借占位符实现滚动到列表底部重新加载数据_html/css

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借占位符实现滚动到列表底部重新加载数据_html/css_WEB-ITnose

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Jun 21, 2016 am 08:50 AM

滚动到底部更新数据是个很常见的需求，也是网站优化的一部分。

页面效果

pic1.png

第一次滚动到底部新加载数据

pic2.png

再滚动

pic3.png

源代码

<!DOCTYPE html><html lang="en"><head>  <meta charset="UTF-8">  <title>Document</title>  <style>      li{width: 100px;height: 100px;background: #000;margin-bottom: 15px;color: #fff;text-align: center;}  </style>  <script src="./jquery.min.js"></script></head><body>  <ul class="ul-wrap">      <li>1</li>      <li>1</li>      <li>1</li>      <li>1</li>      <li>1</li>      <li>1</li>      <li>1</li>      <li>1</li>      <li>1</li>      <li>1</li>  </ul>  <div  id="loadInfo"></div>  <script>      function randomColor(){        var color="#";        var colorArr=["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"];        for(i=0;i<6;i++){            var cur=randomNum(15,0);            color+=colorArr[cur];        }        function randomNum(max,min){            return Math.floor(Math.random()*(max-min+1)+min)        }        return color;      }      //获取滚动高度、文档高度、浏览器视口高度      var heightFuns=function(){          //获取滚动高度          heightFuns.prototype.getScrollTop=function (){              var scrollTop=0,bodyScrollTop=0,documentScrollTop=0;              if(document.body){                  bodyScrollTop=document.body.scrollTop;              }              if(document.documentElement){                  documentScrollTop=document.documentElement.scrollTop;              }              scrollTop = (bodyScrollTop-documentScrollTop>0)?bodyScrollTop:documentScrollTop;              return scrollTop;          }          //获取文档的总高度          heightFuns.prototype.getScrollHeight=function (){              var scrollHeight=0,bodyScrollHeight=0,documentScrollHeight;              if(document.body){                  bodyScrollHeight=document.body.scrollHeight;              }              if(document.documentElement){                  documentScrollHeight=document.documentElement.scrollHeight;              }              scrollHeight=(bodyScrollHeight-documentScrollHeight>0)?bodyScrollHeight:documentScrollHeight;              return scrollHeight;          }          //获取浏览器视口的高度          heightFuns.prototype.getWindowHeight=function (){              var windowHeight=0;              if(document.compatMode == 'CSS1Compat'){                  windowHeight=document.documentElement.clientHeight;              }else{                  windowHeight=document.body.clientHeight;              }              return windowHeight;          }      }      function showData(){          $(".ul-wrap").append("<li>new</li>");          $("body").css("background",randomColor());          $("#loadInfo").html("");      }      $(function(){          var heightObj=new heightFuns();          window.onscroll=function(){              if(heightObj.getScrollTop()==heightObj.getScrollHeight()-heightObj.getWindowHeight()){                  // setTimeout(showData,1000);                  showData();                  $("#loadInfo").html("正在加载...");              }          }      });  </script></body></html>

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