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$$plugins.define('lazyload', function (element, options) {
const plugin = this;
plugin.logger.debug("lazy loading");
const mutationObserver =
new MutationObserver(function (mutations) {
mutations.forEach(function (mutation, index) {
if (mutation.type === 'childList') {
mutation.addedNodes.forEach(update);
}
});
}),
observer =
new IntersectionObserver(function (entries, self) {
entries.forEach(function (entry) {
if (entry.isIntersecting) {
load(entry.target);
self.unobserve(entry.target);
}
});
}, options || {
rootMargin: '0px 0px 1250px 0px',
threshold: 0
}),
elms = element.querySelectorAll('.lazy');
elms.forEach(elm => observer.observe(elm));
mutationObserver.observe(element, { childList: true, subtree: true });
function update(element) {
if (!(element instanceof (HTMLElement))) {
return;
}
const container = element || document;
if (!container.querySelectorAll) {
return;
}
const elms = container.querySelectorAll('.lazy');
Array.prototype.forEach.call(elms, (elm) => !elm.getAttribute('data-loaded') && observer.observe(elm));
}
function load(elm) {
let i = 0, source, attr, picture = elm.parentElement, sources = picture.querySelectorAll('.lazysrcset');
if (sources.length) {
for (; i < sources.length; i++) {
source = sources[i];
attr = source.getAttribute('data-srcset');
if (attr) {
source.srcset = source.getAttribute('data-srcset');
}
}
}
if (!elm.getAttribute('data-loaded') && elm.getAttribute('data-src')) {
elm.src = elm.getAttribute('data-src');
elm.setAttribute('data-loaded', true);
}
}
return {
update: update
};
});
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