jQuery implements infinite scrolling effect code_jquery

The example in this article describes how jQuery can achieve infinite scrolling effect. Share it with everyone for your reference, the details are as follows:

This is an effect imitating Tencent’s meager results. The scroll bar can scroll infinitely offline and continuously obtain new data from the database without brushing.

<style type="text/css">
body{ font-family: "Trebuchet MS",verdana,arial;}
#loading{ display:none; font-weight:bold;color:#FF0000;}
p { padding:10px;}
</style>
<p id="loading">loading data... </p>
$(function(){
   var isOK=true;//记录上次访问是否已经结束，如果ajax也有线程就好了
   var scrollH=0;//判断是往上滚还是往下滚
   var intI=1;
  // loading层是固定在页脚的记录牌
   $(".loading").css({"right":"2","bottom":0});
   $(".loading")
   .ajaxStart(function(){
    isOK=false;//执行ajax的时候把isOK设置成false防止第一次没有执行完的情况下执行第二次易出错
    $("#loading2").show();
     })
   .ajaxStop(function(){
     isOK=true;
     $("#loading2").hide();
     })
  $(window).scroll(function(){
   //控制load层
   document.getElementByIdx_x_x("loading").style.top=document.documentElement.scrollTop+"px";
    //触法ajax条件 可以换算成百分比更好
  if($(document).height()-$(window).scrollTop()-document.documentElement.clientHeight<240）{
   //当前位置比上次的小就是往上滚动不要执行ajax代码块
   if(scrollH>document.documentElement.scrollTopY)
   {
    $(".loading").append("<br/>向上滚不执行")
    scrollH=document.documentElement.scrollTop;//记录新位置
    return;
    }
   if(isOK)//如果是第一次或者上次执行完成了就执行本次
   {
     scrollH=document.documentElement.scrollTop;//记录新位置
     $(".loading").append("<br/>~~<span style='background:#red'>执行了ajax。。。。。</span><br/>")
     isOK=false;
   $.ajax({
     type:"POST",
     dataType: 'xml',
     url:"http://localhost:49302/MY100/2010/WebService1.asmx/getDS",
     error:function(e){
      $(".main").append('发生了错误：'+e)
      },
     success:function(data){
      try{
      $(data).find("Table").each(function(i){
         $(".main").append("结果："+$(this).children('txtTitle').text()+"<br/>");
         $(".main").append("结果："+$(this).children('txtBody1').text()+"<br/>");
         $(".main").append("结果："+$(this).children('txtBody2').text()+"<br/>");
         $(".main").append("结果："+$(this).children('txtBody3').text()+"<br/>");
         $(".main").append("结果："+$(this).children('txtBody4').text()+"<br/>");
         $(".main").append("结果："+$(this).children('ID').text()+"<br/>");
         })//each
      }
      catch(e){
       $(".main").append("<p>"+e+"</p>")
      }
      }//success
     })//ajax
     }//if(isOK)
     else
     {
      $(".loading").append("<br/>~~你是向下滚了，但是上次还没有执行完毕，等等吧<br/>")
     }
   }// 触法ajax条件
   })//scroll
})//Jquery 结束处

Readers who are interested in more jQuery related content can check out the special topics on this site: "JQuery switching effects and techniques summary", "jQuery drag effects and techniques summary", "JQuery extension skills summary", "jQuery common classic special effects summary", "jQuery animation and special effects usage summary", "jquery selector usage Summary " and "Summary of jQuery common plug-ins and usage "

I hope this article will be helpful to everyone in jQuery programming.