簡單瀑布流代碼實現javascript
html代碼例如如下css
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <script type="text/javascript" src="js/waterfall.js"/></script> <title>瀑布流-zhangzhang</title> <style type="text/css"> *{padding: 0;margin:0;} #main{ position: relative; } .pin{ padding: 15px 0 0 15px; float:left; } .box{ padding: 10px; border:1px solid #ccc; box-shadow: 0 0 6px #ccc; border-radius: 5px; } .box img{ width:162px; height:auto; } </style> </head> <body> <div id="main"> <div class="pin"> <div class="box"> <img src="./images/1.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/2.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/3.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/4.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/1.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/2.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/3.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/4.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/5.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/1.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/2.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/3.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/4.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/1.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/2.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/3.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/4.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/5.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/1.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/2.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/3.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/5.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/1.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/2.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/3.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/5.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/1.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/2.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/3.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/5.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/1.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/2.jpg"/> </div> </div> <div class="pin"> <div class="box"> <img src="./images/3.jpg"/> </div> </div> </div> </body> </html>
window.onload=function(){ waterfall('main','pin'); var dataInt={'data':[{'src':'1.jpg'},{'src':'2.jpg'},{'src':'3.jpg'},{'src':'4.jpg'}]}; window.onscroll=function(){ if(checkscrollside()){ var oParent = document.getElementById('main');// 父級對象 for(var i=0;i<dataInt.data.length;i++){ var oPin=document.createElement('div'); //加入 元素節點 oPin.className='pin'; //加入 類名 name屬性 oParent.appendChild(oPin); //加入 子節點 var oBox=document.createElement('div'); oBox.className='box'; oPin.appendChild(oBox); var oImg=document.createElement('img'); oImg.src='./images/'+dataInt.data[i].src; oBox.appendChild(oImg); } waterfall('main','pin'); }; } } /* parend 父級id pin 元素id */ function waterfall(parent,pin){ var oParent=document.getElementById(parent);// 父級對象 var aPin=getClassObj(oParent,pin);// 獲取存儲塊框pin的數組aPin var iPinW=aPin[0].offsetWidth;// 一個塊框pin的寬 var num=Math.floor(document.documentElement.clientWidth/iPinW);//每行中能容納的pin個數【窗體寬度除以一個塊框寬度】 oParent.style.cssText='width:'+iPinW*num+'px;margin:0 auto;';//設置父級居中樣式:定寬+本身主動水平外邊距 var pinHArr=[];//用於存儲 每列中的所有塊框相加的高度。 for(var i=0;i<aPin.length;i++){//遍歷數組aPin的每個塊框元素 var pinH=aPin[i].offsetHeight; if(i<num){ pinHArr[i]=pinH; //第一行中的num個塊框pin 先加入進數組pinHArr }else{ var minH=Math.min.apply(null,pinHArr);//數組pinHArr中的最小值minH var minHIndex=getminHIndex(pinHArr,minH); aPin[i].style.position='absolute';//設置絕對位移 aPin[i].style.top=minH+'px'; aPin[i].style.left=aPin[minHIndex].offsetLeft+'px'; //數組 最小高元素的高 + 加入上的aPin[i]塊框高 pinHArr[minHIndex]+=aPin[i].offsetHeight;//更新加入了塊框後的列高 } } } /**** *經過父級和子元素的class類 獲取該同類子元素的數組 */ function getClassObj(parent,className){ var obj=parent.getElementsByTagName('*');//獲取 父級的所有子集 var pinS=[];//建立一個數組 用於收集子元素 for (var i=0;i<obj.length;i++) {//遍歷子元素、推斷類別、壓入數組 if (obj[i].className==className){ pinS.push(obj[i]); } }; return pinS; } /**** *獲取 pin高度 最小值的索引index */ function getminHIndex(arr,minH){ for(var i in arr){ if(arr[i]==minH){ return i; } } } function checkscrollside(){ var oParent=document.getElementById('main'); var aPin=getClassObj(oParent,'pin'); //建立【觸發加入塊框函數waterfall()】的高度:最後一個塊框的距離網頁頂部+自身高的一半(實現未滾究竟就開始載入) var lastPinH=aPin[aPin.length-1].offsetTop+Math.floor(aPin[aPin.length-1].offsetHeight/2); var scrollTop=document.documentElement.scrollTop||document.body.scrollTop;//注意解決兼容性 var documentH=document.documentElement.clientHeight;//頁面高度 return (lastPinH<scrollTop+documentH)?true:false;//到達指定高度後 返回true。觸發waterfall()函數 }