JavaScript瀑布流布局实现代码
程序员文章站
2023-11-18 14:10:10
先说一下什么是瀑布流布局。
就是一堆等宽不等高的数据块组成的页面,如图:
现在好多网站都采用这种瀑布流布局,如蘑菇街。美丽说等等。
首先要实现它就要明白它...
先说一下什么是瀑布流布局。
就是一堆等宽不等高的数据块组成的页面,如图:
现在好多网站都采用这种瀑布流布局,如蘑菇街。美丽说等等。
首先要实现它就要明白它是怎样排列的。
每一行的列数都是根据图片的宽度和页面的宽度算比例算下来的。。
第一行就是按顺序排列,其他的数据块都是在每一列中挑选出最低的那一列依次排进去的。
首先实现框架。
<div id = "main"> <div class = "box"> <div class = "pic"> <img src = "images/0.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/1.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/2.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/3.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/4.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/5.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/6.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/7.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/8.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/9.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/10.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/11.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/12.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/13.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/14.jpg"> </div> </div> </div>
这里定义了14个图片,每个图片都被一个class= box的属性和class= “pic”的属性包裹,在css中定义其样式:
*{ padding: 0px; margin: 0px; } #main{ position: relative; } .box{ /* display: inline-block;*/ padding: 15px 0px 0px 15px; float: left; } .pic{ padding: 10px; border-radius: 5px; border:1px solid #ccc; box-shadow: 0 0 5px #ccc; } .pic img{ width: 165px; height: auto; } </style>
效果图如下:
其实每一行六个图片不是固定的,当你缩小窗口时,它会成为两列,或者三列四列。但我们为了以后的布局,就将它设置为固定的列数,即根据窗口的大小除以图片的大小,向下取整。
接下来写的是js实现的瀑布流布局。
在写代码之前,由于要用到box属性,而js中没有直接定义获得class的方法,所以我们在这儿要写一个获得class的方法:
function getbyclass(parent,classname){ var boxarr = new array();//用来获取所有class为box的元素 oelement = parent.getelementsbytagname('*'); for (var i = 0; i <oelement.length; i++) { if(oelement[i].classname == classname){ boxarr.push(oelement[i]); } }; return boxarr; }
两个参数分别是父元素和要查找的classname。
接下来写函数:
//首先在onload函数中调用函数 window.onload = function(){ waterfull('main','box'); } function waterfull(parent,children){ //先获得父元素及其底下所有的class = box的元素 var oparent = document.getelementbyid(parent); var oboxs = getbyclass(oparent,children); //我们在前面说过,数据块的列数我们是希望不变的。由于每个数据块都是等宽的,所以可以以第一个数据块的宽度为准,获得数据块的宽度。再计算数据块的列数,向下取整。 var oboxw = oboxs[0].offsetwidth; var cols = math.floor(document.documentelement.clientwidth/oboxw); 接下来设置父元素的样式,我们需要获得它的宽度,并且使其居中 oparent.style.csstext = 'width:' cols * oboxw + 'px; margin: 0 auto'; //在定义好了所有的样式之后,就是排列数据块。首先第一行是直接排列的。定义一个数组存放每一列的高度,从第二行开始,使得每一个数据块都排在高度最低的那一列。首先得遍历所有的box,即oboxs var arrh = []; //定义数组存放每一列的高度 for(var i = 0; i< oboxs.length; i++){ //当是第一行时,直接将数据块依次排列,并在数组中记录每一列的高度 if(i < cols){ arrh[i] = oboxs[i].offsetheight; } //当i>cols时,即要对前面的所有列的高度进行遍历,将下一个图片放在合适的位置。 else{ //首先在数组中找到高度最低的列数。我们都知道有math.min可以找到最小的数字,但是它接受的参数必须是一组数字,所以在这里我们要用math.min.apply()方法 var minh = math.min.apply(null, arrh); //定义一个变量,存放数组中最小的高度 //在找出了最小高度之后,我们需要知道它的索引,才能够为接下来的数据块找到合适的位置,所以在下面又定义了一个找出最小值下标的函数。 //定义一个变量去接受getminhindex函数的返回值 var minindex = getminhindex(arrh,minh); //在获得了高度最小的列数的索引后,就可以将下一个元素放到合适的位置 oboxs[i].style.position = 'absolute'; oboxs[i].style.top = minh + 'px'; oboxs[i].style.left = minindex * oboxw + 'px'; //将当前的数据块终于都放到了合适的位置,但不要忘了更新arrh数组 arrh[minindex] += oboxs[i].offsetheight; } } } //获取当前最小值得下标 function getminhindex(array,min){ for(var i in array){ if(array[i] == min) return i; } }
以上就是完整的瀑布流布局的js实现代码。效果图如下:
附上源代码:
js代码:
window.onload = function(){ waterfull('main','box'); } function waterfull(parent,children){ var oparent = document.getelementbyid(parent); //var oboxs = parent.queryselectorall(".box"); var oboxs = getbyclass(oparent,children); //计算整个页面显示的列数 var oboxw = oboxs[0].offsetwidth; var cols = math.floor(document.documentelement.clientwidth/oboxw); //设置main的宽度,并且居中 oparent.style.csstext = 'width:'+oboxw * cols +'px; margin: 0 auto'; //找出高度最小的图片,将下一个图片放在下面 //定义一个数组,存放每一列的高度,初始化存的是第一行的所有列的高度 var arrh = []; for(var i = 0; i< oboxs.length ; i++){ if(i < cols){ arrh.push(oboxs[i].offsetheight); } else{ var minh = math.min.apply(null,arrh); var minindex = getminhindex(arrh,minh); oboxs[i].style.position = 'absolute'; oboxs[i].style.top= minh + 'px'; oboxs[i].style.left = minindex * oboxw + 'px'; // oboxs[i].style.left = arrh[minindex].; arrh[minindex] += oboxs[i].offsetheight; } } } function getbyclass(parent,classname){ var boxarr = new array();//用来获取所有class为box的元素 oelement = parent.getelementsbytagname('*'); for (var i = 0; i <oelement.length; i++) { if(oelement[i].classname == classname){ boxarr.push(oelement[i]); } }; return boxarr; } //获取当前最小值得下标 function getminhindex(array,min){ for(var i in array){ if(array[i] == min) return i; } }
html以及css代码:
<!doctype html> <html> <head> <meta charset = "utf-8" /> <script src = "./jswaterfll.js"></script> <title>瀑布流布局</title> <style type="text/css"> *{ padding: 0px; margin: 0px; } #main{ position: relative; } .box{ /* display: inline-block;*/ padding: 15px 0px 0px 15px; float: left; } .pic{ padding: 10px; border-radius: 5px; border:1px solid #ccc; box-shadow: 0 0 5px #ccc; } .pic img{ width: 165px; height: auto; } </style> </head> <body> <div id = "main"> <div class = "box"> <div class = "pic"> <img src = "images/0.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/1.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/2.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/3.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/4.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/5.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/6.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/7.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/8.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/9.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/10.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/11.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/12.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/13.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/14.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/15.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/16.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/17.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/18.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/19.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/20.jpg"> </div> </div> <div class = "box"> <div class = "pic"> <img src = "images/21.jpg"> </div> </div> </div> </body> </html>
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。