Basic Infinite Scroll Implementation
Demonstrate a basic setup of infinite scroll using TanStack Virtual with a list of items, including setting up the virtualizer and rendering items on the screen as they become visible.
import { useRef } from 'react';
import { useVirtualizer } from '@tanstack/react-virtual';
Imports the necessary hooks from React and the useVirtualizer function from TanStack Virtual.
const parentRef = useRef();
Creates a ref for the scrolling container.
const fetchData = async () => {/* Function to fetch your data */};
Defines a placeholder function to fetch more data. Replace this with your actual data fetching logic.
const { virtualItems, scrollToIndex } = useVirtualizer({
count: infiniteData.length,
getScrollElement: () => parentRef.current,
estimateSize: () => 35,
overscan: 10,
onScroll: ({ scrollOffset, scrollDirection }) => {
if (scrollOffset + windowHeight > totalScrollHeight - threshold) {
fetchData();
}
}
});
Sets up the virtualizer with a count of items, a function to get the scrolling element, an estimate size for each item, an overscan amount for pre-loading items, and an onScroll function to fetch more data as the user scrolls near the bottom.
return (
<div ref={parentRef} style={{ height: '100vh', overflow: 'auto' }}>
{virtualItems.map(virtualItem => (
<div
key={virtualItem.index}
style={{
position: 'absolute',
top: 0,
left: 0,
width: '100%',
transform: `translateY(${virtualItem.start}px)`,
height: `${virtualItem.size}px`
}}
>
{`Item ${virtualItem.index}`}
</div>
))}
</div>
);
Renders the virtual items using the properties provided by the virtualizer, positioning each item according to its calculated start position.