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function rocket_css_lazyload_launch() {
const usable_pairs = typeof rocket_pairs === 'undefined' ? [] : rocket_pairs;
const styleElement = document.querySelector('#wpr-lazyload-bg');
const threshold = rocket_lazyload_css_data.threshold || 300;
const observer = new IntersectionObserver(entries => {
entries.forEach(entry => {
if (entry.isIntersecting) {
const pairs = usable_pairs.filter(s => entry.target.matches(s.selector));
pairs.map(pair => {
if (pair) {
styleElement.innerHTML += pair.style;
pair.elements.forEach(el => {
el.setAttribute('data-rocket-lazy-bg', 'loaded');
// Stop observing the target element
observer.unobserve(el);
});
}
})
}
});
}, {
rootMargin: threshold + 'px'
});
function lazyload(e = []) {
const pass = e.length === 0 || e.find(e => e.type !== 'attributes' || e.attributeName === 'class');
if(! pass ) {
return;
}
usable_pairs.forEach(pair => {
try {
const elements = document.querySelectorAll(pair.selector);
elements.forEach(el => {
if(el.getAttribute('data-rocket-lazy-bg') === 'loaded') {
return;
}
observer.observe(el);
// Save el in the pair object (create a new empty array if it doesn't exist)
(pair.elements ||= []).push(el);
});
} catch (error) {
console.error(error);
}
});
}
lazyload();
const observe_DOM = (function(){
const MutationObserver = window.MutationObserver;
return function( obj, callback ){
if( !obj || obj.nodeType !== 1 ) return;
// define a new observer
const mutationObserver = new MutationObserver(callback);
// have the observer observe for changes in children
mutationObserver.observe( obj, { attributes: true, childList:true, subtree:true })
return mutationObserver
}
})()
const body = document.querySelector('body');
observe_DOM(body, lazyload)
}
rocket_css_lazyload_launch();