Initial commit
This commit is contained in:
Kirchik
@@ -0,0 +1,166 @@
|
||||
/**
|
||||
* A lightweight youtube embed. Still should feel the same to the user, just MUCH faster to initialize and paint.
|
||||
*
|
||||
* Thx to these as the inspiration
|
||||
* https://storage.googleapis.com/amp-vs-non-amp/youtube-lazy.html
|
||||
* https://autoplay-youtube-player.glitch.me/
|
||||
*
|
||||
* Once built it, I also found these:
|
||||
* https://github.com/ampproject/amphtml/blob/master/extensions/amp-youtube (👍👍)
|
||||
* https://github.com/Daugilas/lazyYT
|
||||
* https://github.com/vb/lazyframe
|
||||
*/
|
||||
class LiteYTEmbed extends HTMLElement {
|
||||
connectedCallback() {
|
||||
this.videoId = this.getAttribute('videoid');
|
||||
|
||||
let playBtnEl = this.querySelector('.lty-playbtn');
|
||||
// A label for the button takes priority over a [playlabel] attribute on the custom-element
|
||||
this.playLabel = (playBtnEl && playBtnEl.textContent.trim()) || this.getAttribute('playlabel') || 'Play';
|
||||
|
||||
/**
|
||||
* Lo, the youtube placeholder image! (aka the thumbnail, poster image, etc)
|
||||
*
|
||||
* See https://github.com/paulirish/lite-youtube-embed/blob/master/youtube-thumbnail-urls.md
|
||||
*
|
||||
* TODO: Do the sddefault->hqdefault fallback
|
||||
* - When doing this, apply referrerpolicy (https://github.com/ampproject/amphtml/pull/3940)
|
||||
* TODO: Consider using webp if supported, falling back to jpg
|
||||
*/
|
||||
if (!this.style.backgroundImage) {
|
||||
this.style.backgroundImage = `url("https://i.ytimg.com/vi/${this.videoId}/hqdefault.jpg")`;
|
||||
}
|
||||
|
||||
// Set up play button, and its visually hidden label
|
||||
if (!playBtnEl) {
|
||||
playBtnEl = document.createElement('button');
|
||||
playBtnEl.type = 'button';
|
||||
playBtnEl.classList.add('lty-playbtn');
|
||||
this.append(playBtnEl);
|
||||
}
|
||||
if (!playBtnEl.textContent) {
|
||||
const playBtnLabelEl = document.createElement('span');
|
||||
playBtnLabelEl.className = 'lyt-visually-hidden';
|
||||
playBtnLabelEl.textContent = this.playLabel;
|
||||
playBtnEl.append(playBtnLabelEl);
|
||||
}
|
||||
playBtnEl.removeAttribute('href');
|
||||
|
||||
// On hover (or tap), warm up the TCP connections we're (likely) about to use.
|
||||
this.addEventListener('pointerover', LiteYTEmbed.warmConnections, {once: true});
|
||||
|
||||
// Once the user clicks, add the real iframe and drop our play button
|
||||
// TODO: In the future we could be like amp-youtube and silently swap in the iframe during idle time
|
||||
// We'd want to only do this for in-viewport or near-viewport ones: https://github.com/ampproject/amphtml/pull/5003
|
||||
this.addEventListener('click', this.addIframe);
|
||||
|
||||
// Chrome & Edge desktop have no problem with the basic YouTube Embed with ?autoplay=1
|
||||
// However Safari desktop and most/all mobile browsers do not successfully track the user gesture of clicking through the creation/loading of the iframe,
|
||||
// so they don't autoplay automatically. Instead we must load an additional 2 sequential JS files (1KB + 165KB) (un-br) for the YT Player API
|
||||
// TODO: Try loading the the YT API in parallel with our iframe and then attaching/playing it. #82
|
||||
this.needsYTApiForAutoplay = navigator.vendor.includes('Apple') || navigator.userAgent.includes('Mobi');
|
||||
}
|
||||
|
||||
/**
|
||||
* Add a <link rel={preload | preconnect} ...> to the head
|
||||
*/
|
||||
static addPrefetch(kind, url, as) {
|
||||
const linkEl = document.createElement('link');
|
||||
linkEl.rel = kind;
|
||||
linkEl.href = url;
|
||||
if (as) {
|
||||
linkEl.as = as;
|
||||
}
|
||||
document.head.append(linkEl);
|
||||
}
|
||||
|
||||
/**
|
||||
* Begin pre-connecting to warm up the iframe load
|
||||
* Since the embed's network requests load within its iframe,
|
||||
* preload/prefetch'ing them outside the iframe will only cause double-downloads.
