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. * * The individual post items are extracted from the fetched pages by looking for * a wrapper element with the class "post-card". Any found elements are appended * to the element with the class "post-feed" in the currently viewed page. */ (function (window, document) { // next link element var nextElement = document.querySelector('link[rel=next]'); if (!nextElement) { return; } // post feed element var feedElement = document.querySelector('.post-feed'); if (!feedElement) { return; } var buffer = 300; var ticking = false; var loading = false; var lastScrollY = window.scrollY; var lastWindowHeight = window.innerHeight; var lastDocumentHeight = document.documentElement.scrollHeight; function onPageLoad() { if (this.status === 404) { window.removeEventListener('scroll', onScroll); window.removeEventListener('resize', onResize); return; } // append contents var postElements = this.response.querySelectorAll('article.post-card'); postElements.forEach(function (item) { // document.importNode is important, without it the item's owner // document will be different which can break resizing of // `object-fit: cover` images in Safari feedElement.appendChild(document.importNode(item, true)); }); // set next link var resNextElement = this.response.querySelector('link[rel=next]'); if (resNextElement) { nextElement.href = resNextElement.href; } else { window.removeEventListener('scroll', onScroll); window.removeEventListener('resize', onResize); } // sync status lastDocumentHeight = document.documentElement.scrollHeight; ticking = false; loading = false; } function onUpdate() { // return if already loading if (loading) { return; } // return if not scroll to the bottom if (lastScrollY + lastWindowHeight <= lastDocumentHeight - buffer) { ticking = false; return; } loading = true; var xhr = new window.XMLHttpRequest(); xhr.responseType = 'document'; xhr.addEventListener('load', onPageLoad); xhr.open('GET', nextElement.href); xhr.send(null); } function requestTick() { ticking || window.requestAnimationFrame(onUpdate); ticking = true; } function onScroll() { lastScrollY = window.scrollY; requestTick(); } function onResize() { lastWindowHeight = window.innerHeight; lastDocumentHeight = document.documentElement.scrollHeight; requestTick(); } window.addEventListener('scroll', onScroll, {passive: true}); window.addEventListener('resize', onResize); requestTick(); })(window, document);