web页面和微信小程序页面实现瀑布流效果
程序员文章站
2022-06-19 18:17:49
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...
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):
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="../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 = []; //盒子高度存储数组 var boxwidth = 230, boxheight = 230; window.onload = function(){ var boxs = document.getelementsbyclassname('box'); var cols = math.floor(1200.0/boxwidth); //最多几列 //offsetwidth: 包括元素的内容宽度+padding+border宽度 //存储第一行的每个盒子的高度到数组里面 for (var i = 0; i < cols; i++){ var obj = boxs[i]; //元素节点 if (i < cols){ boxsheight.push(obj.offsetheight); } } updateboxframe(cols); //从第二行开始更新元素的位置 window.onscroll = pagescroll; //设置页面滚动监听函数 pagescroll(); //先调用一次 } //获取数组中最小值的索引 function getminheightindex(arr){ var minheight = math.min.apply(null, arr); for (var i = 0; i < arr.length; i++){ if (arr[i] == minheight){ return i; } } } //监听页面滚动 function pagescroll(){ var parentele = document.getelementsbyclassname('container')[0]; var subelecount = parentele.childelementcount; //子元素个数 var lastbox = parentele.lastelementchild; //最后一个元素 //判断是否滚动到底部 var doc = document.documentelement||document.body; console.log('滚动监听', doc.scrolltop+",", lastbox.offsettop+", " + doc.clientheight); if (doc.scrolltop+doc.clientheight > lastbox.offsettop){ //表示该新添加元素了 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]; //获取数组中最小高度的索引 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); //设置元素的定位样式 obj.style = 'position: absolute; top:' + boxtop + "px;left:" + boxleft+"px"; boxsheight[minheightindex] = boxtop + obj.offsetheight; } } </script> </body> </html>
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):
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
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
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