263 lines
8.5 KiB
HTML
263 lines
8.5 KiB
HTML
<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>动态获取图片尺寸的瀑布流</title>
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<style>
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* {
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margin: 0;
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padding: 0;
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box-sizing: border-box;
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}
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body {
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font-family: Arial, sans-serif;
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padding: 20px;
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background-color: #f5f5f5;
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}
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.waterfall-container {
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position: relative;
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margin: 0 auto;
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min-height: 100vh;
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}
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.waterfall-item {
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position: absolute;
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width: calc(100% / var(--columns, 4) - 10px);
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margin: 5px;
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transition: all 0.3s ease;
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background-color: #fff;
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border-radius: 8px;
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overflow: hidden;
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box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
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opacity: 0;
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animation: fadeIn 0.5s forwards;
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}
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@keyframes fadeIn {
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to {
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opacity: 1;
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}
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}
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.waterfall-item img {
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width: 100%;
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display: block;
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transition: opacity 0.3s ease;
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}
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.waterfall-item .img-placeholder {
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width: 100%;
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background-color: #eee;
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display: flex;
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align-items: center;
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justify-content: center;
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color: #999;
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}
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.waterfall-item .content {
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padding: 10px;
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}
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.loading {
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text-align: center;
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padding: 20px;
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font-size: 18px;
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color: #666;
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}
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img {
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transition: all 0.5s;
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}
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img:hover {
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transform: scale(1.1);
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/*图片放大1.1倍*/
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margin-top: 30px;
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/*鼠标悬停时上移30px*/
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/* margin-top: 0px;和hover的margin-top有对比，原无30,现在0，相当于上移了,30px */
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box-shadow: 0 0 20px 2px #918f8f;
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/*盒子阴影*/
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transition: all 0.5s;
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/*持续时间*/
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}
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</style>
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</head>
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<body>
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<div class="waterfall-container" id="waterfall">
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<div class="loading">加载中，请稍候...</div>
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<!-- 示例结构 - 实际使用时可以动态生成 -->
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{% for img in imgs %}
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<div class="waterfall-item">
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<div class="img-placeholder">
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<img data-src={{img.path}}>
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</div>
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</div>
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{% endfor %}
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</div>
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<script>
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document.addEventListener('DOMContentLoaded', function () {
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const waterfallContainer = document.getElementById('waterfall');
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let columnHeights = [];
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let columnCount = 0;
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let columnWidth = 0;
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const gap = 10;
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// 初始化瀑布流
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async function initWaterfall() {
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// 隐藏所有项目
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const items = document.querySelectorAll('.waterfall-item');
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items.forEach(item => item.style.display = 'none');
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// 移除加载提示
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const loading = document.querySelector('.loading');
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if (loading) loading.remove();
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// 计算列数
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calculateColumns();
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// 预加载所有图片并获取尺寸
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await preloadImages();
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// 定位所有项目
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positionAllItems();
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// 显示所有项目
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items.forEach(item => item.style.display = 'block');
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// 初始化懒加载
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lazyLoadImages();
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}
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// 预加载图片并获取尺寸
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function preloadImages() {
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const images = document.querySelectorAll('.waterfall-item img[data-src]');
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const promises = [];
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images.forEach(img => {
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const promise = new Promise((resolve) => {
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const tempImg = new Image();
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tempImg.src = img.dataset.src;
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tempImg.onload = function () {
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// 保存自然尺寸到数据集
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img.dataset.naturalWidth = this.naturalWidth;
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img.dataset.naturalHeight = this.naturalHeight;
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resolve();
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};
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tempImg.onerror = function () {
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// 加载失败时使用默认尺寸
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img.dataset.naturalWidth = 800;
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img.dataset.naturalHeight = 600;
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resolve();
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};
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});
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promises.push(promise);
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});
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return Promise.all(promises);
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}
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// 计算列数和列宽
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function calculateColumns() {
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const containerWidth = waterfallContainer.offsetWidth;
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const minColumnWidth = 250;
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columnCount = Math.max(1, Math.floor(containerWidth / minColumnWidth));
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columnWidth = containerWidth / columnCount;
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waterfallContainer.style.setProperty('--columns', columnCount);
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columnHeights = new Array(columnCount).fill(0);
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}
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// 定位所有项目
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function positionAllItems() {
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columnHeights = new Array(columnCount).fill(0);
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const items = document.querySelectorAll('.waterfall-item');
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items.forEach(item => {
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positionItem(item);
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});
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waterfallContainer.style.height = Math.max(...columnHeights) + 'px';
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}
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// 定位单个项目
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function positionItem(itemElement) {
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const img = itemElement.querySelector('img');
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const width = parseInt(img.dataset.naturalWidth) || 800;
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const height = parseInt(img.dataset.naturalHeight) || 600;
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const aspectRatio = height / width;
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const minHeight = Math.min(...columnHeights);
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const columnIndex = columnHeights.indexOf(minHeight);
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const left = columnIndex * columnWidth;
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const top = minHeight;
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const itemHeight = columnWidth * aspectRatio + 50; // 50是内容区域高度
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columnHeights[columnIndex] += itemHeight + gap;
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itemElement.style.left = `${left}px`;
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itemElement.style.top = `${top}px`;
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const placeholder = itemElement.querySelector('.img-placeholder');
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placeholder.style.paddingBottom = `${aspectRatio * 100}%`;
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}
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// 懒加载图片（实际显示）
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function lazyLoadImages() {
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const lazyImages = document.querySelectorAll('.waterfall-item img[data-src]');
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const observer = new IntersectionObserver((entries, observer) => {
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entries.forEach(entry => {
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if (entry.isIntersecting) {
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const img = entry.target;
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img.src = img.dataset.src;
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img.onload = () => {
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img.style.opacity = '1';
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img.removeAttribute('data-src');
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};
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observer.unobserve(img);
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}
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});
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}, {
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rootMargin: '0px 0px 200px 0px'
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});
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lazyImages.forEach(img => observer.observe(img));
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}
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// 窗口大小改变时重新计算
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let resizeTimer;
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window.addEventListener('resize', () => {
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clearTimeout(resizeTimer);
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resizeTimer = setTimeout(() => {
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calculateColumns();
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positionAllItems();
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}, 200);
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});
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// 初始化
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initWaterfall();
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// 模拟滚动加载更多数据
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window.addEventListener('scroll', () => {
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if ((window.innerHeight + window.scrollY) >= document.body.offsetHeight - 500) {
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console.log('加载更多数据...');
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// 这里可以添加加载更多数据的逻辑
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// 加载后需要再次调用 preloadImages() 和 positionAllItems()
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}
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});
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});
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</script>
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</body>
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</html> |