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

Home

Backend Development

PHP Tutorial

php随笔2-php+ajax 实现输入读取数据库显示匹配信息

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Jun 23, 2016 pm 01:25 PM

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

        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：

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

PHP Performance Tuning for High Traffic WebsitesMay 14, 2025 am 12:13 AM

ThesecrettokeepingaPHP-poweredwebsiterunningsmoothlyunderheavyloadinvolvesseveralkeystrategies:1)ImplementopcodecachingwithOPcachetoreducescriptexecutiontime,2)UsedatabasequerycachingwithRedistolessendatabaseload,3)LeverageCDNslikeCloudflareforservin

Dependency Injection in PHP: Code Examples for BeginnersMay 14, 2025 am 12:08 AM

You should care about DependencyInjection(DI) because it makes your code clearer and easier to maintain. 1) DI makes it more modular by decoupling classes, 2) improves the convenience of testing and code flexibility, 3) Use DI containers to manage complex dependencies, but pay attention to performance impact and circular dependencies, 4) The best practice is to rely on abstract interfaces to achieve loose coupling.

PHP Performance: is it possible to optimize the application?May 14, 2025 am 12:04 AM

Yes,optimizingaPHPapplicationispossibleandessential.1)ImplementcachingusingAPCutoreducedatabaseload.2)Optimizedatabaseswithindexing,efficientqueries,andconnectionpooling.3)Enhancecodewithbuilt-infunctions,avoidingglobalvariables,andusingopcodecaching

PHP Performance Optimization: The Ultimate GuideMay 14, 2025 am 12:02 AM

ThekeystrategiestosignificantlyboostPHPapplicationperformanceare:1)UseopcodecachinglikeOPcachetoreduceexecutiontime,2)Optimizedatabaseinteractionswithpreparedstatementsandproperindexing,3)ConfigurewebserverslikeNginxwithPHP-FPMforbetterperformance,4)

PHP Dependency Injection Container: A Quick StartMay 13, 2025 am 12:11 AM

APHPDependencyInjectionContainerisatoolthatmanagesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itactsasacentralhubforcreatingandinjectingdependencies,thusreducingtightcouplingandeasingunittesting.

Dependency Injection vs. Service Locator in PHPMay 13, 2025 am 12:10 AM

Select DependencyInjection (DI) for large applications, ServiceLocator is suitable for small projects or prototypes. 1) DI improves the testability and modularity of the code through constructor injection. 2) ServiceLocator obtains services through center registration, which is convenient but may lead to an increase in code coupling.

PHP performance optimization strategies.May 13, 2025 am 12:06 AM

PHPapplicationscanbeoptimizedforspeedandefficiencyby:1)enablingopcacheinphp.ini,2)usingpreparedstatementswithPDOfordatabasequeries,3)replacingloopswitharray_filterandarray_mapfordataprocessing,4)configuringNginxasareverseproxy,5)implementingcachingwi

PHP Email Validation: Ensuring Emails Are Sent CorrectlyMay 13, 2025 am 12:06 AM

PHPemailvalidationinvolvesthreesteps:1)Formatvalidationusingregularexpressionstochecktheemailformat;2)DNSvalidationtoensurethedomainhasavalidMXrecord;3)SMTPvalidation,themostthoroughmethod,whichchecksifthemailboxexistsbyconnectingtotheSMTPserver.Impl

See all articles