AJAX implements data paging without refreshing-JS Tutorial-php.cn

AJAX implements data paging without refreshing

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Release： 2018-04-04 16:05:44

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This time I will bring you AJAX to implement non-refresh data paging, and what are the precautions for AJAX to implement non-refresh data paging. The following is a practical case, let's take a look.

I have used the GridView control before when using Asp.Net. This control has its own paging function. Although it is ugly, it is still very powerful. Here, I will show you a more powerful way - using AJAX to directly get data from the server for paging without refreshing.

1. Implementation process

Note: The following contents are all used within the server.

First, create several files in the server path, for example, page1.txt, page2.txt, page3.txt.

Put an array into each file, as follows:

[{user:'blue',pass:'123'},{user:'aaa',pass:'dsfaa'},{user:'Ares',pass:'12346'}]

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Figure 1 Contents of page one

Front-end HTML code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>AJAX实现分页、</title>
<script src="ajax.js"></script>
<script>
window.onload=function ()
{
  var oUl=document.getElementById('ul1');
  var aBtn=document.getElementsByTagName('a');
  var i=0;
  for(i=0;i<aBtn.length;i++)
  {
    //给每一个按钮附一个初值索引
    aBtn[i].index=i;
    aBtn[i].onclick=function ()
    {
      //调用AJAX函数
      ajax(&#39;page&#39;+(this.index+1)+&#39;.txt&#39;, function (str){
        //获得其中的数据
        var aData=eval(str);
        oUl.innerHTML=&#39;&#39;;
        for(i=0;i<aData.length;i++)
        {
          var oLi=document.createElement(&#39;li&#39;);
          oLi.innerHTML=&#39;<strong>'+aData[i].user+'</strong><i>'+aData[i].pass+'</i>';
          oUl.appendChild(oLi);
        }
      });
    };
  }
};
</script>
</head>
<body>
<ul id="ul1">
</ul>
<a href="javascript:;">1</a>
<a href="javascript:;">2</a>
<a href="javascript:;">3</a>
</body>
</html>

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Encapsulated AJAX, JavaScript code:

/*
AJAX封装函数
url：系统要读取文件的地址
fnSucc：一个函数，文件取过来，加载完会调用
*/
function ajax(url, fnSucc, fnFaild)
{
  //1.创建Ajax对象
  var oAjax=null;
  if(window.XMLHttpRequest)
  {
    oAjax=new XMLHttpRequest();
  }
  else
  {
    oAjax=new ActiveXObject("Microsoft.XMLHTTP");
  }
  //2.连接服务器
  oAjax.open('GET', url, true);
  //3.发送请求
  oAjax.send();
  //4.接收服务器的返回
  oAjax.onreadystatechange=function ()
  {
    if(oAjax.readyState==4) //完成
    {
      if(oAjax.status==200)  //成功
      {
        fnSucc(oAjax.responseText);
      }
      else
      {
        if(fnFaild)
          fnFaild(oAjax.status);
      }
    }
  };
}

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Final effect:

Figure 2 Display effect

2. Summary

AJAX still requires more attempts and more practice. Pagination is a good idea, it can improve the speed of access, it is a good method, and it will bring better benefits to everyone in the future.

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!