【下载文档:  PHP如何通过AJAX方式实现登录功能.txt 】

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PHP如何通过AJAX方式实现登录功能
本文实例讲述了Ajax+PHP+MySQL登陆示例。分享给大家供大家参考。具体如下：
运行效果截图如下：
具体代码如下：
1 login.php
登录界面中,javascript脚本用ajax方式异步请求dologin.php,dologin.php负责用户信息验证(包括验证码,php生成验证码可以自行搜索).登录界面的代码如下:

















2 ajaxhelper.js
function createRequest() {
try {
request = new XMLHttpRequest();
} catch (tryMS) {
try {
request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (otherMS) {
try {
request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (failed) {
request = null;
}
}
}
return request;
}
function getActivatedObject(e) {
var obj;
if (!e) {
// early version of IE
obj = window.event.srcElement;
} else if (e.srcElement) {
// IE 7 or later
obj = e.srcElement;
} else {
// DOM Level 2 browser
obj = e.target;
}
return obj;
}
function addEventHandler(obj, eventName, handler) {
if (document.attachEvent) {
obj.attachEvent("on" + eventName, handler);
} else if (document.addEventListener) {
obj.addEventListener(eventName, handler, false);
}
}
3 dologin.php
session_start();
header("Content-type:text/html;charset=gb2312");//防止返回的中文乱码
$name=$_POST['username'];
$pwd=$_POST['password'];
$imagecode=$_POST['code'];
if(strtoupper($imagecode)==$_SESSION["code"])
{
include("conn/conn.php");
$sql="select studentName,studentPwd from tbstudent where studentId='".$name."'";
$result=mysql_query($sql,$conn);
if($row=mysql_fetch_assoc($result))
{
if($pwd==$row['studentPwd'])
{
$_SESSION['username']=$row['studentName'];
//echo "{'result':true,'info':'登陆成功!','code':'".$_SESSION["code"]."'}";
echo "{'result':true,'info':'登陆成功!'}";
}
else
{
echo "{'result':false,'info':'密码错误!'}";
}
}
else
{
echo "{'result':false,'info':'该用户不存在!'}";
}
}
else
{
echo "{'result':false,'info':'验证码错误!'}";
}
?>
4 conn.php
$conn=$mysql_connect("localhost","root", "");
mysql_select_db("bbs",$conn);
mysql_query("SET NAMES GB2312");
?>
5
class Users {
function Users() {
}
function checkLogin($username, $userpwd) {
try {
mysql_connect("localhost", "root", "123");
mysql_select_db("studentdb");
mysql_query("SET NAMES GB2312");
$sql = "select userid from tbuser where username='$username' and userpwd='" . md5(trim($userpwd)) . "'";
$result = mysql_query($sql);
if ($result) {
$arr = mysql_fetch_row($result);
$uid = $arr[0];
if ($uid != "") {
return "true|$uid login ok.$sql";
mysql_close();
} else {
return "false|login failed!$sql";
mysql_close();
}
} else {
return "false|$result link db failed!";
mysql_close();
}
}
catch(Exception $ex) {
return "false|$ex";
mysql_close();
}
}
function AddUser($name, $pwd) {
try {
mysql_connect("localhost", "root", "123");
mysql_select_db("studentdb");
mysql_query("set names gb2312");
$sql0 = mysql_query("select userid from tbuser where username='$name'");
$info0 = mysql_fetch_array($sql0);
$userid = $info0[0];
if ($info0 != false) {
return "false | $name is exisis.(id:$userid)";
}
$pwd = md5(trim($pwd));
$query = mysql_query("insert into tbuser(username,userpwd)values('$name','$pwd')");
$error = mysql_errno();
if ($query) {
return "true | add ok";
} else {
return "false | $error";
}
}
catch(Exception $ex) {
return "false | $ex";
}
}
function DeleteUser($name) {
mysql_connect("localhost", "root", "123");
mysql_select_db("studentdb");
mysql_query("set names gb2312");
$name = trim($name);
$sql0 = mysql_query("select userid from tbuser where username='$name'");
$info0 = mysql_fetch_array($sql0);
if ($info0 != false) {
if (mysql_query("delete from tbuser where username='$name'")) {
return "true | delete ok.(id:" . $info0[0] . ")";
} else {
return "false | 删除失败";
}
} else {
return "false | 删除失败 $name 不存在";
}
}
function UpdateUser($id, $name, $pwd) {
if (is_numeric(intval(trim($id)))) {
if ($id && $name && $pwd) {
mysql_connect("localhost", "root", "123");
mysql_select_db("studentdb");
mysql_query("set names gb2312");
$pwd = md5(trim($pwd));
$isexists = mysql_query("select * from tbuser where userid='$id'");
if (mysql_fetch_array($isexists)) {
$sql0 = mysql_query("update tbuser set username='$name',userpwd='$pwd' where userid= $id");
if ($sql0) {
return "ture | update ok";
} else {
return "false | 更新失败";
}
} else {
return "false | usrid=$id not exists.";
}
} else {
return "false |id=$id name=$name and pwd=$pwd .At least one of them is null.";
}
} else {
return "false | $id is not type of int.";
}
}
}
?>
与登录无关，只为了记录一下PHP如何在数据库MYSQL上实现CURD操作.
以上就是告诉了大家PHP如何通过AJAX方式实现登录功能，希望对大家的学习有所帮助。