DDR爱好者之家 Design By 杰米

小程序实现瀑布流效果,和web页面差不多,都要经过以下步骤:

1)、加载图片,获取图片的宽高度;

2)、根据页面需要显示几列计算每列的宽度;

3)、根据图片真实宽度和每列的宽度比,计算出图片需要显示的高度;

4)、重新对图片进行定位

  1、web页面瀑布流效果,先看效果图(瀑布流+无限滚动加载):

web页面和微信小程序页面实现瀑布流效果

 页面代码:

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
  <meta charset='utf-8′> <!--声明文档使用的字符编码-->
  <title>瀑布流_左浮动</title>
 <style type="text/css">
  *{margin:0;padding:0;}
  .container {
   width: 1200px; height: auto; margin: 50px auto;
   position: relative;
  }
  .box{
   padding: 5px; box-shadow: 0 0 10px purple; border-radius: 5px;
   float: left; margin: 10px;
  }
  .box img { width: 200px; height: auto; }
 </style>
</head>
<body>
 <div class="container">
  <div class="box"><img src="/UploadFiles/2021-04-02/0.jpg">

  2、小程序实现瀑布流,大致流程差不多。只不过小程序的图片的宽高度的获取没有web页面那么方便。

大概实现过程:1)、获取图片数据,页面渲染;

      2)、给图片绑定加载load事件,存储每个图片的宽高度;

      3)、计算每个图片的定位,重新渲染

先看小程序的效果图(瀑布流+无限循环加载):

web页面和微信小程序页面实现瀑布流效果

wxml页面代码:

<scroll-view class='main' scroll-y='true' style="height:{{windowHeight}}px" bindscrolltolower='loadMoreImages'>
 <image wx:for='{{dataList}}' wx:key='item' src='{{item.src}}' style='position: absolute; top: {{item.top}}px; left: {{item.left}}px; width: {{imgWidth}}px; height: {{item.height}}px' bindload='loadImage' data-index='{{index}}' bindtap='previewImg'/>
</scroll-view>

js页面代码:

