🎨 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 2018-12-05 20:38:11 +08:00 committed by Kevin Ansfield
parent f695d69aeb
commit 3c2347c7f9
4 changed files with 74 additions and 103 deletions

View File

@ -1,2 +1,2 @@
$(function(t){var o=1,r=window.location.pathname,a=t(document),s=t(".post-feed"),c=300,l=!1,w=!1,d=window.scrollY,v=window.innerHeight,u=a.height();function f(){d=window.scrollY,e()}function g(){v=window.innerHeight,u=a.height(),e()}function e(){l||requestAnimationFrame(n),l=!0}function n(){var e,n;if(n=/(?:page\/)(\d)(?:\/)$/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()}); !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);
//# sourceMappingURL=infinitescroll.js.map //# sourceMappingURL=infinitescroll.js.map

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@ -1,19 +1,78 @@
/* global maxPages */ /**
* 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;
// 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');
var buffer = 300; var buffer = 300;
var ticking = false; var ticking = false;
var isLoading = false; var loading = false;
var lastScrollY = window.scrollY; var lastScrollY = window.scrollY;
var lastWindowHeight = window.innerHeight; var lastWindowHeight = window.innerHeight;
var lastDocumentHeight = $document.height(); 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('.post-card');
postElements.forEach(function (item) {
feedElement.appendChild(item);
});
// 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() { function onScroll() {
lastScrollY = window.scrollY; lastScrollY = window.scrollY;
@ -22,94 +81,12 @@ $(function ($) {
function onResize() { function onResize() {
lastWindowHeight = window.innerHeight; lastWindowHeight = window.innerHeight;
lastDocumentHeight = $document.height(); lastDocumentHeight = document.documentElement.scrollHeight;
requestTick(); requestTick();
} }
function requestTick() {
if (!ticking) {
requestAnimationFrame(infiniteScroll);
}
ticking = true;
}
function sanitizePathname(path) {
var paginationRegex = /(?:page\/)(\d)(?:\/)$/i;
// remove hash params from path
path = path.replace(/#(.*)$/g, '').replace('////g', '/');
// 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]);
path = path.replace(paginationRegex, '');
}
return path;
}
function infiniteScroll() {
// sanitize the pathname from possible pagination or hash params
pathname = sanitizePathname(pathname);
// return if already loading
if (isLoading) {
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;
}
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;
});
}
window.addEventListener('scroll', onScroll, { passive: true }); window.addEventListener('scroll', onScroll, { passive: true });
window.addEventListener('resize', onResize); window.addEventListener('resize', onResize);
infiniteScroll(); requestTick();
}); })(window, document);

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@ -76,12 +76,6 @@
<script type="text/javascript" src="{{asset "built/jquery.fitvids.js"}}"></script> <script type="text/javascript" src="{{asset "built/jquery.fitvids.js"}}"></script>
{{#if pagination.pages}} {{#if pagination.pages}}
<script>
// maxPages is a global variable that is needed to determine
// if we need to load more pages for the infinitescroll, or if
// we reached the last page already.
var maxPages = parseInt('{{pagination.pages}}');
</script>
<script src="{{asset "built/infinitescroll.js"}}"></script> <script src="{{asset "built/infinitescroll.js"}}"></script>
{{/if}} {{/if}}