javascript--瀑布流

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>

waterfallJS例如如下:

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
}
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