在PHP中应用AJAX技术检测用户名是否重复

来源：互联网发布：数据库实用教程下载编辑：程序博客网时间：2024/06/05 11:27

<html><head><title>在PHP中应用AJAX技术检测用户名</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><style type="text/css"><!--body {margin-bottom: 0px;background-color: #64284A;}td{font-size:12px;}# style5 {font-family: "文鼎淹水体";font-size: 18pt;color: #64284A;}# style2 {font-size: 16px; font-family: "文鼎霹雳体"; color: #64284A;}# style3 {font-family: "文鼎圆立体"}# style4 {font-family: "文鼎淹水体"}--></style></head><body><script language="javascript">var http_request = false;function createRequest(url) {//初始化对象并发出XMLHttpRequest请求http_request = false;if (window.XMLHttpRequest) { //Mozilla等其他浏览器http_request = new XMLHttpRequest();if (http_request.overrideMimeType) {http_request.overrideMimeType("text/xml");}} else if (window.ActiveXObject) { //IE浏览器try {http_request = new ActiveXObject("Msxml2.XMLHTTP");} catch (e) {try {http_request = new ActiveXObject("Microsoft.XMLHTTP");   } catch (e) {}}}if (!http_request) {alert("不能创建XMLHTTP实例!");return false;}http_request.onreadystatechange = alertContents;    //指定响应方法http_request.open("GET", url, true); //发出HTTP请求http_request.send(null);}function alertContents() {    //处理服务器返回的信息if (http_request.readyState == 4) {if (http_request.status == 200) {alert(http_request.responseText);} else {alert('您请求的页面发现错误');}}}</script><script language="javascript">function checkName() {var username = form1.username.value;if(username=="") {window.alert("请填写用户名!");form1.username.focus();return false;}else {createRequest('checkname.php?username='+username+'&nocache='+new Date().getTime());}}</script><form name="form1" method="post" action="">  <table width="1003" height="628" border="0" align="center" cellpadding="0" cellspacing="0">    <tr>      <td valign="top" background="images/bg.JPG"><table width="1003" border="0" cellspacing="0" cellpadding="0">          <tr>            <td width="242" height="346"> </td>            <td width="532" height="30" align="center" valign="bottom" class="style5"><span class="style2">用户注册<span class="style3"> <span class="style4"></span></span></span></td>            <td width="229"> </td>          </tr>          <tr>            <td> </td>            <td align="center"><table width="92%"  border="0" cellpadding="0" cellspacing="0">                <tr>                  <td width="29%" height="30" align="center">用 户 名：</td>                  <td width="71%" height="24"><input name="username" type="text" id="username" size="20">                      <a href="#" onClick="checkName();">[检测用户名]</a> </td>                </tr>                <tr>                  <td height="24" align="center">真实姓名：</td>                  <td height="24"><input name="truename" type="text" id="truename" size="20">                  *</td>                </tr>                <tr>                  <td height="24" align="center">密    码：</td>                  <td height="24"><input name="pwd1" type="password" id="pwd1" size="20">                  *</td>                </tr>                <tr>                  <td height="24" align="center">确认密码：</td>                  <td height="24"><input name="pwd2" type="password" id="pwd2" size="20">                  * </td>                </tr>                <tr>                  <td height="24" align="center">性    别：</td>                  <td height="24"><input name="sex" type="radio" value="男" checked>                  男                    <input type="radio" name="sex" value="女">                  女</td>                </tr>                <tr>                  <td height="24" align="center" style="padding-left:10px">Email：</td>                  <td height="24" class="word_grey"><input name="email" type="text" id="email" size="28">                  *</td>                </tr>                <tr>                  <td height="24" align="center">个人主页：</td>                  <td height="24" class="word_grey"><input name="homepage" type="text" id="homepage" size="28"></td>                </tr>                <tr>                  <td height="40" colspan="2">                                      <input name="imageField" type="image" src="images/submit.gif" width="64" height="20" border="0">                   <input name="imageField2" type="image" src="images/reset.gif" width="64" height="20" border="0"></td>                </tr>            </table></td>            <td> </td>          </tr>      </table></td>    </tr>  </table></form></body></html>

php文件

<?phpheader('Content-type: text/html;charset=GB2312');//指定发送数据的编码格式为GB2312$link=mysql_connect("localhost","root","root");mysql_select_db("db_database23",$link);$GB2312string=iconv( 'UTF-8', 'gb2312//IGNORE' , $RequestAjaxString);//Ajax中先用encodeURIComponent对要提交的中文进行编码mysql_query("set names gb2312");$username=$_GET[username];$sql=mysql_query("select * from tb_user where name='".$username."'");$info=mysql_fetch_array($sql);if ($info){echo "很报歉!用户名[".$username."]已经被注册!";}else{echo "祝贺您!用户名[".$username."]没有被注册!";}?>

0 0