🎨 Optimised infinite scroll (#503)
no issue - removed jQuery usage - use the `<link rel="next">` tag provided by Ghost to determine the next page to fetch
This commit is contained in:
汪磊
Kevin Ansfield
parent
f695d69aeb
commit
3c2347c7f9
4 changed files with 74 additions and 103 deletions
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@ -1,2 +1,2 @@
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$(function(t){var o=1,r=window.location.pathname,a=t(document),s=t(".post-feed"),c=300,l=!1,w=!1,d=window.scrollY,v=window.innerHeight,u=a.height();function f(){d=window.scrollY,e()}function g(){v=window.innerHeight,u=a.height(),e()}function e(){l||requestAnimationFrame(n),l=!0}function n(){var e,n;if(n=/(?:page\/)(\d)(?:\/)$/i,(e=(e=r).replace(/#(.*)$/g,"").replace("////g","/")).match(n)&&(o=parseInt(e.match(n)[1]),e=e.replace(n,"")),r=e,!w)if(d+v<=u-c)l=!1;else{if(o>=maxPages)return window.removeEventListener("scroll",f,{passive:!0}),void window.removeEventListener("resize",g);w=!0;var i=r+"page/"+(o+=1)+"/";t.get(i,function(e){var n=document.createRange().createContextualFragment(e).querySelectorAll(".post");n.length&&[].forEach.call(n,function(e){s[0].appendChild(e)})}).fail(function(e){404===e.status&&(window.removeEventListener("scroll",f,{passive:!0}),window.removeEventListener("resize",g))}).always(function(){u=a.height(),l=w=!1})}}window.addEventListener("scroll",f,{passive:!0}),window.addEventListener("resize",g),n()});
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!function(n,t){var r=t.querySelector("link[rel=next]");if(r){var i=t.querySelector(".post-feed");if(i){var o=300,s=!1,l=!1,c=n.scrollY,u=n.innerHeight,d=t.documentElement.scrollHeight;n.addEventListener("scroll",a,{passive:!0}),n.addEventListener("resize",m),f()}}function v(){if(404===this.status)return n.removeEventListener("scroll",a),void n.removeEventListener("resize",m);this.response.querySelectorAll(".post-card").forEach(function(e){i.appendChild(e)});var e=this.response.querySelector("link[rel=next]");e?r.href=e.href:(n.removeEventListener("scroll",a),n.removeEventListener("resize",m)),d=t.documentElement.scrollHeight,l=s=!1}function e(){if(!l)if(c+u<=d-o)s=!1;else{l=!0;var e=new n.XMLHttpRequest;e.responseType="document",e.addEventListener("load",v),e.open("GET",r.href),e.send(null)}}function f(){s||n.requestAnimationFrame(e),s=!0}function a(){c=n.scrollY,f()}function m(){u=n.innerHeight,d=t.documentElement.scrollHeight,f()}}(window,document);
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//# sourceMappingURL=infinitescroll.js.map
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File diff suppressed because one or more lines are too long
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@ -1,19 +1,78 @@
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/* global maxPages */
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/**
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* Infinite Scroll
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*/
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(function(window, document) {
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// next link element
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var nextElement = document.querySelector('link[rel=next]');
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if (!nextElement) return;
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// post feed element
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var feedElement = document.querySelector('.post-feed');
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if (!feedElement) return;
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// Code snippet inspired by https://github.com/douglasrodrigues5/ghost-blog-infinite-scroll
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$(function ($) {
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var currentPage = 1;
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var pathname = window.location.pathname;
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var $document = $(document);
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var $result = $('.post-feed');
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var buffer = 300;
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var ticking = false;
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var isLoading = false;
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var loading = false;
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var lastScrollY = window.scrollY;
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var lastWindowHeight = window.innerHeight;
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var lastDocumentHeight = $document.height();
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var lastDocumentHeight = document.documentElement.scrollHeight;
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function onPageLoad() {
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if (this.status === 404) {
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window.removeEventListener('scroll', onScroll);
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window.removeEventListener('resize', onResize);
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return;
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}
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// append contents
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var postElements = this.response.querySelectorAll('.post-card');
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postElements.forEach(function (item) {
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feedElement.appendChild(item);
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});
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// set next link
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var resNextElement = this.response.querySelector('link[rel=next]');
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if (resNextElement) {
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nextElement.href = resNextElement.href;
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} else {
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window.removeEventListener('scroll', onScroll);
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window.removeEventListener('resize', onResize);
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}
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// sync status
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lastDocumentHeight = document.documentElement.scrollHeight;
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ticking = false;
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loading = false;
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}
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function onUpdate() {
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// return if already loading
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if (loading) return;
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// return if not scroll to the bottom
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if (lastScrollY + lastWindowHeight <= lastDocumentHeight - buffer) {
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ticking = false;
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return;
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}
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loading = true;
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var xhr = new window.XMLHttpRequest();
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xhr.responseType = 'document';
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xhr.addEventListener('load', onPageLoad);
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xhr.open('GET', nextElement.href);
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xhr.send(null);
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}
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function requestTick() {
