php随笔2php+ajax 实现输入读取数据库显示匹配信息

dropbox_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>主搜索引擎下拉框自动显示数据</title>
</head>
<script src="js/dropbox.js"  type="text/javascript"></script>
<link  href="css/dropbox.css" type="text/css" rel="stylesheet"/>
<body>
<form action="" method="post" enctype="multipart/form-data">
                <input name="txt" id="txt" class="txt" type="text" onkeyup ="showHint(this.value)"  />        
                <input type="submit" class="btn" name="submit" value="Upload" /><br />
                <span id="txtHint" class="file-box"></span>
</form>
</body>
</html>

dropbox.js ajax

        var xmlHttp
        
        
        function showHint(str)
        {
            if (str.length==0)
            { 
              document.getElementById("txtHint").innerHTML=""
              return
            }
            xmlHttp=GetXmlHttpObject()
            if (xmlHttp==null)
              {
                  alert ("Browser does not support HTTP Request")
                  return
              } 
            var url="responsepage.php"
            url=url+"?q="+str
            url=url+"&sid="+Math.random()
            xmlHttp.onreadystatechange=stateChanged 
            xmlHttp.open("GET",url,true)
            xmlHttp.send(null)
        } 
        
        
        //设置回调函数
        function stateChanged() 
        { 
            if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
             { 
                document.getElementById("txtHint").innerHTML=xmlHttp.responseText 
             } 
        }
        
        
        function GetXmlHttpObject()
        {
            var xmlHttp=null;
            try
             {
                 // Firefox, Opera 8.0+, Safari
                 xmlHttp=new XMLHttpRequest();
            }
            catch (e)
            {
                 // Internet Explorer
                 try
                  {
                    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
                  }
                 catch (e)
                  {
                    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
                  }
             }
            return xmlHttp;
        }

dropbox.css

.txt{ height:22px; border:1px solid #cdcdcd; width:220px;border-right:none;} 
.btn{ background-color:#FFF; border:1px solid #CDCDCD;height:26px; width:70px;}

responsepage.php

<?php
    //get the q parameter from URL   
    $q=$_GET["q"];
    //全部小写化
    $q=strtolower($q);
    
    //非空验证
    if(isset($q) && $q != '')
    {
        $con = mysql_connect("localhost","root","lifu");
        if(!$con)
        {   
            die('Could not connect: ' .mysql_error());
        }
        mysql_select_db("my_db",$con);
        
        
        $sql = "select * from persons";
        //$sql="SELECT FirstName FROM  Persons where Firstname like  '%$q%'";
        
    
        $result =mysql_query($sql,$con);
        
        while($row = mysql_fetch_array($result))
         {
             
              //匹配判断
              if(stristr(strtolower($row['FirstName']),$q))
             {
                  //echo "-----------------Persons-----------------";
                 echo /* "firstname:" .*/ $row['FirstName'] . "<br />";
                 //echo "lastname:" . $row['LastName'] . "<br />";
                 //echo "age:" . $row['Age'] . "<br />";
              }
              
              //echo  $row['FirstName'] . "<br />";
              
         }
        mysql_close($con);
     }
?>

数据库：

结果：

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原文地址：https://www.cnblogs.com/GaoAnLee/p/4858799.html