64 lines
2.3 KiB
JavaScript
64 lines
2.3 KiB
JavaScript
class LiteYTEmbed extends HTMLElement {
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connectedCallback() {
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this.videoId = this.getAttribute('videoid');
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let playBtnEl = this.querySelector('.lty-playbtn');
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this.playLabel = (playBtnEl && playBtnEl.textContent.trim()) || this.getAttribute('playlabel') || 'Play';
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if (!this.style.backgroundImage) {
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this.style.backgroundImage = `url("https://i.ytimg.com/vi/${this.videoId}/hqdefault.jpg")`;
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}
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if (!playBtnEl) {
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playBtnEl = document.createElement('button');
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playBtnEl.type = 'button';
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playBtnEl.classList.add('lty-playbtn');
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this.append(playBtnEl);
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}
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if (!playBtnEl.textContent) {
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const playBtnLabelEl = document.createElement('span');
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playBtnLabelEl.className = 'lyt-visually-hidden';
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playBtnLabelEl.textContent = this.playLabel;
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playBtnEl.append(playBtnLabelEl);
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}
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this.addEventListener('pointerover', LiteYTEmbed.warmConnections, {once: true});
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this.addEventListener('click', this.addIframe);
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}
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static addPrefetch(kind, url, as) {
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const linkEl = document.createElement('link');
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linkEl.rel = kind;
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linkEl.href = url;
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if (as) {
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linkEl.as = as;
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}
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document.head.append(linkEl);
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}
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static warmConnections() {
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if (LiteYTEmbed.preconnected) return;
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LiteYTEmbed.addPrefetch('preconnect', 'https://www.youtube-nocookie.com');
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LiteYTEmbed.addPrefetch('preconnect', 'https://www.google.com');
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LiteYTEmbed.addPrefetch('preconnect', 'https://googleads.g.doubleclick.net');
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LiteYTEmbed.addPrefetch('preconnect', 'https://static.doubleclick.net');
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LiteYTEmbed.preconnected = true;
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}
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addIframe() {
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if (this.classList.contains('lyt-activated')) return;
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this.classList.add('lyt-activated');
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const params = new URLSearchParams(this.getAttribute('params') || []);
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params.append('autoplay', '1');
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const iframeEl = document.createElement('iframe');
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iframeEl.width = 560;
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iframeEl.height = 315;
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iframeEl.sandbox = 'allow-scripts allow-same-origin allow-popups';
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iframeEl.title = this.playLabel;
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iframeEl.allow = 'accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture';
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iframeEl.allowFullscreen = true;
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iframeEl.src = `https://www.youtube-nocookie.com/embed/${encodeURIComponent(this.videoId)}?${params.toString()}`;
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this.append(iframeEl);
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iframeEl.focus();
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}
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}
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customElements.define('lite-youtube', LiteYTEmbed); |