refactor: optimize LQIP loading
- add blur effect for external WebP format LQIP - remove the timeout delay
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2 changed files with 34 additions and 34 deletions
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@ -120,13 +120,13 @@
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{% endunless %}
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{% if _lqip %}
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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 _lazyload = false %}
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{% assign _class = _class | append: ' blur' %}
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{% unless _lqip contains 'data:' %}
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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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{% endif %}
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{% endunless %}
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<!-- add image placeholder -->
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{% assign _left = _left | replace: 'src=', 'data-src=' | replace: ' lqip=', ' data-lqip="true" src=' %}
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@ -4,27 +4,37 @@
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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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const cover = {
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SHIMMER: 'shimmer',
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BLUR: 'blur'
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};
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function removeCover(clzss) {
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$(this).parent().removeClass(clzss);
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}
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function handleImage() {
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const $img = $(this);
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if (!this.complete) {
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return;
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}
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if (this.hasAttribute(ATTR_DATA_LQIP) && this.complete) {
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$img.parent().removeClass(C_BLUR);
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if (this.hasAttribute(ATTR_DATA_LQIP)) {
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removeCover.call(this, cover.BLUR);
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} else {
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$img.parent().removeClass(C_SHIMMER);
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removeCover.call(this, cover.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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* Switches the LQIP with the real image URL.
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*/
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function switchLQIP() {
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const $img = $(this);
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const src = $img.attr(ATTR_DATA_SRC);
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$img.attr('src', encodeURI(src));
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$img.removeAttr(ATTR_DATA_SRC);
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}
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export function loadImg() {
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@ -34,28 +44,18 @@ export function loadImg() {
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$images.on('load', handleImage);
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}
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/* Images loaded from the browser cache do not trigger the 'load' event */
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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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removeCover.call(this, cover.SHIMMER);
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}
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});
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// LQIPs set by the data URI or WebP will not trigger the 'load' event,
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// so manually convert the URI to the URL of a high-resolution image.
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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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$lqips.each(switchLQIP);
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}
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}
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