php随笔2-php+ajax 实现输入读取数据库显示匹配信息-PHP-Tutorial-php.cn

php随笔2-php+ajax 实现输入读取数据库显示匹配信息

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Freigeben： 2016-06-23 13:25:32

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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>

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dropbox.js

        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;        }

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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;}

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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);     }?>

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数据库：

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