HTML:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>時間對象</title>
</head>
<body>
<div id="container">
<div class="box">
<div class="box_img">
<img src="img/1.jpg">
</div>
</div>
<div class="box">
<div class="box_img">
<img src="img/2.jpg">
</div>
</div>
<div class="box">
<div class="box_img">
<img src="img/3.jpg">
</div>
</div>
<div class="box">
<div class="box_img">
<img src="img/4.jpg">
</div>
</div>
<div class="box">
<div class="box_img">
<img src="img/5.jpg">
</div>
</div>
</div>
</body>
</html>
CSS:
*{
margin: 0px;
padding: 0px;
}
#container{
position: relative;
}
.box{
padding: 5px;
float: left;
}
.box_img{
padding: 5px;
border: 1px solid #000000;
box-shadow: 0 0 5px #cccc0c;
border-radius: 5px;
}
.box_img img{
width: 150px;
height: auto;
}
JS:
window.onload=function (){
imgLocation("container","box")
var imgData={"data":[{"src":"2.jpg"},{"src":"3.jpg"}]};
window.onscroll=function () {
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 = "img/"+imgData.data[i].src;
boximg.appendChild(img);
}
imgLocation("container","box");
}
}
}
//計算最後一張圖片距離頂部的高度
function checkFlag() {
var cparent=document.getElementById("container");
var ccontent=getChildElement(cparent,"box");
var lastContentHeight=ccontent[ccontent.length-1].offsetTop;
//滾動條滾動的高度
//console.log(lastContentHeight);
var scrollTop=document.documentElement.scrollTop||document.body.scrollTop;
//頁面的高度
//console.log(scrollTop);
var pageHeight=document.documentElement.clientHeight||document.body.clientHeight;
//console.log(lastContentHeight+":"+scrollTop+":"+pageHeight);
if (lastContentHeight<scrollTop+pageHeight){
return true;
}
}
function imgLocation(parent,content) {
//將parent下多有的content全部取出
var cparent=document.getElementById(parent);
var ccontent=getChildElement(cparent,content);
var imgWidth=ccontent[0].offsetWidth;
var num=Math.floor(document.documentElement.clientWidth / imgWidth);
cparent.style.cssText="width:"+imgWidth*num+"px;margin:0 auto";
//將第二排圖片放在第一排最小的圖片下方
var BoxHeightArr=[];
for (var i=0;i<ccontent.length;i++){
if (i<num) {
BoxHeightArr[i] = ccontent[i].offsetHeight;
//收集圖片的高度.
//console.log(BoxHeightArr[i]);
}else{
//選擇最小
var minheight=Math.min.apply(null,BoxHeightArr);
var minIndex =getminheightLocation(BoxHeightArr,minheight);
ccontent[i].style.position="absolute";
ccontent[i].style.top=minheight+"px";
//依次尋找最小高度的圖片，然後放置在下面.
ccontent[i].style.left=ccontent[minIndex].offsetLeft+"px";
BoxHeightArr[minIndex]=BoxHeightArr[minIndex]+ccontent[i].offsetHeight;
}
}
}
function getminheightLocation(BoxHeightArr,minHeight) {
for (var i in BoxHeightArr){
if(BoxHeightArr[i]==minHeight){
return i;
}
}
}
function getChildElement(parent,content) {
var contentArr=[];
var allcontent=parent.getElementsByTagName("*");
for (var i=0;i<allcontent.length;i++){
if (allcontent[i].className ==content){
contentArr.push(allcontent[i]);
}
}
return contentArr;
}