jQuery load more data on scroll

Question

I am just wondering how can i implement more data on scroll only if the div.loading is visible.

Usually we look for page height and scroll height, to see if we need

Answer 1

If not all of your document scrolls, say, when you have a scrolling div within the document, then the above solutions won't work without adaptations. Here's how to check whether the div's scrollbar has hit the bottom:

$('#someScrollingDiv').on('scroll', function() {
    let div = $(this).get(0);
    if(div.scrollTop + div.clientHeight >= div.scrollHeight) {
        // do the lazy loading here
    }
});