鼠标滚动事件，当鼠标滚动到下边，动态加载图片。
1. HTML代码
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>js实现瀑布流效果-动态加载图片</title> <link href="https://www.jb51.net/css/waterfallflow.css" type="text/css" /> <script src="https://www.jb51.net/js/waterfallflow.js"></script> </head> <body> <div> <div> <div> <img src="https://www.jb51.net/img/1.jpg" /> </div> </div> <div> <div> <img src="https://www.jb51.net/img/2.jpg" /> </div> </div> <div> <div> <img src="https://www.jb51.net/img/3.jpg" /> </div> </div> <div> <div> <img src="https://www.jb51.net/img/4.jpg" /> </div> </div> <div> <div> <img src="https://www.jb51.net/img/5.jpg" /> </div> </div> <div> <div> <img src="https://www.jb51.net/img/6.jpg" /> </div> </div> <div> <div> <img src="https://www.jb51.net/img/7.jpg" /> </div> </div> <div> <div> <img src="https://www.jb51.net/img/3.jpg" /> </div> </div> <div> <div> <img src="https://www.jb51.net/img/1.jpg" /> </div> </div> <div> <div> <img src="https://www.jb51.net/img/2.jpg" /> </div> </div> <div> <div> <img src="https://www.jb51.net/img/1.jpg" /> </div> </div> <div> <div> <img src="https://www.jb51.net/img/2.jpg" /> </div> </div> <div> <div> <img src="https://www.jb51.net/img/3.jpg" /> </div> </div> <div> <div> <img src="https://www.jb51.net/img/4.jpg" /> </div> </div> <div> <div> <img src="https://www.jb51.net/img/5.jpg" /> </div> </div> <div> <div> <img src="https://www.jb51.net/img/6.jpg" /> </div> </div> </div> </body> </html>
2. CSS代码
*{ margin: 0px; padding: 0px; } #container{ position: relative; } .box{ padding: 5px; float: left; margin: 0px auto; } .box_img{ padding: 5px; border: 1px solid #DCDCDC; box-shadow: 0 0 5px #ccc; border-radius: 5px; } .box_img img{ width: 230px; }
3. JavaScript代码
window.onload=function(){ imgLocation("container","box"); var imgData={"data":[{"src":"1.jpg"},{"src":"2.jpg"},{"src":"3.jpg"},{"src":"3.jpg"},{"src":"4.jpg"},{"src":"5.jpg"},{"src":"6.jpg"},{"src":"2.jpg"},{"src":"3.jpg"},{"src":"3.jpg"},{"src":"4.jpg"},{"src":"5.jpg"}]} window.onscroll=function(){ // console.log(document.documentElement.scrollTop); if(checkFlag()){ var cparent=document.getElementById("container"); for(var i=0;i<imgData.data.length;i++){ var ccontent=document.createElement("div"); ccontent.className="box"; cparent.appendChild(ccontent); var boximg=document.createElement("div"); boximg.className="box_img"; ccontent.appendChild(boximg); var img=document.createElement("img"); img.src="https://www.jb51.net/article/img/"+imgData.data[i].src; boximg.appendChild(img); //另外一种方法在div后边追加内容，不覆盖原有内容 // var content="<div><div><img src='img/"+imgData.data[i].src+"'/></div></div>"; // cparent.innerHTML+=content; } imgLocation("container","box"); } } } function checkFlag(){ var cparent=document.getElementById("container"); var ccontent=getChildElement(cparent,"box");//图片的所有box数 var lastContentHeight=ccontent[ccontent.length-1].offsetTop;//最后一张图片距离顶部高度 var scrollTop=document.documentElement.scrollTop||document.body.scrollTop;//滚动条距离顶部高度 var pageHeight=document.documentElement.clientHeight||document.body.clientHeight;//屏幕高度 // console.log(lastContentHeight+","+scrollTop+","+pageHeight); if(lastContentHeight<scrollTop+pageHeight){ return true; } } function imgLocation(parent,content){ var cparent=document.getElementById(parent); var ccontent=getChildElement(cparent,content);//图片的所有box数 var imgWidth=ccontent[0].offsetWidth;//图片宽度 var num=Math.floor(document.documentElement.clientWidth/imgWidth);//一行放图片个数 cparent.style.cssText="width:"+imgWidth*num+"px;margin:0px auto";//container的宽度 var boxHeightArr=[];//每一列box高度 for(var i=0;i<ccontent.length;i++){ if(i<num){ boxHeightArr[i]=ccontent[i].offsetHeight; }else{ var minHeight=Math.min.apply(null,boxHeightArr);//最小高度 var minIndex = getMinheightLocation(boxHeightArr,minHeight);//得到最小高度下标 // console.log(minHeight+","+minIndex); ccontent[i].style.position="absolute"; ccontent[i].style.top=minHeight+"px";//距离顶部高度 ccontent[i].style.left=ccontent[minIndex].offsetLeft+"px";//距离左边长度 boxHeightArr[minIndex]+=ccontent[i].offsetHeight; // console.log(ccontent[i].offsetHeight+","+ccontent[i].height);//ccontent[i].height=undefined } } } function getMinheightLocation(boxHeightArr,minHeight){ for(var i in boxHeightArr){ if(boxHeightArr[i]==minHeight){ return i } } } function getChildElement(parent,content){ //将parent下有content的全部取出 var contentArr=[]; var allContent=parent.getElementsByTagName("*"); for(i=0;i<allContent.length;i++){ if(allContent[i].className=="box"){ contentArr.push(allContent[i]); } } return contentArr; }