简易瀑布流

基于jquery的简易瀑布流
代码如下：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>瀑布流</title>
<style type="text/css">
#divFlow {margin:20px; border:solid 1px gray; background-color:white; position:relative;}
.divFlowItem {border:solid 1px gray; background-color:#eff; position:absolute; left:-2000px;}
</style>
<script src="js/jquery.js"></script>
</head>
<body style="background-color:#eee; overflow-y: scroll;">

<div id="divFlow">

</div>

<script>

// 超简单易懂瀑布流 by http://www.cnblogs.com/zjfree

// 刷新瀑布流
function resetFlow()
{
    var allWidth = $('#divFlow').width();
    
    var arr = [];
    $('#divFlow>div').each(function(){
        arr.push({el:this, w:$(this).width(), h:$(this).height()});
    });
    
    var marginX = flowItemMargin;
    var colNum = parseInt((allWidth - marginX) / (marginX + flowItemWidth));
    colNum = Math.max(colNum, 1);
    
    marginX = parseInt((allWidth - colNum * flowItemWidth) / (colNum + 1));
    marginX = Math.max(marginX, flowItemMargin);
    
    var marginY = parseInt(marginX / 2);
    marginY = Math.max(marginY, flowItemMargin);
    
    var colHeight = [];
    for (var i=0; i<colNum; i++)
    {
        colHeight[i] = 0;
    }
    
    var j = 0;
    while(true)
    {
        var min = colHeight[0];
        var mini = 0;
        for (var i=1; i<colNum; i++)
        {
            if (colHeight[i] < min)
            {
                mini = i;
                min = colHeight[i];
            }
        }
        
        if (j == arr.length) break;
        
        arr[j].el.style.top = colHeight[mini] + marginY + 'px';
        arr[j].el.style.left = marginX + (flowItemWidth + marginX) * mini + 'px';
        colHeight[mini] += arr[j].h + marginY;
        j++;
    }
    
    var maxHeight = 0;
    for (var i=0; i<colNum; i++)
    {
        maxHeight = Math.max(colHeight[i], maxHeight);
    }
    
    maxHeight += marginY;
    
    $('#divFlow').css('height', maxHeight + 'px');
}

var flowItemWidth = 300;    // 单位宽度
var flowItemMargin = 10;    // 单位间隔

// 加载数据
function add()
{
    for (var i=0; i<20; i++)
    {
        var div = document.createElement("div");
        div.style.cssText = '' + flowItemWidth + 'px;';
        div.className = 'divFlowItem';
        
        // 加载时修改如下
        div.innerHTML = 'hahah';
        div.style.height = 50 + Math.round(Math.random() * 300) + 'px';
        
        $('#divFlow').append(div);
    }
    
    resetFlow();
}

$(function (){
    // 当窗口改变大小时刷新
    $(window).resize(resetFlow);
    
    // 当滚动到最底部时加载新数据
    $(window).scroll(function () {
        if (($(window).height() + $(window).scrollTop()) > $('body').height()) {
            add();
        }
    });
    
    add();
});
</script>

</body></html>
下载：http://files.cnblogs.com/zjfree/jsFlow.rar