javascript实现瀑布流自适应遇到的问题及解决方案

这几天看了Amy老师的用javascript实现瀑布流，我跟着把代码敲出来。发现这样写只能第一次载入时适应屏幕，以后改变窗口大小就不能做到自适应了。

于是我想到了用window.onresize来使得瀑布流函数从新加载来达到目的，

window.onload=function(){

    //瀑布流函数

    waterfall('content','box');

    //模拟数据加载

    var dataInt = {"data":[{"src":"01.jpg"},{"src":"02.jpg"},{"src":"03.jpg"},{"src":"04.jpg"},{"src":"05.jpg"},{"src":"06.jpg"},{"src":"07.jpg"}]}

    //当屏幕大小改变时从新执行瀑布流函数 达到从新适应的作用

    window.onresize=function(){

//      waterfall('content','box');

       setTimeout(function() {waterfall('content','box');}, 200);

    }

    window.onscroll=function(){

        if(checkScroll()){

            var oparent = document.getElementById('content');

            //将熏染的数据添加入html中

            for(var i=0;i<dataInt.data.length;i++){

                var obox = document.createElement("div");

                obox.className = "box";

                oparent.appendChild(obox);

                var opic = document.createElement("div");

                opic.className = "pic";

                obox.appendChild(opic);

                var oImg = document.createElement("img");

                oImg.src="img/"+dataInt.data[i].src;

                opic.appendChild(oImg);

            }

                waterfall('content','box');

        }

    }

}

当屏幕缩小时是可以的，但是从缩小的放大就出现了BUG

看没看到后面几列的顶部回不来了，
于是我打开开发工具看是怎么回事，

第3 4 5个div中不应该有style,是因为缩小的时候给他添加上去的，而放大了他没有清除所以保留下来了就会出现这个样子于是：我在瀑布流函数里加了句aBox[i].style.cssText ='';使得每次进来都清空style

复制代码代码如下:

function waterfall(parent,box){

    //将content下所有class box取出来

    var aParent = document.getElementById(parent);

    var aBox = getBclass(aParent,box);

    //获取盒子的宽度

    var aBoxW = aBox[0].offsetWidth;

    //用浏览器的可是宽度除以box宽度 得到列数

    var cols = Math.floor(document.documentElement.clientWidth/aBoxW);

    //设定 content的宽度 和居中

    aParent.style.cssText = 'width:'+aBoxW*cols+'px;height:auto;position: relative; margin:0 auto;padding-right:15px';

    //创建每一列的高度数组

    var hArr=[];

    for(var i=0; i<aBox.length;i++){

        aBox[i].style.cssText ='';

        if(i<cols){

            hArr.push(aBox[i].offsetHeight); 

        }else{

            var minH = Math.min.apply(null,hArr);

            var index = getMinIndex(hArr,minH);  //找出高最矮的 索引值

            //console.log(aBoxW);

            aBox[i].style.position = 'absolute';

            aBox[i].style.top = minH+'px';

            aBox[i].style.left = aBoxW*index+'px';

            hArr[index]+=aBox[i].offsetHeight;

        }

    }

}

这样就解决了缩小后回不来的BUG，可以正常自适应了

最后我把整个的javascript 贴出来

复制代码代码如下:

window.onload=function(){

    //瀑布流函数

    waterfall('content','box');

    //模拟数据加载

    var dataInt = {"data":[{"src":"01.jpg"},{"src":"02.jpg"},{"src":"03.jpg"},{"src":"04.jpg"},{"src":"05.jpg"},{"src":"06.jpg"},{"src":"07.jpg"}]}

    //当屏幕大小改变时从新执行瀑布流函数 达到从新适应的作用

    window.onresize=function(){

//      waterfall('content','box');

       setTimeout(function() {waterfall('content','box');}, 200);

    }

    window.onscroll=function(){

        if(checkScroll()){

            var oparent = document.getElementById('content');

