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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,115 +1,92 @@ | ||
| /* global maxPages */ | ||
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| // Code snippet inspired by https://github.com/douglasrodrigues5/ghost-blog-infinite-scroll | ||
| $(function ($) { | ||
| var currentPage = 1; | ||
| var pathname = window.location.pathname; | ||
| var $document = $(document); | ||
| var $result = $('.post-feed'); | ||
| /** | ||
| * Infinite Scroll | ||
| */ | ||
|
|
||
| (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; | ||
|
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| var buffer = 300; | ||
|
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| var ticking = false; | ||
| var isLoading = false; | ||
| var loading = false; | ||
|
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| var lastScrollY = window.scrollY; | ||
| var lastWindowHeight = window.innerHeight; | ||
| var lastDocumentHeight = $document.height(); | ||
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| function onScroll() { | ||
| lastScrollY = window.scrollY; | ||
| requestTick(); | ||
| } | ||
| var lastDocumentHeight = document.documentElement.scrollHeight; | ||
|
|
||
| function onResize() { | ||
| lastWindowHeight = window.innerHeight; | ||
| lastDocumentHeight = $document.height(); | ||
| requestTick(); | ||
| } | ||
|
|
||
| function requestTick() { | ||
| if (!ticking) { | ||
| requestAnimationFrame(infiniteScroll); | ||
| function onPageLoad() { | ||
| if (this.status === 404) { | ||
| window.removeEventListener('scroll', onScroll); | ||
| window.removeEventListener('resize', onResize); | ||
| return; | ||
| } | ||
| ticking = true; | ||
| } | ||
|
|
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| function sanitizePathname(path) { | ||
| var paginationRegex = /(?:page\/)(\d)(?:\/)$/i; | ||
|
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| // remove hash params from path | ||
| path = path.replace(/#(.*)$/g, '').replace('////g', '/'); | ||
|
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| // remove pagination from the path and replace the current pages | ||
| // with the actual requested page. E. g. `/page/3/` indicates that | ||
| // the user actually requested page 3, so we should request page 4 | ||
| // next, unless it's the last page already. | ||
| if (path.match(paginationRegex)) { | ||
| currentPage = parseInt(path.match(paginationRegex)[1]); | ||
| // append contents | ||
| var postElements = this.response.querySelectorAll('.post-card'); | ||
| postElements.forEach(function (item) { | ||
| feedElement.appendChild(item); | ||
| }); | ||
|
|
||
| path = path.replace(paginationRegex, ''); | ||
| // 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); | ||
| } | ||
|
|
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| return path; | ||
| // sync status | ||
| lastDocumentHeight = document.documentElement.scrollHeight; | ||
| ticking = false; | ||
| loading = false; | ||
| } | ||
|
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||
| function infiniteScroll() { | ||
| // sanitize the pathname from possible pagination or hash params | ||
| pathname = sanitizePathname(pathname); | ||
|
|
||
| function onUpdate() { | ||
| // return if already loading | ||
| if (isLoading) { | ||
| return; | ||
| } | ||
| if (loading) return; | ||
|
|
||
| // return if not scroll to the bottom | ||
| if (lastScrollY + lastWindowHeight <= lastDocumentHeight - buffer) { | ||
| ticking = false; | ||
| return; | ||
| } | ||
|
|
||
| /** | ||
| * maxPages is defined in default.hbs and is the value | ||
| * of the amount of pagination pages. | ||
| * If we reached the last page or are past it, | ||
| * we return and disable the listeners. | ||
| */ | ||
| if (currentPage >= maxPages) { | ||
| window.removeEventListener('scroll', onScroll, {passive: true}); | ||
| window.removeEventListener('resize', onResize); | ||
| return; | ||
| } | ||
| loading = true; | ||
|
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| isLoading = true; | ||
|
|
||
| // next page | ||
| currentPage += 1; | ||
|
|
||
| // Load more | ||
| var nextPage = pathname + 'page/' + currentPage + '/'; | ||
|
|
||
| $.get(nextPage, function (content) { | ||
| var parse = document.createRange().createContextualFragment(content); | ||
| var posts = parse.querySelectorAll('.post'); | ||
| if (posts.length) { | ||
| [].forEach.call(posts, function (post) { | ||
| $result[0].appendChild(post); | ||
| }); | ||
| } | ||
| }).fail(function (xhr) { | ||
| // 404 indicates we've run out of pages | ||
| if (xhr.status === 404) { | ||
| window.removeEventListener('scroll', onScroll, {passive: true}); | ||
| window.removeEventListener('resize', onResize); | ||
| } | ||
| }).always(function () { | ||
| lastDocumentHeight = $document.height(); | ||
| isLoading = false; | ||
| ticking = false; | ||
| }); | ||
| var xhr = new window.XMLHttpRequest(); | ||
| xhr.responseType = 'document'; | ||
|
|
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| xhr.addEventListener('load', onPageLoad); | ||
|
|
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| xhr.open('GET', nextElement.href); | ||
| xhr.send(null); | ||
| } | ||
|
|
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| 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('scroll', onScroll, { passive: true }); | ||
| window.addEventListener('resize', onResize); | ||
|
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| infiniteScroll(); | ||
| }); | ||
| requestTick(); | ||
| })(window, document); |
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