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javascript瀑布流
哇，瀑布流，是的，不错，不错，真的不错，很好玩的样子，于是自己想玩玩啊，来吧，就玩起。
循序渐进，我这里采用原生的js代码来书写。为了方便大家运行代码，我就全部样式和CSS都写在html里面了，当然还需要图片，我会打包。
来上代码。
直接代码
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>哇，瀑布流啊</title>
<style type="text/css">
@media screen and (min-width:1550px){
.waterfall-container {
width:1400px;
}
}
@media screen and (max-width:1549px) and (min-width:1366px){
.waterfall-container {
width:1200px;
}
}
@media screen and (max-width:1365px) and (min-width:700px) {
.waterfall-container {
width:500px;
}
}
@media screen and (max-width:699px) {
.waterfall-container {
width:350px;
}
}
.waterfall-container{
top: 0;
float:left;
display:inline;
position:relative;
}
.water-molecule {
position:absolute;
border: solid 1px #ccc;
padding: 10px;
width: 200px;
top: 0px;
left: 0px;
-webkit-transition: all .7s ease-out .1s;
-moz-transition: all .7s ease-out .1s;
-o-transition: all .7s ease-out .1s;
transition: all .7s ease-out .1s
}
img { width: 100%; }
</style>
</head>
<body >
<div>
哟，好拽的瀑布流！！！
</div>
<div style="position:relative">
<div style="left:0; float:left; display:inline; width:100px">
<ul id="mediaSet">
<li><a href="http://www.mamicode.com/#">1300px</a></li>
<li><a href="http://www.mamicode.com/#">1100px</a></li>
<li><a href="http://www.mamicode.com/#">900px</a></li>
<li><a href="http://www.mamicode.com/#">600px</a></li>
</ul>
</div>
<div class="waterfall-container">
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img02.jpg"><img src="http://www.mamicode.com/images/temp_img02.jpg"/></a> </div>
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img03.jpg"><img src="http://www.mamicode.com/images/temp_img03.jpg"/></a> </div>
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img04.jpg"><img src="http://www.mamicode.com/images/temp_img04.jpg"/></a> </div>
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img09.jpg"><img src="http://www.mamicode.com/images/temp_img09.jpg"/></a> </div>
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img05.jpg"><img src="http://www.mamicode.com/images/temp_img05.jpg"/></a> </div>
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img06.jpg"><img src="http://www.mamicode.com/images/temp_img06.jpg"/></a> </div>
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img07.jpg"><img src="http://www.mamicode.com/images/temp_img07.jpg"/></a> </div>
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img08.jpg"><img src="http://www.mamicode.com/images/temp_img08.jpg"/></a> </div>
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img09.jpg"><img src="http://www.mamicode.com/images/temp_img09.jpg"/></a> </div>
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img10.jpg"><img src="http://www.mamicode.com/images/temp_img10.jpg"/></a> </div>
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img11.jpg"><img src="http://www.mamicode.com/images/temp_img11.jpg"/></a> </div>
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img12.jpg"><img src="http://www.mamicode.com/images/temp_img12.jpg"/></a> </div>
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img13.jpg"><img src="http://www.mamicode.com/images/temp_img13.jpg"/></a> </div>
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img14.jpg"><img src="http://www.mamicode.com/images/temp_img14.jpg"/></a> </div>
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img15.jpg"><img src="http://www.mamicode.com/images/temp_img15.jpg"/></a> </div>
<div class="water-molecule"><a href="http://www.mamicode.com/images/temp_img15.jpg"><img src="http://www.mamicode.com/images/temp_img15.jpg"/></a> </div>
</div>
</div>
<script type="text/javascript">
function minColunmnIndex (arr) {
var minColumn = 0;
var min = arr[minColumn];
for (var i = 1,len=arr.length; i < len; i++) {
var temp = arr[i];
if (temp < min) {
minColumn = i;
min = temp;
};
};
return minColumn;
}
Object.extend = function(destination, source) {
for (var property in source) {
destination[property] = source[property];
}
return destination;
}
function waterWall(container,settings){
var _settings = {
margin:10,
cellClass:"water-molecule"
};
if(typeof settings != "undefined"){
_settings = Object.extend(_settings,settings);
}
var margin = _settings.margin;
var boxes = document.getElementsByClassName(_settings.cellClass);
var wContainer = container;
var boxWidth = boxes[0].offsetWidth + margin;
function waterfall () {
var columnHeight=[];
var waterFallWith = container.offsetWidth;
var n = parseInt(waterFallWith/boxWidth);
var columnNum = n == 0 ? 1 : n;
var baseLeft = wContainer.offsetLeft;
for (var i = 0,l=boxes.length; i <l ; i++) {
if (i<columnNum) {
columnHeight[i]=boxes[i].offsetHeight+margin;
boxes[i].style.top = 0;
boxes[i].style.left = i*boxWidth+margin+‘px‘;
} else{
var innsertColumn = minColunmnIndex(columnHeight),
imgHeight = boxes[i].offsetHeight+ margin;
boxes[i].style.top = columnHeight[innsertColumn]+‘px‘;
boxes[i].style.left = innsertColumn*boxWidth+margin+‘px‘;
columnHeight[innsertColumn] +=imgHeight;
};
};
};
var wf = {
master: container,
waterfall:waterfall
}
return wf;
}
var wf = new waterWall(document.getElementsByClassName("waterfall-container").item(0));
window.onload = function(){wf.waterfall();};
window.onresize = function(){
wf.master.style.width = null;
wf.waterfall();
};
document.getElementById("mediaSet").addEventListener("click",function(ev){
var link = ev.target,
width = link.text;
wf.master.style.width = width;
wf.waterfall();
},false);
</script>
</body>
</html>
分析：
1. 核心就是waterfall方法，计算当前容器的offsetWith，和定义好的单位元素的宽度以及定义的margin来计算列数，再通过当前索引
2. minColumnIndex来计算当前高度最小的列，然后取改列已经存有的高度作为top的值，用 index * 单位元素的宽度 + margin作为 left的值
3.头部定义媒体查询，做到初始化的时候，自动调整，当然，在resize的时候可以动态重新计算，我这里没有这么做
4. 设置了几个 1300,100， 900， 600几个值，用来点击测试。
源码下载：
http://files.cnblogs.com/files/mouse_in_beijing/PB.zip
javascript瀑布流
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