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Native JS implements Ajax to interact with PHP through GET method

不言Original: 2018-06-01 09:51:161827browse

This article mainly introduces how native JS implements Ajax to interact with PHP through GET. It has a certain reference value. Now I share it with you. Friends in need can refer to it.

Examples of this article Use native JS to implement Ajax to interact with PHP through GET. Share it with everyone for your reference, the details are as follows:

1. Code

conn.php

<?php
   $conn=mysql_connect("localhost","root","root") or die("数据库连接失败".mysql_error());
   mysql_select_db("db_database27",$conn) or die("数据库连接失败".mysql_error());
   mysql_query("set names gb2312");
?>

index.php

<!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=gb2312" />
<title>通过XMLHttpRequest对象读取HTML文件，并且输出读取结果</title>
<style type="text/css">
<!--
body {
  margin-left: 0px;
  margin-top: 00px;
  margin-right: 0px;
  margin-bottom: 0px;
}
-->
</style></head>
<script>
var xmlHttp;        //定义XMLHttpRequest对象
function createXmlHttpRequestObject(){
  //如果在internet Explorer下运行
  if(window.ActiveXObject){
    try{
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }catch(e){
      xmlHttp=false;
    }
  }else{
  //如果在Mozilla或其他的浏览器下运行
    try{
      xmlHttp=new XMLHttpRequest();
    }catch(e){
      xmlHttp=false;
    }
  }
   //返回创建的对象或显示错误信息
  if(!xmlHttp)
    alert("返回创建的对象或显示错误信息");
    else
    return xmlHttp;
}
function showsimple(){
  createXmlHttpRequestObject();
  var cont = document.getElementById("searchtxt").value;
  if(cont==""){
    alert(&#39;查询关键字不能为空！&#39;);
    return false;
  }
    xmlHttp.onreadystatechange=StatHandler; //判断URL调用的状态值并处理
    xmlHttp.open("GET",&#39;searchrst.php?cont=&#39;+cont,false);
    xmlHttp.send(null);
}
function StatHandler(){
  if(xmlHttp.readyState==4 && xmlHttp.status==200){
    document.getElementById("webpage").innerHTML=xmlHttp.responseText;
  }
}
</script>
<body>
<table width="800" height="632" border="0" align="center" cellpadding="0" cellspacing="0" background="images/bj.jpg">
 <tr>
  <td width="260" height="245"> </td>
  <td width="500" align="center" valign="bottom"><strong>查询员工信息，根据员工技能信息</strong></td>
  <td width="40"> </td>
 </tr><form id="searchform" name="searchform" method="get" action="#">
 <tr>
  <td height="40"> </td>
  <td align="center">请输入关键字： <input name="searchtxt" type="text" id="searchtxt" size="30" />
    <input id="s_search" name="s_search" type="button" value="查询" onclick="return showsimple()" /></td>
  <td> </td>
 </tr> </form>
 <tr>
  <td height="268"> </td>
  <td align="center" valign="top"><p id="webpage"></p></td>
  <td> </td>
 </tr>
 <tr>
  <td> </td>
  <td> </td>
  <td> </td>
 </tr>
</table>
</body>
</html>

searchrst.php

<?php
header(&#39;Content-type: text/html;charset=GB2312&#39;);        //指定发送数据的编码格式
  include_once &#39;conn/conn.php&#39;;                //连接数据库
    $cont = $_GET[&#39;cont&#39;];                 //获取Ajax传递的查询关键字
    if(!empty($_GET[&#39;cont&#39;])){               //判断如果关键字不为空
      $sql = "select * from tb_administrator where explains like &#39;%".$cont."%&#39;"; //定义SQL语句
      $result=mysql_query($sql,$conn);          //执行模糊查询
      if(mysql_num_rows($result)>0){        //获取查询结果
        echo "<table width=&#39;500&#39; border=&#39;1&#39; cellpadding=&#39;1&#39; cellspacing=&#39;1&#39; bordercolor=&#39;#FFFFCC&#39; bgcolor=&#39;#666666&#39;>";
        echo "<tr><td height=&#39;30&#39; align=&#39;center&#39; bgcolor=&#39;#FFFFFF&#39;>ID</td><td align=&#39;center&#39; bgcolor=&#39;#FFFFFF&#39;>名称</td><td align=&#39;center&#39; bgcolor=&#39;#FFFFFF&#39;>编号</td><td align=&#39;center&#39; bgcolor=&#39;#FFFFFF&#39;>描述</td></tr>";
 while($myrow=mysql_fetch_array($result)){           //循环输出查询结果
 echo "<tr><td height=&#39;22&#39; bgcolor=&#39;#FFFFFF&#39;>".$myrow[id]."</td>";
 echo "<td bgcolor=&#39;#FFFFFF&#39;>".$myrow[user]."</td>";
  echo "<td bgcolor=&#39;#FFFFFF&#39;>".$myrow[number]."</td>";
echo "<td bgcolor=&#39;#FFFFFF&#39;>".$myrow[explains]."</td>";
echo "</tr>";
}
echo "</table>";
      }else{
      echo "没有符合条件的数据";
      }
    }
?>

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