瀑布流!而且还是响应式的哦!_html/css_WEB-ITnose
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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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