` polyfills [1] rely on polling
// to watch for property changes. Proxies can do one better by
// observing property changes to an object without the need for
// polling.
//
// Known limitations of this technique:
// 1. the call signature of `Object.observe()` will return the proxy
// object. The original object needs to be overwritten with this return value.
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