// pages/discover/waterfall_flow/waterfall_flow.js
Page({
 /**
 * 页面的初始数据
 */
 data: {
 dataList: [], //数据源
 windowWidth: 0, //页面视图宽度
 windowHeight: 0, //视图高度
 imgMargin: 6, //图片边距: 单位px
 imgWidth: 0, //图片宽度: 单位px
 topArr: [0, 0], //存储每列的累积top
 },
 /**
 * 生命周期函数--监听页面加载
 */
 onLoad: function (options) {
 wx.showLoading({
  title: '加载中...',
 })
 var that = this;
 //获取页面宽高度
 wx.getSystemInfo({
  success: function (res) {
  console.log(res)
  var windowWidth = res.windowWidth;
  var imgMargin = that.data.imgMargin;
  //两列,每列的图片宽度
  var imgWidth = (windowWidth - imgMargin * 3) / 2;
  that.setData({
   windowWidth: windowWidth,
   windowHeight: res.windowHeight,
   imgWidth: imgWidth
  }, function () {
   that.loadMoreImages(); //初始化数据
  });
  },
 })
 },
 //加载图片
 loadImage: function (e) {
 var index = e.currentTarget.dataset.index; //图片所在索引
 var imgW = e.detail.width, imgH = e.detail.height; //图片实际宽度和高度
 var imgWidth = this.data.imgWidth; //图片宽度
 var imgScaleH = imgWidth / imgW * imgH; //计算图片应该显示的高度
 var dataList = this.data.dataList;
 var margin = this.data.imgMargin; //图片间距
 //第一列的累积top,和第二列的累积top
 var firtColH = this.data.topArr[0], secondColH = this.data.topArr[1];
 var obj = dataList[index];
 obj.height = imgScaleH;
 if (firtColH < secondColH) { //表示新图片应该放到第一列
  obj.left = margin;
  obj.top = firtColH + margin;
  firtColH += margin + obj.height;
 }
 else { //放到第二列
  obj.left = margin * 2 + imgWidth;
  obj.top = secondColH + margin;
  secondColH += margin + obj.height;
 }
 this.setData({
  dataList: dataList,
  topArr: [firtColH, secondColH],
 });
 },
 //加载更多图片
 loadMoreImages: function () {
 var imgs = [
  'https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1409185525,4059560780&fm=26&gp=0.jpg',
  'https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=4076355782,2436939971&fm=15&gp=0.jpg',
  'https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=777075993,2126273204&fm=11&gp=0.jpg',
  'https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=57777155,3251523579&fm=11&gp=0.jpg',
  'https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=3825727093,2830650732&fm=11&gp=0.jpg',
  'https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=2379065095,654347953&fm=26&gp=0.jpg',
  'https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=2749679283,2472217536&fm=11&gp=0.jpg',
  'https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=677128138,409184861&fm=11&gp=0.jpg',
  'https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=1884091074,3049103326&fm=26&gp=0.jpg',
  'https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1600363417,3661952978&fm=11&gp=0.jpg',
  'https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=2069544162,3090555174&fm=11&gp=0.jpg',
  'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=3328655038,3143543956&fm=26&gp=0.jpg',
  'https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=3953624046,2332872335&fm=26&gp=0.jpg',
  'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=717009955,687560133&fm=26&gp=0.jpg',
  'https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=4243037288,2388509769&fm=26&gp=0.jpg',
  'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2644451528,4180971732&fm=26&gp=0.jpg',
  'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2658655215,924706045&fm=26&gp=0.jpg',
  'https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=400545645,1325440240&fm=26&gp=0.jpg',
  'https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=2735743532,3162562682&fm=11&gp=0.jpg',
  'https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=2357555025,1781222560&fm=26&gp=0.jpg',
  'https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=1604156508,3282489713&fm=26&gp=0.jpg',
  'https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=380663325,2271064034&fm=26&gp=0.jpg',
  'https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=174537541,3462862985&fm=26&gp=0.jpg',
  'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=1752649241,364583051&fm=26&gp=0.jpg',
  'https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=2890516059,4166188770&fm=27&gp=0.jpg',
  'https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=2435144503,200941795&fm=11&gp=0.jpg',
  'https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=877833827,2847590581&fm=26&gp=0.jpg',
  'https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=894452177,2810600152&fm=11&gp=0.jpg',
  'https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=4053642431,248486335&fm=27&gp=0.jpg',
  'https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=2914607659,905736210&fm=11&gp=0.jpg',
  'https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=1629456501,1514429218&fm=26&gp=0.jpg',
 ];
 var tmpArr = [];
 for (let i = 0; i < 22; i++) {
  var index = parseInt(Math.random() * 100) % imgs.length;
  var obj = {
  src: imgs[index],
  height: 0,
  top: 0,
  left: 0,
  }
  tmpArr.push(obj);
  imgs.splice(index, 1);
 }
 var dataList = this.data.dataList.concat(tmpArr)
 this.setData({ dataList: dataList }, function(){
  wx.hideLoading()
 });
 },
 /**预览图片 */
 previewImg: function (e) {
 var index = e.currentTarget.dataset.index;
 var dataList = this.data.dataList;
 var currentSrc = dataList[index].src;
 // var srcArr = dataList.map(function (item) {
 // return item.src;
 // });
 wx.previewImage({
  urls: [currentSrc],
 })
 },
})

wxss页面代码:

.main{ width: 100%; height: 100%; position: relative; }
.main image {
 box-shadow: 0 0 10rpx red; border-radius: 8rpx;
}
 

DEMO下载:https://github.com/xiaotanit/Tan_HtmlDemo

web瀑布流页面地址:https://github.com/xiaotanit/Tan_HtmlDemo/blob/master/JS/%E7%80%91%E5%B8%83%E6%B5%81_%E5%B7%A6%E6%B5%AE%E5%8A%A8.html

小程序瀑布流页面地址:https://github.com/xiaotanit/Tan_HtmlDemo/tree/master/wxMini/pages/discover/waterfall_flow

总结

以上所述是小编给大家介绍的web页面和微信小程序页面实现瀑布流效果 ,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对网站的支持!

DDR爱好者之家 Design By 杰米
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DDR爱好者之家 Design By 杰米