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ticking || window.requestAnimationFrame(onUpdate);
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ticking = true;
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}
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function onScroll() {
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lastScrollY = window.scrollY;
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@ -22,94 +81,12 @@ $(function ($) {
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function onResize() {
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lastWindowHeight = window.innerHeight;
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lastDocumentHeight = $document.height();
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lastDocumentHeight = document.documentElement.scrollHeight;
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requestTick();
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}
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function requestTick() {
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if (!ticking) {
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requestAnimationFrame(infiniteScroll);
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}
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ticking = true;
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}
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function sanitizePathname(path) {
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var paginationRegex = /(?:page\/)(\d)(?:\/)$/i;
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// remove hash params from path
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path = path.replace(/#(.*)$/g, '').replace('////g', '/');
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// remove pagination from the path and replace the current pages
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// with the actual requested page. E. g. `/page/3/` indicates that
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// the user actually requested page 3, so we should request page 4
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// next, unless it's the last page already.
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if (path.match(paginationRegex)) {
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currentPage = parseInt(path.match(paginationRegex)[1]);
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path = path.replace(paginationRegex, '');
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}
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return path;
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}
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function infiniteScroll() {
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// sanitize the pathname from possible pagination or hash params
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pathname = sanitizePathname(pathname);
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// return if already loading
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if (isLoading) {
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return;
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}
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// return if not scroll to the bottom
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if (lastScrollY + lastWindowHeight <= lastDocumentHeight - buffer) {
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ticking = false;
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return;
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}
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/**
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* maxPages is defined in default.hbs and is the value
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* of the amount of pagination pages.
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* If we reached the last page or are past it,
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* we return and disable the listeners.
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*/
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if (currentPage >= maxPages) {
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window.removeEventListener('scroll', onScroll, {passive: true});
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window.removeEventListener('resize', onResize);
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return;
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}
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isLoading = true;
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// next page
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currentPage += 1;
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// Load more
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var nextPage = pathname + 'page/' + currentPage + '/';
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$.get(nextPage, function (content) {
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var parse = document.createRange().createContextualFragment(content);
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var posts = parse.querySelectorAll('.post');
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if (posts.length) {
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[].forEach.call(posts, function (post) {
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$result[0].appendChild(post);
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});
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}
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}).fail(function (xhr) {
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// 404 indicates we've run out of pages
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if (xhr.status === 404) {
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window.removeEventListener('scroll', onScroll, {passive: true});
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window.removeEventListener('resize', onResize);
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}
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}).always(function () {
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lastDocumentHeight = $document.height();
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isLoading = false;
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ticking = false;
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});
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}
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window.addEventListener('scroll', onScroll, { passive: true });
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window.addEventListener('resize', onResize);
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infiniteScroll();
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});
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requestTick();
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})(window, document);
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@ -76,12 +76,6 @@
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<script type="text/javascript" src="{{asset "built/jquery.fitvids.js"}}"></script>
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{{#if pagination.pages}}
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<script>
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// maxPages is a global variable that is needed to determine
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// if we need to load more pages for the infinitescroll, or if
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// we reached the last page already.
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var maxPages = parseInt('{{pagination.pages}}');
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</script>
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<script src="{{asset "built/infinitescroll.js"}}"></script>
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{{/if}}
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