<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>瀑布流布局</title>
<link rel="stylesheet" href="css/style.css" type="text/css">
</head>
<body>
<div id="main">
<div class="box">
<div class="pic">
<img src="image/0.jpg">
</div>
</div>
</div>
<script src="js/script.js"></script>
</body>
</html>
window.onload = function(){
waterfall('main', 'box');
var dataInt = {"data":[{"src": "0.jpg"},{"src": "1.jpg"},{"src": "2.jpg"},{"src": "3.jpg"}]};
window.onscroll = function(){
if(checkScrollSlide()){
// 将数据块渲染到当前页面的尾部
var oParent = document.getElementById('main');
for(var i = 0; i < dataInt.data.length; i++) {
var oBox = document.createElement('div');
oBox.className = 'box';
oParent.appendChild(oBox);
var oPic = document.createElement('div');
oPic.className = 'pic';
oBox.appendChild(oPic);
var oImg = document.createElement('img');
oImg.src="image/"+dataInt.data[i].src;
oPic.appendChild(oImg);
}
waterfall('main', 'box');
}
}
}
function waterfall(parent, box){
// 将main下所有class为box的元素都取出来
var oParent = document.getElementById(parent);
var oBoxs = getByClass(oParent, box);
// 计算整个页面显示的列数（页面宽/box的宽）
var oBoxW = oBoxs[0].offsetWidth;
var cols = Math.floor(document.documentElement.clientWidth/oBoxW);
// 设置main的宽度
oParent.style.cssText='width:'+oBoxW*cols+'px;margin:0 auto;'
var hArr = []; // 存放每一列高度的数组
for(var i = 0; i < oBoxs.length; i++){
if(i < cols){
hArr.push(oBoxs[i].offsetHeight);
} else {
var minH = Math.min.apply(null, hArr);
var index = getMinhIndex(hArr, minH);
oBoxs[i].style.position="absolute";
oBoxs[i].style.top = minH + 'px';
// oBoxs[i].style.left = oBoxW * index + 'px';
oBoxs[i].style.left = oBoxs[index].offsetLeft+'px';
hArr[index] += oBoxs[i].offsetHeight;
}
}
}
// 根据class获取元素
function getByClass(parent, clsName){
var boxArr = new Array(), // 用来存储获取到的所有class为box的元素
oElements=parent.getElementsByTagName("*");
for(var i=0; i<oElements.length; i++){
if(oElements[i].className==clsName){
boxArr.push(oElements[i]);
}
}
return boxArr;
}
function getMinhIndex(arr, val){
for(var i in arr){
if(arr[i] == val) {
return i;
}
}
}
//检测是否具备了滚动加载数据块的条件
function checkScrollSlide(){
var oParent = document.getElementById('main');
var oBoxs = getByClass(oParent, 'box');
var lastBoxH = oBoxs[oBoxs.length-1].offsetTop + Math.floor(oBoxs[oBoxs.length-1].offsetHeight/2);
// 标准模式和混杂模式
var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
var height = document.body.clientHeight || document.documentElement.clientHeight;
return (lastBoxH < scrollTop + height)? true: false;
}
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