js实现无限瀑布流

2019/09/15 22:37
阅读数 29

瀑布流

是一种常见的网页布局方式,在许多网站中我们都能看到“瀑布流”的效果,其特征是有网页视窗有多个高度不同宽度相同的“块”组成。因其样式酷似飞流直下的瀑布,

故将这种布局方式称为瀑布流。

生活中瀑布流实例:

花瓣网

 

在css中我们学习过使用Multi-columns来实现瀑布流的效果

通过 Multi-columns 相关的属性 column-countcolumn-gap 配合 break-inside 来实现瀑布流布局。

现在,我来介绍一下如何通过js方式来实现瀑布流

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .cont{
            margin: 0 auto;
            position: relative; } .box{ float: left; padding: 6px; } .imgbox{ border: 1px black solid; border-radius: 6px; padding: 6px; } .imgbox img{ width: 200px; display: block; } </style> <script> onload = function () { new Waterfall(); }; function Waterfall() { this.ocont = document.querySelector(".cont"); this.abox = document.querySelectorAll(".box"); this.heightArr = []; this.init(); //w1准备数据 this.data = this.load(); this.addScroll(); } Waterfall.prototype.load = function(){ return [{img:"images/1.jpg"},{img:"images/2.jpg"},{img:"images/3.jpg"},{img:"images/4.jpg"},{img:"images/5.jpg"},{img:"images/6.jpg"},{img:"images/7.jpg"},{img:"images/8.jpg"},{img:"images/9.jpg"},{img:"images/10.jpg"},] }; Waterfall.prototype.addScroll = function(){ var that = this; onscroll = function () { if (that.isBottom()){ that.data.forEach(val=>{ var img = document.createElement("img"); img.src = val.img; var imgbox = document.createElement("div"); imgbox.className = "imgbox"; var box = document.createElement("div"); box.className = "box"; imgbox.appendChild(img); box.appendChild(imgbox); that.ocont.appendChild(box); }); that.abox = document.querySelectorAll(".box"); that.heightArr = []; that.firstLine(); that.otherLine(); } } }; Waterfall.prototype.isBottom = function(){ var clientH = document.documentElement.clientHeight; var scrollT = document.documentElement.scrollTop; var scrollH = document.documentElement.scrollHeight; if (clientH + scrollT >= scrollH-200){ return true; }else{ return false; } }; Waterfall.prototype.init = function () { this.num = Math.floor(document.documentElement.clientWidth/this.abox[0].offsetWidth); this.ocont.style.width = this.num*this.abox[0].offsetWidth+"px"; //区分第一行 this.firstLine(); //区分最后一行 this.otherLine(); }; Waterfall.prototype.firstLine = function () { for (var i=0;i<this.num;i++){ this.heightArr.push(this.abox[i].offsetHeight); } }; Waterfall.prototype.otherLine = function () { for (var i=this.num;i<this.abox.length;i++){ var min = getMin(this.heightArr); var minIndex = this.heightArr.indexOf(min); //设置定位,left,top this.abox[i].style.position = "absolute"; this.abox[i].style.top = min + "px"; this.abox[i].style.left = minIndex*this.abox[0].offsetWidth+"px"; this.heightArr[minIndex] += this.abox[i].offsetHeight; } }; function getMin(arr) { var myarr = []; arr.forEach(val =>{ myarr.push(val); }); return myarr.sort((a,b)=>a-b)[0]; } </script> </head> <body> <div class="cont"> <div class="box"> <div class="imgbox"> <img src="images/4.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/3.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/2.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/1.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/5.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/6.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/7.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/8.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/9.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/10.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/4.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/3.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/2.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/1.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/5.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/6.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/7.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/8.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/9.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/10.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/3.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/2.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/1.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/5.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/6.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/7.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/8.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/9.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/10.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/3.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/2.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/1.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/5.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/6.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/7.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/8.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/9.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/10.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/3.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/2.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/1.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/5.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/6.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/7.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/8.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/9.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/10.jpg" alt=""> </div> </div> </div> </body> </html>

 

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