|
||||
* So, the best we can do is warm up a few connections to origins that are in the critical path.
|
||||
*
|
||||
* Maybe `<link rel=preload as=document>` would work, but it's unsupported: http://crbug.com/593267
|
||||
* But TBH, I don't think it'll happen soon with Site Isolation and split caches adding serious complexity.
|
||||
*/
|
||||
static warmConnections() {
|
||||
if (LiteYTEmbed.preconnected) return;
|
||||
|
||||
// The iframe document and most of its subresources come right off youtube.com
|
||||
LiteYTEmbed.addPrefetch('preconnect', 'https://www.youtube-nocookie.com');
|
||||
// The botguard script is fetched off from google.com
|
||||
LiteYTEmbed.addPrefetch('preconnect', 'https://www.google.com');
|
||||
|
||||
// Not certain if these ad related domains are in the critical path. Could verify with domain-specific throttling.
|
||||
LiteYTEmbed.addPrefetch('preconnect', 'https://googleads.g.doubleclick.net');
|
||||
LiteYTEmbed.addPrefetch('preconnect', 'https://static.doubleclick.net');
|
||||
|
||||
LiteYTEmbed.preconnected = true;
|
||||
}
|
||||
|
||||
fetchYTPlayerApi() {
|
||||
if (window.YT || (window.YT && window.YT.Player)) return;
|
||||
|
||||
this.ytApiPromise = new Promise((res, rej) => {
|
||||
var el = document.createElement('script');
|
||||
el.src = 'https://www.youtube.com/iframe_api';
|
||||
el.async = true;
|
||||
el.onload = _ => {
|
||||
YT.ready(res);
|
||||
};
|
||||
el.onerror = rej;
|
||||
this.append(el);
|
||||
});
|
||||
}
|
||||
|
||||
async addYTPlayerIframe(params) {
|
||||
this.fetchYTPlayerApi();
|
||||
await this.ytApiPromise;
|
||||
|
||||
const videoPlaceholderEl = document.createElement('div')
|
||||
this.append(videoPlaceholderEl);
|
||||
|
||||
const paramsObj = Object.fromEntries(params.entries());
|
||||
|
||||
new YT.Player(videoPlaceholderEl, {
|
||||
width: '100%',
|
||||
videoId: this.videoId,
|
||||
playerVars: paramsObj,
|
||||
events: {
|
||||
'onReady': event => {
|
||||
event.target.playVideo();
|
||||
}
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
async addIframe(){
|
||||
if (this.classList.contains('lyt-activated')) return;
|
||||
this.classList.add('lyt-activated');
|
||||
|
||||
const params = new URLSearchParams(this.getAttribute('params') || []);
|
||||
params.append('autoplay', '1');
|
||||
params.append('playsinline', '1');
|
||||
|
||||
if (this.needsYTApiForAutoplay) {
|
||||
return this.addYTPlayerIframe(params);
|
||||
}
|
||||
|
||||
const iframeEl = document.createElement('iframe');
|
||||
iframeEl.width = 560;
|
||||
iframeEl.height = 315;
|
||||
// No encoding necessary as [title] is safe. https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html#:~:text=Safe%20HTML%20Attributes%20include
|
||||
iframeEl.title = this.playLabel;
|
||||
iframeEl.allow = 'accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture';
|
||||
iframeEl.allowFullscreen = true;
|
||||
// AFAIK, the encoding here isn't necessary for XSS, but we'll do it only because this is a URL
|
||||
// https://stackoverflow.com/q/64959723/89484
|
||||
iframeEl.src = `https://www.youtube-nocookie.com/embed/${encodeURIComponent(this.videoId)}?${params.toString()}`;
