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lqs469/feed.html

Last active March 11, 2021 17:16
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feed.html
Raw
feed.html
<!DOCTYPE html>
<style>
body {
margin: 0;
}
iframe {
display: block;
overflow: hidden;
margin: 0 auto;
border: 0;
width: 100%;
max-width: 500px;
background: #ccc;
border-bottom: solid 1px #fff;
}
</style>
<body>
<!-- <img class="post_media_photo image post-media-photo-embedded animated" alt="" width="202" height="281"
src="https://64.media.tumblr.com/a465db7c482ef0330f5c30f19925677a/tumblr_pkci81gQFH1uw2127o1_250.gifv"
data-full-src="https://64.media.tumblr.com/a465db7c482ef0330f5c30f19925677a/tumblr_pkci81gQFH1uw2127o1_250.gifv"
data-pin-url="https://tokisrolis.tumblr.com/post/181427403251"
data-pin-description="+18 only,funny pics and gifs"> -->
<div id="root"></div>
<script>
const resourceList = [
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"https://embed.tumblr.com/embed/post/3SJqH8-WMY4E-hkMX0Ooag/173647517536",
"https://embed.tumblr.com/embed/post/3SJqH8-WMY4E-hkMX0Ooag/170531621651",
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];
const root = document.getElementById('root');
const itemHeightPercent = 0.3;
const itemHeight = innerHeight * itemHeightPercent;
const initailCount = Math.ceil(1 / itemHeightPercent);
const renderThreshold = 20;
let count = 0;
const renderedElements = [];
const renderImg = (index) => {
if (!resourceList[index]) {
return;
}
const iframe = document.createElement('iframe');
iframe.style.height = `${itemHeightPercent * 100}vh`;
iframe.src = resourceList[index];
root.appendChild(iframe);
renderedElements.push(iframe);
}
for (; count < initailCount; count++) {
renderImg(count);
}
const scrollDebouncedFn = debounce(() => {
if (scrollY + innerHeight + renderThreshold >= document.body.scrollHeight) {
count++;
renderImg(count);
}
const elementsInViewport = [];
for (let i = 0; i < renderedElements.length; i++) {
if (isInViewport(renderedElements[i])) {
elementsInViewport.push(renderedElements[i]);
};
}
console.log(elementsInViewport);
}, 50);
document.addEventListener('scroll', scrollDebouncedFn);
function isInViewport(element) {
const rect = element.getBoundingClientRect();
return (
rect.top >= 0 &&
rect.left >= 0 &&
rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
rect.right <= (window.innerWidth || document.documentElement.clientWidth)
);
}
function debounce(func, wait, immediate) {
var timeout;
return function () {
const context = this;
const args = arguments;
const later = function () {
timeout = null;
if (!immediate) func.apply(context, args);
};
const callNow = immediate && !timeout;
clearTimeout(timeout);
timeout = setTimeout(later, wait);
if (callNow) func.apply(context, args);
};
};
</script>
</body>
</html>
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