php+ajax实现输入读取数据库显示匹配信息_PHP

dropbox_index.php

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'] . "
";
         //echo "lastname:" . $row['LastName'] . "
";
         //echo "age:" . $row['Age'] . "
";
       }
       //echo $row['FirstName'] . "
";
     }
    mysql_close($con);
   }
?>

数据库：

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