javascript实现瀑布流动态加载图片原理
本文实例为大家分享了js瀑布流加载效果，动态加载图片，供大家参考，具体内容如下
鼠标滚动事件，当鼠标滚动到下边，动态加载图片。
1.HTML代码
<!DOCTYPEhtml> <html> <head> <metacharset="UTF-8"> <title>js实现瀑布流效果-动态加载图片</title> <linkrel="stylesheet"href="css/waterfallflow.css"type="text/css"/> <scriptsrc="js/waterfallflow.js"></script> </head> <body> <divid="container"> <divclass="box"> <divclass="box_img"> <imgsrc="img/1.jpg"/> </div> </div> <divclass="box"> <divclass="box_img"> <imgsrc="img/2.jpg"/> </div> </div> <divclass="box"> <divclass="box_img"> <imgsrc="img/3.jpg"/> </div> </div> <divclass="box"> <divclass="box_img"> <imgsrc="img/4.jpg"/> </div> </div> <divclass="box"> <divclass="box_img"> <imgsrc="img/5.jpg"/> </div> </div> <divclass="box"> <divclass="box_img"> <imgsrc="img/6.jpg"/> </div> </div> <divclass="box"> <divclass="box_img"> <imgsrc="img/7.jpg"/> </div> </div> <divclass="box"> <divclass="box_img"> <imgsrc="img/3.jpg"/> </div> </div> <divclass="box"> <divclass="box_img"> <imgsrc="img/1.jpg"/> </div> </div> <divclass="box"> <divclass="box_img"> <imgsrc="img/2.jpg"/> </div> </div> <divclass="box"> <divclass="box_img"> <imgsrc="img/1.jpg"/> </div> </div> <divclass="box"> <divclass="box_img"> <imgsrc="img/2.jpg"/> </div> </div> <divclass="box"> <divclass="box_img"> <imgsrc="img/3.jpg"/> </div> </div> <divclass="box"> <divclass="box_img"> <imgsrc="img/4.jpg"/> </div> </div> <divclass="box"> <divclass="box_img"> <imgsrc="img/5.jpg"/> </div> </div> <divclass="box"> <divclass="box_img"> <imgsrc="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:0pxauto;
}
.box_img{
padding:5px;
border:1pxsolid#DCDCDC;
box-shadow:005px#ccc;
border-radius:5px;
}
.box_imgimg{
width:230px;
}
3.JavaScript代码
window.onload=function(){
imgLocation("container","box");
varimgData={"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()){
varcparent=document.getElementById("container");
for(vari=0;i<imgData.data.length;i++){
varccontent=document.createElement("div");
ccontent.className="box";
cparent.appendChild(ccontent);
varboximg=document.createElement("div");
boximg.className="box_img";
ccontent.appendChild(boximg);
varimg=document.createElement("img");
img.src="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
//varcontent="<divclass='box'><divclass='box_img'><imgsrc='img/"+imgData.data[i].src+"'/></div></div>";
//cparent.innerHTML+=content;
}
imgLocation("container","box");
}
}
}
functioncheckFlag(){
varcparent=document.getElementById("container");
varccontent=getChildElement(cparent,"box");//图片的所有box数
varlastContentHeight=ccontent[ccontent.length-1].offsetTop;//最后一张图片距离顶部高度
varscrollTop=document.documentElement.scrollTop||document.body.scrollTop;//滚动条距离顶部高度
varpageHeight=document.documentElement.clientHeight||document.body.clientHeight;//屏幕高度
//console.log(lastContentHeight+","+scrollTop+","+pageHeight);
if(lastContentHeight<scrollTop+pageHeight){
returntrue;
}
}
functionimgLocation(parent,content){
varcparent=document.getElementById(parent);
varccontent=getChildElement(cparent,content);//图片的所有box数
varimgWidth=ccontent[0].offsetWidth;//图片宽度
varnum=Math.floor(document.documentElement.clientWidth/imgWidth);//一行放图片个数
cparent.style.cssText="width:"+imgWidth*num+"px;margin:0pxauto";//container的宽度
varboxHeightArr=[];//每一列box高度
for(vari=0;i<ccontent.length;i++){
if(i<num){
boxHeightArr[i]=ccontent[i].offsetHeight;
}else{
varminHeight=Math.min.apply(null,boxHeightArr);//最小高度
varminIndex=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
}
}
}
functiongetMinheightLocation(boxHeightArr,minHeight){
for(variinboxHeightArr){
if(boxHeightArr[i]==minHeight){
returni
}
}
}
functiongetChildElement(parent,content){
//将parent下有content的全部取出
varcontentArr=[];
varallContent=parent.getElementsByTagName("*");
for(i=0;i<allContent.length;i++){
if(allContent[i].className=="box"){
contentArr.push(allContent[i]);
}
}
returncontentArr;
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。