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基于JavaScript实现瀑布流布局_javascript技巧

WBOY
WBOYasal
2016-05-16 15:20:121039semak imbas

本文实例讲解了原生JavaScript实现瀑布流布局详细代码，分享给大家供大家参考，具体内容如下

效果图：

具体代码：

HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <link rel="stylesheet" type="text/css" href="css/style.css">
  <script type="text/javascript" src="js/app.js"></script>
</head>
<body>
  <div id="container">
    <div class="box">
       <div class="box_img"> <img src="images/1.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/2.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/3.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/4.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/5.jpg" alt=""></div>
    </div>
  <div class="box">
       <div class="box_img"> <img src="images/6.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/7.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/8.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/9.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/10.jpg" alt=""></div>
    </div>

    <div class="box">
       <div class="box_img"> <img src="images/1.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/2.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/3.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/4.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/5.jpg" alt=""></div>
    </div>
  <div class="box">
       <div class="box_img"> <img src="images/6.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/7.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/8.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/9.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/10.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/1.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/2.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/3.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/4.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/5.jpg" alt=""></div>
    </div>
  <div class="box">
       <div class="box_img"> <img src="images/6.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/7.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/8.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/9.jpg" alt=""></div>
    </div>
    <div class="box">
       <div class="box_img"> <img src="images/10.jpg" alt=""></div>
    </div>


  </div>
</body>
</html>

CSS代码：

*{
   margin: 0px;
   padding: 0px;
}

#container{
   position: relative;
}

.box{
   padding: 5px;
   float: left;
}
.box_img{
   padding: 5px;
   border: 1px solid #cccccc;
   box-shadow: 0 0 5px #ccc;
   border-radius: 5px;
}

.box_img img{
   width: 150px;
   height:auto;
}

js代码：

window.onload=function(){
   imgLocation("container","box");
   var imgData={
     "data":[
       {"src":"2.jpg"},
       {"src":"3.jpg"},
       {"src":"4.jpg"},
       {"src":"5.jpg"},
       {"src":"6.jpg"},
       {"src":"7.jpg"},
       {"src":"8.jpg"},
     ]
   };
   window.onscroll=function(){
    if (checkFlag()) {
      var cparent=document.getElementById("container");
      for (var i = 0; i < imgData.data.length; i++) {
         var ccontent=document.createElement("div");
         ccontent.className="box";
         cparent.appendChild(ccontent);
         var boximg=document.createElement("div");
         boximg.className="box_img";
         ccontent.appendChild(boximg);
         var img=document.createElement("img");
         img.src="images/"+imgData.data[i].src;
         boximg.appendChild(img);
      } 
       imgLocation("container","box");
    }
   }
}

function checkFlag(){
   var cparent=document.getElementById("container");
   var ccontent=getChildnode(cparent,"box");
   var lastContentHeight=ccontent[ccontent.length-1].offsetTop;
   var scrollTop=document.documentElement.scrollTop||document.body.scrollTop;
   var pageHeight=document.documentElement.clientHeight||document.body.clientHeight;
   if (lastContentHeight<scrollTop+pageHeight) {
    return true;
   }
}
function imgLocation(parent,content){
     var cparent=document.getElementById(parent);
     var ccontent=getChildnode(cparent,content);
     var imgWidth=ccontent[0].offsetWidth;
     var cols=Math.floor(document.documentElement.clientWidth/imgWidth);
     cparent.style.cssText="width:"+imgWidth*cols+"px;margin:0 auto";

   //把第二排的左起第一张图片放到第一排高度最小的那张下面
     var imgHeightArr=[];
     for (var i = 0; i < ccontent.length; i++) {
        if (i<cols) {
            imgHeightArr[i]=ccontent[i].offsetHeight;          
        }else{
            var minHeight=Math.min.apply(null,imgHeightArr);
            var minHeightIndex=getMinHeightLoc(imgHeightArr,minHeight);
            console.log("minHeightIndex"+minHeightIndex);
      ccontent[i].style.position="absolute";
      ccontent[i].style.top=minHeight+"px";
      ccontent[i].style.left=ccontent[minHeightIndex].offsetLeft+"px";
      imgHeightArr[minHeightIndex]=imgHeightArr[minHeightIndex]+ccontent[i].offsetHeight;
        console.log(imgHeightArr[i]);
        console.log("高度最低:"+minHeight);
        }

    }

}

function getChildnode(parent,content){
   var contentArr=[];
   var allcontent=parent.getElementsByTagName("*");
  for (var i = 0; i < allcontent.length; i++) {
   if(allcontent[i].className==content){
      contentArr.push(allcontent[i]);
   }
  };

  return contentArr;
}

function getMinHeightLoc(imgHeightArr,minHeight){
   for(var i in imgHeightArr){
      if (imgHeightArr[i]==minHeight) {
       return i;
      }
   }
}

希望本文所述对大家学习javascript程序设计有所帮助。

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