I'm creating a messaging feature. The conversation occupies only 100vh height minus the header - so, I have to make its overflow set to scroll. How do I detect if the user scrolls to the topmost part of the conversation? I will fetch older messages once the user scrolls to the top.
I did some research but none of them are working. I think they're only applicable for a scrollable page.
The code snippet below is similar to what I am seeing over the web. However, the scroll never gets triggered.
const top_ref = React.useRef < HTMLDivElement > null;
const trackScrolling = () => {
console.log("scrolling");
};
React.useEffect(() => {
document.addEventListener("scroll", trackScrolling);
return () => {
document.removeEventListener("scroll", trackScrolling);
};
});
As pointed out by cloned , Intersection Observer does the job.
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