JavaScript瀑布流布局实现代码

Iris ·
更新时间:2024-11-14
· 616 次阅读

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:

这里写图片描述

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>



流布局 布局 JavaScript

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