Ajax+PHP+MySQL 登陆示例，
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2022-05-08 10:50:19
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Ajax+PHP+MySQL 登陆示例，
PHP是一门很好的语言,可以很方便的开发web应用程序,下面介绍一下PHP如何通过AJAX方式实现登录功能:
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:
1 php session_start();?>
2 DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
3 html xmlns="http://www.w3.org/1999/xhtml">
4 head>
5 meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
6 title>logintitle>
7 link rel="stylesheet" type="text/css" href="CSS/login.css" />
8 script src="JS/ajaxhelper.js" type="text/javascript">script>
9 script src="JS/jquery-1.3.2.min.js" type="text/javascript">script>
10 script type="text/javascript">
11 function chkForm() {
12 if (m$('username').value == "") {
13
14 alert('用户名不能为空.');
15 m$('username').focus();
16 return false;
17
18 }
19 if (m$('password').value == "") {
20
21 alert('密码不能为空.');
22 m$('password').focus();
23 return false;
24
25 }
26 if (m$('password').value != "" && m$('username').value != "") {
27
28 var xmlhttp = createRequest();
29 if (xmlhttp) {
30 m$('loading').innerHTML = "loading...";
31 var username = m$('username').value;
32 var pwd = m$('password').value;
33 var code = m$('txtCode').value;
34 var url = "dologin.php";
35 xmlhttp.open("POST", url, true);
36 xmlhttp.onreadystatechange = ValidateResult;
37 xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
38 xmlhttp.send("username=" + escape(username) + "&password=" + escape(pwd) + "&code=" + escape(code));
39
40 } else {
41 alert('xmlHttp创建失败.');
42
43 }
44
45 function ValidateResult() {
46 if (xmlhttp.readyState == 4) {
47 if (xmlhttp.status == 200) {
48 if (xmlhttp.responseText != "") {
49
50 //window.alert(xmlhttp.responseText);
51 var obj = eval("(" + xmlhttp.responseText + ")");
52 if (obj.result == true) {
53 alert("提示:" + obj.info);
54 window.location = 'index.php';
55
56 } else {
57 alert("错误:" + obj.info);
58
59 }
60 } else {
61 window.alert("从服务器获取失败");
62
63 window.location.reload();
64 }
65 m$('loading').innerHTML = "";
66 }
67 }
68
69 }
70
71
72 }
73
74 }
75
76 function m$(id) {
77 return document.getElementById(id);
78 }
79
80 function changeCode() {
81 var xmlhttp = createRequest();
82 if (xmlhttp) {
83 m$('loading').innerHTML = "loading...";
84 var dt = new Date().getTime();
85 // alert(dt);
86 var url = "function/imagecode.php?dummay" + escape(dt);
87 xmlhttp.open("GET", url, true);
88 xmlhttp.onreadystatechange = ValidateResult;
89 xmlhttp.send(null);
90
91 } else {
92 alert('xmlHttp创建失败.');
93
94 }
95
96 function ValidateResult() {
97 if (xmlhttp.readyState == 4) {
98 if (xmlhttp.status == 200) {
99 var dt = new Date().getTime();
100 var url = "function/imagecode.php?dummay" + escape(dt);
101 m$('imgCode').src = "function/imagecode.php?dummay" + escape(dt);
102 m$('loading').innerHTML = "";
103 }
104 }
105
106 }
107 }
108
109 function showTool() {
110 $('#divToolTip').css("display", "block");
111 }
112
113 function hideTool() {
114 $('#divToolTip').css("display", "none");
115 }
116 window.onload = initPage;
117
118 function initPage() {
119 $('#divToolTip').css("display", "none");
120 }
121 script>
122 head>
123 body>
124 div style="background-color:#2A3F55; height:80px;">
125
126 div>
127 div style="min-height:500px;">
128
129 div class="left">
130
131 div style="margin:120px auto auto auto; height:300px; text-align:left">
132 div style="font-size:26px;color:#2A3F55; text-align:center;">Ajax PHP Demo System
133 img src="Images/appstorm-icon.png" alt="appcation storm image" style="position:relative;top:-18px; left:-12px; vertical-align:middle; text-align:center;font-size:10px; width:65px; height:46px;"/>
134 div>
135 br/>
136 hr style="border:dashed thin #2A3F55;width:70%; text-align:center;"/>
137 div style="font-size:13px;color:#999999; margin:20px auto 0 auto; padding-left:200px;">
138 Author:a href="#" onmousemove="showTool();" onmouseout="hideTool();">wangminga>
139 div>
140 div style="font-size:13px;color:#999999;margin:20px auto auto auto; padding-left:200px;">DateTime:2009-9-1div>
