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web頁(yè)面和微信小程序頁(yè)面實(shí)現(xiàn)瀑布流效果

發(fā)布時(shí)間:2020-09-04 09:35:24 來(lái)源:腳本之家 閱讀:121 作者:TDX 欄目:web開(kāi)發(fā)

小程序?qū)崿F(xiàn)瀑布流效果,和web頁(yè)面差不多,都要經(jīng)過(guò)以下步驟:

1)、加載圖片,獲取圖片的寬高度;

2)、根據(jù)頁(yè)面需要顯示幾列計(jì)算每列的寬度;

3)、根據(jù)圖片真實(shí)寬度和每列的寬度比,計(jì)算出圖片需要顯示的高度;

4)、重新對(duì)圖片進(jìn)行定位

  1、web頁(yè)面瀑布流效果,先看效果圖(瀑布流+無(wú)限滾動(dòng)加載):

web頁(yè)面和微信小程序頁(yè)面實(shí)現(xiàn)瀑布流效果

 頁(yè)面代碼:

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
  <meta charset='utf-8′> <!--聲明文檔使用的字符編碼-->
  <title>瀑布流_左浮動(dòng)</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="../img/0.jpg"/></div>
  <div class="box"><img src="../img/1.jpg"/></div>
  <div class="box"><img src="../img/2.jpg"/></div>
  <div class="box"><img src="../img/3.jpg"/></div>
  <div class="box"><img src="../img/4.jpg"/></div>
  <div class="box"><img src="../img/5.jpg"/></div>
  <div class="box"><img src="../img/6.jpg"/></div>
  <div class="box"><img src="../img/7.jpg"/></div>
  <div class="box"><img src="../img/8.jpg"/></div>
  <div class="box"><img src="../img/9.jpg"/></div>
  <div class="box"><img src="../img/10.jpg"/></div>
  <div class="box"><img src="../img/11.jpg"/></div>
  <div class="box"><img src="../img/12.jpg"/></div>
  <div class="box"><img src="../img/13.jpg"/></div>
  <div class="box"><img src="../img/14.jpg"/></div>
  <div class="box"><img src="../img/15.jpg"/></div>
  <div class="box"><img src="../img/16.jpg"/></div>
 </div>
 <script type="text/javascript">
  var boxsHeight = []; //盒子高度存儲(chǔ)數(shù)組
  var boxWidth = 230, boxHeight = 230;
  window.onload = function(){
   var boxs = document.getElementsByClassName('box');
   var cols = Math.floor(1200.0/boxWidth); //最多幾列
   //offsetWidth: 包括元素的內(nèi)容寬度+padding+border寬度
   //存儲(chǔ)第一行的每個(gè)盒子的高度到數(shù)組里面
   for (var i = 0; i < cols; i++){
    var obj = boxs[i]; //元素節(jié)點(diǎn)
    if (i < cols){
     boxsHeight.push(obj.offsetHeight);
    }
   }
   updateBoxFrame(cols); //從第二行開(kāi)始更新元素的位置
   window.onscroll = pageScroll; //設(shè)置頁(yè)面滾動(dòng)監(jiān)聽(tīng)函數(shù)
   pageScroll(); //先調(diào)用一次
  }
  //獲取數(shù)組中最小值的索引
  function getMinHeightIndex(arr){
   var minHeight = Math.min.apply(null, arr);
   for (var i = 0; i < arr.length; i++){
    if (arr[i] == minHeight){
     return i;
    }
   }
  }
  //監(jiān)聽(tīng)頁(yè)面滾動(dòng)
  function pageScroll(){
   var parentEle = document.getElementsByClassName('container')[0];
   var subEleCount = parentEle.childElementCount; //子元素個(gè)數(shù)
   var lastBox = parentEle.lastElementChild; //最后一個(gè)元素
   //判斷是否滾動(dòng)到底部
   var doc = document.documentElement||document.body;
   console.log('滾動(dòng)監(jiān)聽(tīng)', doc.scrollTop+",", lastBox.offsetTop+", " + doc.clientHeight);
   if (doc.scrollTop+doc.clientHeight > lastBox.offsetTop){
    //表示該新添加元素了
    addBox();
    //更新新添加元素的位置
    updateBoxFrame(subEleCount);
   }
  }
  //新添加子元素
  function addBox(){
   var parentEle = document.getElementsByClassName('container')[0];
   var arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16];
   for (var i = 0; i < arr.length; i++){
    var index = parseInt(Math.random()*100%arr.length);
    var imgNum = arr[index];
    var div = document.createElement('div');
    div.setAttribute('class', 'box');
    div.innerHTML = '<img src="../img/' + imgNum + '.jpg"/>'
    parentEle.appendChild(div);
    arr.splice(index, 1)
   }
  }
  //更新新添加元素的位置
  function updateBoxFrame(startIndex){
   var boxs = document.getElementsByClassName('box');
   for (var i = startIndex; i < boxs.length; i++){
    var obj = boxs[i];
    //獲取數(shù)組中最小高度的索引
    var minHeightIndex = getMinHeightIndex(boxsHeight);
//     console.log(boxsHeight);
//     console.log(minHeightIndex + ", " +boxsHeight[minHeightIndex]);
    var boxTop = boxsHeight[minHeightIndex] + 20;
    var boxLeft = minHeightIndex * boxWidth;
    console.log(i + ', boxTop: ' + boxTop + ", boxLeft: " + boxLeft);
    //設(shè)置元素的定位樣式
    obj.style = 'position: absolute; top:' + boxTop + "px;left:" + boxLeft+"px";
    boxsHeight[minHeightIndex] = boxTop + obj.offsetHeight;
   }
  }
 </script>
</body>
</html>

