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這篇文章將為大家詳細(xì)講解有關(guān)JavaScript如何實(shí)現(xiàn)瀑布流布局,小編覺得挺實(shí)用的,因此分享給大家做個(gè)參考,希望大家閱讀完這篇文章后可以有所收獲。
就是一堆等寬不等高的數(shù)據(jù)塊組成的頁面,如圖:
現(xiàn)在好多網(wǎng)站都采用這種瀑布流布局,如蘑菇街。美麗說等等。
首先要實(shí)現(xiàn)它就要明白它是怎樣排列的。
每一行的列數(shù)都是根據(jù)圖片的寬度和頁面的寬度算比例算下來的。。
第一行就是按順序排列,其他的數(shù)據(jù)塊都是在每一列中挑選出最低的那一列依次排進(jìn)去的。
首先實(shí)現(xiàn)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>
這里定義了14個(gè)圖片,每個(gè)圖片都被一個(gè)class= box的屬性和class= “pic”的屬性包裹,在css中定義其樣式:
*{ 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>
效果圖如下:
其實(shí)每一行六個(gè)圖片不是固定的,當(dāng)你縮小窗口時(shí),它會(huì)成為兩列,或者三列四列。但我們?yōu)榱艘院蟮牟季?,就將它設(shè)置為固定的列數(shù),即根據(jù)窗口的大小除以圖片的大小,向下取整。
接下來寫的是js實(shí)現(xiàn)的瀑布流布局。
在寫代碼之前,由于要用到box屬性,而js中沒有直接定義獲得class的方法,所以我們?cè)谶@兒要寫一個(gè)獲得class的方法:
function getByClass(parent,className){ var boxArr = new Array();//用來獲取所有class為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; }
兩個(gè)參數(shù)分別是父元素和要查找的classname。
接下來寫函數(shù):
//首先在onload函數(shù)中調(diào)用函數(shù) window.onload = function(){ waterFull('main','box'); } function waterFull(parent,children){ //先獲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); //我們?cè)谇懊嬲f過,數(shù)據(jù)塊的列數(shù)我們是希望不變的。由于每個(gè)數(shù)據(jù)塊都是等寬的,所以可以以第一個(gè)數(shù)據(jù)塊的寬度為準(zhǔn),獲得數(shù)據(jù)塊的寬度。再計(jì)算數(shù)據(jù)塊的列數(shù),向下取整。 var oBoxW = oBoxs[0].offsetWidth; var cols = Math.floor(document.documentElement.clientWidth/oBoxW); 接下來設(shè)置父元素的樣式,我們需要獲得它的寬度,并且使其居中 oParent.style.cssText = 'width:' cols * oBoxW + 'px; margin: 0 auto'; //在定義好了所有的樣式之后,就是排列數(shù)據(jù)塊。首先第一行是直接排列的。定義一個(gè)數(shù)組存放每一列的高度,從第二行開始,使得每一個(gè)數(shù)據(jù)塊都排在高度最低的那一列。首先得遍歷所有的box,即oBoxs var arrH = []; //定義數(shù)組存放每一列的高度 for(var i = 0; i< oBoxs.length; i++){ //當(dāng)是第一行時(shí),直接將數(shù)據(jù)塊依次排列,并在數(shù)組中記錄每一列的高度 if(i < cols){ arrH[i] = oBoxs[i].offsetHeight; } //當(dāng)i>cols時(shí),即要對(duì)前面的所有列的高度進(jìn)行遍歷,將下一個(gè)圖片放在合適的位置。 else{ //首先在數(shù)組中找到高度最低的列數(shù)。我們都知道有Math.min可以找到最小的數(shù)字,但是它接受的參數(shù)必須是一組數(shù)字,所以在這里我們要用Math.min.apply()方法 var minH = Math.min.apply(null, arrH); //定義一個(gè)變量,存放數(shù)組中最小的高度 //在找出了最小高度之后,我們需要知道它的索引,才能夠?yàn)榻酉聛淼臄?shù)據(jù)塊找到合適的位置,所以在下面又定義了一個(gè)找出最小值下標(biāo)的函數(shù)。 //定義一個(gè)變量去接受getMinhIndex函數(shù)的返回值 var minIndex = getMinhIndex(arrH,minH); //在獲得了高度最小的列數(shù)的索引后,就可以將下一個(gè)元素放到合適的位置 oBoxs[i].style.position = 'absolute'; oBoxs[i].style.top = minH + 'px'; oBoxs[i].style.left = minIndex * oBoxW + 'px'; //將當(dāng)前的數(shù)據(jù)塊終于都放到了合適的位置,但不要忘了更新arrH數(shù)組 arrH[minIndex] += oBoxs[i].offsetHeight; } } } //獲取當(dāng)前最小值得下標(biāo) 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實(shí)現(xiàn)代碼。效果圖如下:
附上源代碼:
js代碼:
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); //計(jì)算整個(gè)頁面顯示的列數(shù) var oBoxW = oBoxs[0].offsetWidth; var cols = Math.floor(document.documentElement.clientWidth/oBoxW); //設(shè)置main的寬度,并且居中 oParent.style.cssText = 'width:'+oBoxW * cols +'px; margin: 0 auto'; //找出高度最小的圖片,將下一個(gè)圖片放在下面 //定義一個(gè)數(shù)組,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();//用來獲取所有class為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; } //獲取當(dāng)前最小值得下標(biāo) function getMinhIndex(array,min){ for(var i in array){ if(array[i] == min) return i; } }
html以及css代碼:
<!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>
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