refactor(core): optimize image loading
- JavaScript runs so fast that LQIP will never be detected - Increase the running priority of image processing in posts Enhancement for #1267
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4 changed files with 56 additions and 24 deletions
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@ -81,6 +81,7 @@
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{% assign _left = _left | remove: ' /' | replace: ' w=', ' width=' | replace: ' h=', ' height=' %}
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{% assign _attrs = _left | split: '" ' %}
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{% assign _src = null %}
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{% assign _lqip = null %}
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{% assign _class = null %}
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@ -119,8 +120,9 @@
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{% endunless %}
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{% if _lqip %}
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{% if _lqip contains ':' %}
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{% if _lqip contains 'data:' %}
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{% assign _lazyload = false %}
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{% assign _class = _class | append: ' blur' %}
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{% else %}
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{% assign _lqip_alt = 'lqip="' | append: _path_prefix %}
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{% assign _left = _left | replace: 'lqip="', _lqip_alt %}
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@ -2,30 +2,60 @@
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* Setting up image lazy loading and LQIP switching
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*/
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const ATTR_DATA_SRC = 'data-src';
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const ATTR_DATA_LQIP = 'data-lqip';
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const C_SHIMMER = 'shimmer';
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const C_BLUR = 'blur';
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function handleImage() {
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const $img = $(this);
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if (this.hasAttribute(ATTR_DATA_LQIP) && this.complete) {
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$img.parent().removeClass(C_BLUR);
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} else {
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$img.parent().removeClass(C_SHIMMER);
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}
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}
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/* Switch LQIP with real image url */
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function switchLQIP(img) {
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// Sometimes loaded from cache without 'data-src'
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if (img.hasAttribute(ATTR_DATA_SRC)) {
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const $img = $(img);
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const dataSrc = $img.attr(ATTR_DATA_SRC);
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$img.attr('src', encodeURI(dataSrc));
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}
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}
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export function loadImg() {
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const $images = $('main img[loading="lazy"]');
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const $lqip = $('main img[data-lqip="true"]');
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const $images = $('article img');
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if ($images.length > 0) {
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$images.on('load', function () {
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/* Stop shimmer when image loaded */
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$(this).parent().removeClass('shimmer');
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});
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if ($images.length) {
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$images.on('load', handleImage);
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}
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$images.each(function () {
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/* Images loaded from the browser cache do not trigger the 'load' event */
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if ($(this).prop('complete')) {
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$(this).parent().removeClass('shimmer');
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/* Images loaded from the browser cache do not trigger the 'load' event */
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$('article img[loading="lazy"]').each(function () {
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if (this.complete) {
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$(this).parent().removeClass(C_SHIMMER);
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}
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});
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const $lqips = $(`article img[${ATTR_DATA_LQIP}="true"]`);
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if ($lqips.length) {
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const isHome = $('#post-list').length > 0;
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$lqips.each(function () {
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if (isHome) {
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// JavaScript runs so fast that LQIPs in home page will never be detected
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// Delay 50ms to ensure LQIPs visibility
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setTimeout(() => {
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switchLQIP(this);
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}, 50);
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} else {
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switchLQIP(this);
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}
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});
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}
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if ($lqip.length > 0) {
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$lqip.each(function () {
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/* Switch LQIP with real image url */
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const dataSrc = $(this).attr('data-src');
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$(this).attr('src', encodeURI(dataSrc));
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$(this).removeAttr('data-src data-lqip');
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});
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}
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}
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@ -7,7 +7,6 @@ import {
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toc
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} from './modules/plugins';
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basic();
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initSidebar();
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initTopbar();
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loadImg();
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@ -15,3 +14,4 @@ imgPopup();
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initLocaleDatetime();
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initClipboard();
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toc();
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basic();
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@ -71,9 +71,9 @@ a {
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img {
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max-width: 100%;
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height: auto;
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transition: all 0.7s ease-in-out;
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transition: all 0.35s ease-in-out;
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&[data-lqip='true'] {
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.blur & {
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$blur: 20px;
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-webkit-filter: blur($blur);
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