web/_javascript/utils/img-extra.js

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/**
Lazy load images (https://github.com/ApoorvSaxena/lozad.js)
and popup when clicked (https://github.com/dimsemenov/Magnific-Popup)
*/
$(function() {
const IMG_SCOPE = '#main > div.row:first-child > div:first-child';
if ($(`${IMG_SCOPE} img`).length <= 0 ) {
return;
}
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/* lazy loading */
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const imgList = document.querySelectorAll(`${IMG_SCOPE} img[data-src]`);
const observer = lozad(imgList);
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observer.observe();
/* popup */
$(`${IMG_SCOPE} p > img[data-src],${IMG_SCOPE} img[data-src].preview-img`).each(
function() {
let nextTag = $(this).next();
const title = nextTag.prop('tagName') === 'EM' ? nextTag.text() : '';
const src = $(this).attr('data-src'); // created by lozad.js
$(this).wrap(`<a href="${src}" title="${title}" class="popup"></a>`);
}
);
$('.popup').magnificPopup({
type: 'image',
closeOnContentClick: true,
showCloseBtn: false,
zoom: {
enabled: true,
duration: 300,
easing: 'ease-in-out'
}
});
/* markup the image links */
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$(`${IMG_SCOPE} a`).has("img").addClass('img-link');
});