            //将熏染的数据添加入html中

            for(var i=0;i<dataInt.data.length;i++){

                var obox = document.createElement("div");

                obox.className = "box";

                oparent.appendChild(obox);

                var opic = document.createElement("div");

                opic.className = "pic";

                obox.appendChild(opic);

                var oImg = document.createElement("img");

                oImg.src="img/"+dataInt.data[i].src;

                opic.appendChild(oImg);

            }

                waterfall('content','box');

        }

    }

}

function waterfall(parent,box){

    //将content下所有class box取出来

    var aParent = document.getElementById(parent);

    var aBox = getBclass(aParent,box);

    //获取盒子的宽度

    var aBoxW = aBox[0].offsetWidth;

    //用浏览器的可是宽度除以box宽度 得到列数

    var cols = Math.floor(document.documentElement.clientWidth/aBoxW);

    //设定 content的宽度 和居中

    aParent.style.cssText = 'width:'+aBoxW*cols+'px;height:auto;position: relative; margin:0 auto;padding-right:15px';

    //创建每一列的高度数组

    var hArr=[];

    for(var i=0; i<aBox.length;i++){

        aBox[i].style.cssText ='';

        if(i<cols){

            hArr.push(aBox[i].offsetHeight); 

        }else{

            var minH = Math.min.apply(null,hArr);

            var index = getMinIndex(hArr,minH);  //找出高最矮的 索引值

            //console.log(aBoxW);

            aBox[i].style.position = 'absolute';

            aBox[i].style.top = minH+'px';

            aBox[i].style.left = aBoxW*index+'px';

            hArr[index]+=aBox[i].offsetHeight;

        }

    }

}

//根据class获取到元素

function getBclass(parent,className){

    var boxarr = new Array(); //用来存储获取到的class

        //console.log(parent.prototype);

    allElement=parent.getElementsByTagName('*');

    for(var i=0;i<allElement.length;i++){

        if(allElement[i].className == className){

            boxarr.push(allElement[i]);

        }

    }

    return boxarr;

}

//找出高最矮的 索引值

function getMinIndex(arr,value){

    for(var i in arr){

        if (arr[i]==value){

            return i;

        }

    }

}

//建立一个检测轮轮滑动是否成立的函数  返回真假

function checkScroll(){

    var oparent = document.getElementById("content");

    var oBox = getBclass(oparent,'box');

    var lastoBoxTop = oBox[oBox.length-1].offsetTop+Math.floor(oBox[oBox.length-1].offsetHeight/2);

    //console.log(lastoBoxTop);

    var scrollTop = document.body.scrollTop||document.documentElement.scrollTop;

    var height = document.body.clientHeight||document.documentElement.clientHeight;

    //console.log(scrollTop);

    return(lastoBoxTop<scrollTop+height)?true:false;

}

css文件贴出来

复制代码代码如下:

*{margin: 0;padding: 0;}

body{background-color: #eee;}

.content{ 

    position: relative;

    }

.box{

    padding: 15px 0 0 15px;

    float: left;

}

.pic{

    padding: 10px;

    border: 1px solid #ccc;

    box-shadow: 0 0 5px #CCCCCC;

    border-radius: 5px;

    background: #fff;

}

.pic img{

    width: 220px;

    height: auto;

    border: 1px solid #eee;

}

html文件贴出来

复制代码代码如下:

<!DOCTYPE html>

<html>

    <head>

        <meta charset="utf-8" />

        <title>javascript瀑布流</title>

        <link rel="stylesheet" type="text/css" href="css/pubuli.css"/>

        <script type="text/javascript" src="js/my.js" ></script>

    </head>

    <body>

        <div id="content">

            <div class="box">

                <div class="pic">

                <img src="img/01.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/02.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/03.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/04.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/05.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/06.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/07.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/08.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/09.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/10.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/11.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/12.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/13.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/14.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/15.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/16.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/17.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/18.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/19.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/20.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/21.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/22.jpg"/> 

                </div>

            </div>

        </div>

    </body>

</html>

好了谢谢大家观看，以前没写过技术分享类文章，有很多不周到的地方希望大家能多多指正。学习前端的小菜鸟敬上Y(^_^)Y

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