Возникла проблема со стилями
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+15
@@ -0,0 +1,15 @@
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.container {
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/* display: flex;
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flex-direction: column;
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flex-wrap: nowrap;*/
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height: 500px;
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overflow: auto;
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border: 1px solid black;
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}
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.item {
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font-size: 16pt;
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border: 1px dotted gray;
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/*margin: 5px 10px;
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padding: 10px;*/
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border-radius: 5px;
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}
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+31
-41
@@ -1,45 +1,33 @@
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import { useState, useRef } from 'react'
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import './App.scss'
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import { useEffect, useRef, useState } from 'react';
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import styles from './App.css';
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function VirtualList({ items, itemHeight=50, containerHeight=400 }) {
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const containerRef = useRef(null)
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//Положение большого нивидимого контейнера
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const [scrollTop,setScrollTop] = useState(0);
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//Количество отображаемых элементов
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const visibleCount = Math.ceil(containerHeight / itemHeight);
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//Общая высота нивидимого контейнера
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const totalHeight = items.length * itemHeight;
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//Начало и конец подгружаемых(отображаемых) элементов
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const startIndex = Math.floor(scrollTop / itemHeight);
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const endIndex = Math.min(startIndex + visibleCount + 1, items.length);
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//Срез видимых элементов из общего списка
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const visibleItems = items.slice(startIndex,endIndex);
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const handleScroll = e => {
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setScrollTop(e.target.scrollTop);
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console.log(e.target.scrollTop)
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}
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return (
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<div ref={containerRef} className="container" style={{
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height: containerHeight
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}} onScroll={handleScroll}>
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<div style={{ height:totalHeight }}>
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<div style={{position:'relative', left:0, right: 0}}>
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{visibleItems.map(item => (
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<div className="item" key={item.id} style={{ height: itemHeight }}>
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{item.name}
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</div>
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))}
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</div>
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</div>
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</div>
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)
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}
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/*
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const InfiniteList = () => {
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const [items, setItems] = useState([...Array(20).keys()]); // Initial data
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const loaderRef = useRef(null);
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const loadMore = () => {
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setItems((prev) => [...prev, ...Array(10).keys()].map((_, i) => prev.length + i));
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};
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useEffect(() => {
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const observer = new IntersectionObserver((entries) => {
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if (entries[0].isIntersecting) {
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loadMore(); // Load next batch when the loader is seen
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}
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});
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if (loaderRef.current) observer.observe(loaderRef.current);
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return () => observer.disconnect();
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}, []);
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return (
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<ul>
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{items.map(item => <li key={item} className={ styles.item }>Item {item}</li>)}
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<div ref={loaderRef}>Loading more...</div>
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</ul>
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);
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};
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*/
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function App() {
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const generatedBigDataSet = () => {
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return Array.from({ length: 100 }, (_, index) => ({
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@@ -54,7 +42,9 @@ function App() {
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<>
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<div>
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<h2>Визуализация большого списка</h2>
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<VirtualList items={data} itemHeight={60} containerHeight={500} />
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<div className={ styles.container }>
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<InfiniteList />
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</div>
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</div>
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</>
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)
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@@ -2,6 +2,7 @@
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/* display: flex;
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flex-direction: column;
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flex-wrap: nowrap;*/
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height: 500px;
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overflow: auto;
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border: 1px solid black;
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}
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