  2、小程序?qū)崿F(xiàn)瀑布流,大致流程差不多。只不過(guò)小程序的圖片的寬高度的獲取沒(méi)有web頁(yè)面那么方便。

大概實(shí)現(xiàn)過(guò)程:1)、獲取圖片數(shù)據(jù),頁(yè)面渲染;

      2)、給圖片綁定加載load事件,存儲(chǔ)每個(gè)圖片的寬高度;

      3)、計(jì)算每個(gè)圖片的定位,重新渲染

先看小程序的效果圖(瀑布流+無(wú)限循環(huán)加載):

web頁(yè)面和微信小程序頁(yè)面實(shí)現(xiàn)瀑布流效果

wxml頁(yè)面代碼:

<scroll-view class='main' scroll-y='true'  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頁(yè)面代碼:

// pages/discover/waterfall_flow/waterfall_flow.js
Page({
 /**
 * 頁(yè)面的初始數(shù)據(jù)
 */
 data: {
 dataList: [], //數(shù)據(jù)源
 windowWidth: 0, //頁(yè)面視圖寬度
 windowHeight: 0, //視圖高度
 imgMargin: 6, //圖片邊距: 單位px
 imgWidth: 0, //圖片寬度: 單位px
 topArr: [0, 0], //存儲(chǔ)每列的累積top
 },
 /**
 * 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面加載
 */
 onLoad: function (options) {
 wx.showLoading({
  title: '加載中...',
 })
 var that = this;
 //獲取頁(yè)面寬高度
 wx.getSystemInfo({
  success: function (res) {
  console.log(res)
  var windowWidth = res.windowWidth;
  var imgMargin = that.data.imgMargin;
  //兩列,每列的圖片寬度
  var imgWidth = (windowWidth - imgMargin * 3) / 2;
  that.setData({
   windowWidth: windowWidth,
   windowHeight: res.windowHeight,
   imgWidth: imgWidth
  }, function () {
   that.loadMoreImages(); //初始化數(shù)據(jù)
  });
  },
 })
 },
 //加載圖片
 loadImage: function (e) {
 var index = e.currentTarget.dataset.index; //圖片所在索引
 var imgW = e.detail.width, imgH = e.detail.height; //圖片實(shí)際寬度和高度
 var imgWidth = this.data.imgWidth; //圖片寬度
 var imgScaleH = imgWidth / imgW * imgH; //計(jì)算圖片應(yīng)該顯示的高度
 var dataList = this.data.dataList;
 var margin = this.data.imgMargin; //圖片間距
 //第一列的累積top,和第二列的累積top
 var firtColH = this.data.topArr[0], secondColH = this.data.topArr[1];
 var obj = dataList[index];
 obj.height = imgScaleH;
 if (firtColH < secondColH) { //表示新圖片應(yīng)該放到第一列
  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],
 });
 },
 //加載更多圖片
 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()
 });
 },
 /**預(yù)覽圖片 */
 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頁(yè)面代碼:

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

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

web瀑布流頁(yè)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

小程序瀑布流頁(yè)面地址:https://github.com/xiaotanit/Tan_HtmlDemo/tree/master/wxMini/pages/discover/waterfall_flow

總結(jié)

以上所述是小編給大家介紹的web頁(yè)面和微信小程序頁(yè)面實(shí)現(xiàn)瀑布流效果 ,希望對(duì)大家有所幫助,如果大家有任何疑問(wèn)請(qǐng)給我留言,小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)億速云網(wǎng)站的支持!

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