|
||||
this.append(iframeEl);
|
||||
|
||||
// Set focus for a11y
|
||||
iframeEl.focus();
|
||||
}
|
||||
}
|
||||
// Register custom element
|
||||
customElements.define('lite-youtube', LiteYTEmbed);
|
||||
@@ -0,0 +1,80 @@
|
||||
/*
|
||||
Put this file in /static/js/load-photoswipe.js
|
||||
Documentation and licence at https://github.com/liwenyip/hugo-easy-gallery/
|
||||
*/
|
||||
|
||||
/* Show an alert if this js file has been loaded twice */
|
||||
if (window.loadphotoswipejs) {
|
||||
window.alert("You've loaded load-photoswipe.js twice. See https://github.com/liwenyip/hugo-easy-gallery/issues/6")
|
||||
}
|
||||
var loadphotoswipejs = 1
|
||||
|
||||
/* TODO: Make the share function work */
|
||||
$( document ).ready(function() {
|
||||
/*
|
||||
Initialise Photoswipe
|
||||
*/
|
||||
var items = []; // array of slide objects that will be passed to PhotoSwipe()
|
||||
// for every figure element on the page:
|
||||
$('figure').each( function() {
|
||||
if ($(this).attr('class') == 'no-photoswipe') return true; // ignore any figures where class="no-photoswipe"
|
||||
// get properties from child a/img/figcaption elements,
|
||||
var $figure = $(this),
|
||||
$a = $figure.find('a'),
|
||||
$img = $figure.find('img'),
|
||||
$src = $a.attr('href'),
|
||||
$title = $img.attr('alt'),
|
||||
$msrc = $img.attr('src');
|
||||
// if data-size on <a> tag is set, read it and create an item
|
||||
if ($a.data('size')) {
|
||||
var $size = $a.data('size').split('x');
|
||||
var item = {
|
||||
src : $src,
|
||||
w : $size[0],
|
||||
h : $size[1],
|
||||
title : $title,
|
||||
msrc : $msrc
|
||||
};
|
||||
console.log("Using pre-defined dimensions for " + $src);
|
||||
// if not, set temp default size then load the image to check actual size
|
||||
} else {
|
||||
var item = {
|
||||
src : $src,
|
||||
w : 800, // temp default size
|
||||
h : 600, // temp default size
|
||||
title : $title,
|
||||
msrc : $msrc
|
||||
};
|
||||
console.log("Using default dimensions for " + $src);
|
||||
// load the image to check its dimensions
|
||||
// update the item as soon as w and h are known (check every 30ms)
|
||||
var img = new Image();
|
||||
img.src = $src;
|
||||
var wait = setInterval(function() {
|
||||
var w = img.naturalWidth,
|
||||
h = img.naturalHeight;
|
||||
if (w && h) {
|
||||
clearInterval(wait);
|
||||
item.w = w;
|
||||
item.h = h;
|
||||
console.log("Got actual dimensions for " + img.src);
|
||||
}
|
||||
}, 30);
|
||||
}
|
||||
// Save the index of this image then add it to the array
|
||||
var index = items.length;
|
||||
items.push(item);
|
||||
// Event handler for click on a figure
|
||||
$figure.on('click', function(event) {
|
||||
event.preventDefault(); // prevent the normal behaviour i.e. load the <a> hyperlink
|
||||
// Get the PSWP element and initialise it with the desired options
|
||||
var $pswp = $('.pswp')[0];
|
||||
var options = {
|
||||
index: index,
|
||||
bgOpacity: 0.8,
|
||||
showHideOpacity: true
|
||||
}
|
||||
new PhotoSwipe($pswp, PhotoSwipeUI_Default, items, options).init();
|
||||
});
|
||||
});
|
||||
});
|
||||
Reference in New Issue
Block a user