HTML Tutorial

瀑布流!而且还是响应式的哦!_html/css_WEB-ITnose

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Jun 24, 2016 am 11:17 AM

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没错!这就是瀑布流!是不是很酷炫!看似很难实现,实则很简单!我是用li标签创建这些小块块,当然你也可以根据你的需要在li标签里,插入图片或者其他.下面我们就学习一下,如何实现网页的响应式瀑布流!

第一步编写HTML

可能会有小伙伴认为我们有20个块,需要写20个标签,那你就错了,在JS代码中我们可以利用for循环在HTML中查入10个.100个.1000个你想有多少就有多少!当然你最好提前为你的瀑布流做好css样式,我的这些小块都是由li标签创建的,这样在JS中创造的li标签直接赋予相应的类名.

<!DOCTYPE html><html>    <head>        <meta charset="UTF-8">        <title></title>        <style type="text/css">            * {                margin: 0;                padding: 0;            }            #flow {                list-style: none;                margin: 0 auto;                position: relative;            }            #flow li {                position: absolute;                background-color: #CCCCCC;                font-size: 50px;                width: 200px;                transition: all 0.5s;            }        </style>    </head>    <body>        <ul id="flow">            <!--<li>1</li>-->        </ul>    </body>

第二步 JS代码准备工作

这步中我们需要创建一个随机数,其函数的返回值我们用来定义每一个li元素的高度,当然如果你不想随机定义高度,那你就去写个数组吧!因为我的整体布局距离左边有10px距离,所以此处创建了一个leftSpace变量接受了一下.细心朋友可能已经发现了我的每一个元素期间都有10px的间距,所以此处创建了一个paddingSpace变量来限定每个li元素的间距.其他的在代码中都有相应的注释,自行理解!

<script type="text/javascript">        function ranH (min,max) {            return parseInt(Math.random()*(max-min+1))+min;        }        var flow = document.getElementById("flow");        // 左边距        var leftSpace = 10;        // 间距        var paddingSpace = 10;        //高度数组 保存每个li的高度        var hs = [];

第三步创建li元素

由于在这步代码中,我们会看到出现bol值,而我们是在第四步定义了bol的值,并且根据bol的值来确定layout函数是实现创建li,还是更新li的位置.在这步我们可以先认为bol为true.首先,是创建li标签,然后获取屏幕的宽度根据屏幕的宽度设置一行有几个li标签,再根据li的标签的个数定义ul的宽度.在定义一下每列的li元素的高度,此处的作用是为了第四步的选出最短列而做准备.在给予每个li标签HTML内容,并且保存每个li的高度.

        //布局函数        //bol为真时 创建li        //bol为假时 更新li位置        function layout (bol) {            //获取所有的li 用于大小改变时 更新布局            var lis = document.getElementsByTagName("li");            var cols = parseInt(document.documentElement.clientWidth/200);                //ul宽度 跟随宽度一起变化            flow.style.width = cols*200 + 10*(cols-1)+20;            //初始化列高数组            var arrH =[];            for (var i = 0; i < cols; i++) {                arrH[i]=10;            }            function createLi (index) {                //获取已有的li或者新建                var li = lis[index]||document.createElement("li");                li.innerHTML = index;                //从数组中获取高度或者随机高度                var h = hs[index]||ranH(100,300);                li.style.height = h+"px";                if (bol) {                    hs.push(h);                }

第四步插入创建好的带有内容li标签.并且与第三步呼应,实现响应式瀑布流.

首先求出最短列,将li元素插入最短列下,定义每一个li的位置.在最后利用系统的window.onresize 函数,当屏幕尺寸改变时执行layout()方法中,更新li位置的方法,以实现响应式瀑布流!

//求最短列                var minH = arrH[0];                var minI = 0;                for (var i = 0; i < cols; i++) {                    if (minH>arrH[i]) {                        minH=arrH[i];                        minI=i;                    }                }                //设置left                var  l = leftSpace+(200+paddingSpace)*minI;                li.style.left = l+"px";                //设置top                li.style.top = arrH[minI]+"px";                //添加                bol&&flow.appendChild(li);//                alert(li.offsetLeft+"~"+li.offsetTop+"~"+li.offsetWidth+"~"+li.offsetHeight);                //更新高度                arrH[minI] = arrH[minI] + li.offsetHeight +paddingSpace;            }            for (var i =0 ; i < 20 ;i++) {                createLi(i);            }        }        //创建        layout(true);        window.onresize =function  () {            //更新            layout(false);        }    </script></html>

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