141 div style="font-size:13px;color:#999999;margin:20px auto auto auto; padding-left:200px;">Version:1.0.0div>
142 div style="font-size:13px;color:#999999;margin:20px auto auto auto; padding-left:200px;">Email:wangmingemail@163.com div>
143 div id="divToolTip">
144 img src="Images/ming.jpg" height="86px;"/>
145 span class="authordes">
146 br/>
147 姓名:wangmingbr/>
148 电商06-2br/>
149 span>
150
151 div>
152
153 div>
154
155 div>
156
157 div class="right">
158
159 form>
160 br/>
161 table class="flogin">
162 tr>
163 td>用户名:td>
164 td>input type="text" name="username" id="username"/>td>
165 td>td>
166 tr>
167 tr>
168 td>密 码:td>
169 td>input type="password" name="password" id="password" />td>
170 td>td>
171 tr>
172 tr>
173 td>验证码:td>
174 td>
175 input type="text" name="txtCode" id="txtCode" size="12" />
176 img src="function/imagecode.php" id="imgCode" alt="image code" height="22px;" style=" vertical-align:bottom;"/>
177 td>
178 td>input type="button" class="btnrefresh" onclick="changeCode();" />td>
179 tr>
180 tr>
181 td>td>
182 td>input type="button" class="btnlogin" onclick="chkForm();" />td>
183 td>td>
184 tr>
185 tr>
186 td>td>
187 td>span id="loading">span>td>
188 td>span id="code">span>td>
189 tr>
190
191 table>
192 form>
193 div>
194
195 div>
196 div style="background-color:#2A3F55; height:60px; margin:auto 0 0 0; clear:both; text-align:center; line-height:60px; color:#FFFFFF;font-size:12px;">
197 ©Copyright 2015.
198 div>
199 body>
200 html>
2 ajaxhelper.js
1 function createRequest() {
2 try {
3 request = new XMLHttpRequest();
4 } catch (tryMS) {
5 try {
6 request = new ActiveXObject("Msxml2.XMLHTTP");
7 } catch (otherMS) {
8 try {
9 request = new ActiveXObject("Microsoft.XMLHTTP");
10 } catch (failed) {
11 request = null;
12 }
13 }
14 }
15 return request;
16 }
17
18 function getActivatedObject(e) {
19 var obj;
20 if (!e) {
21 // early version of IE
22 obj = window.event.srcElement;
23 } else if (e.srcElement) {
24 // IE 7 or later
25 obj = e.srcElement;
26 } else {
27 // DOM Level 2 browser
28 obj = e.target;
29 }
30 return obj;
31 }
32
33 function addEventHandler(obj, eventName, handler) {
34 if (document.attachEvent) {
35 obj.attachEvent("on" + eventName, handler);
36 } else if (document.addEventListener) {
37 obj.addEventListener(eventName, handler, false);
38 }
39 }
3 dologin.php
1 php
2 session_start();
3 header("Content-type:text/html;charset=gb2312");//防止返回的中文乱码
4 $name=$_POST['username'];
5 $pwd=$_POST['password'];
6 $imagecode=$_POST['code'];
7 if(strtoupper($imagecode)==$_SESSION["code"])
8 {
9 include("conn/conn.php");
10 $sql="select studentName,studentPwd from tbstudent where studentId='".$name."'";
11 $result=mysql_query($sql,$conn);
12 if($row=mysql_fetch_assoc($result))
13 {
14 if($pwd==$row['studentPwd'])
15 {
16 $_SESSION['username']=$row['studentName'];
17 //echo "{'result':true,'info':'登陆成功!','code':'".$_SESSION["code"]."'}";
18 echo "{'result':true,'info':'登陆成功!'}";
19
20 }
21 else
22 {
23 echo "{'result':false,'info':'密码错误!'}";
24 }
25 }
26 else
27 {
28 echo "{'result':false,'info':'该用户不存在!'}";
29 }
30 }
31 else
32 {
33 echo "{'result':false,'info':'验证码错误!'}";
34 }
35 ?>
4 conn.php
1 php
2 $conn=$mysql_connect("localhost","root", "");
3 mysql_select_db("bbs",$conn);
4 mysql_query("SET NAMES GB2312");
5 ?>
5 user.php
1 php 2 class Users { 3 function Users() { 4 } 5 function checkLogin($username, $userpwd) { 6 try { 7 mysql_connect("localhost", "root", "123"); 8 mysql_select_db("studentdb"); 9 mysql_query("SET NAMES GB2312"); 10 $sql = "select userid from tbuser where username='$username' and userpwd='" . md5(trim($userpwd)) . "'"; 11 $result = mysql_query($sql); 12 if ($result) { 13 $arr = mysql_fetch_row($result); 14 $uid = $arr[0]; 15 if ($uid != "") { 16 return "true|$uid login ok.$sql"; 17 mysql_close(); 18 } else { 19 return "false|login failed!$sql"; 20 mysql_close(); 21 } 22 } else { 23 return "false|$result link db failed!"; 24 mysql_close(); 25 } 26 } 27 catch(Exception $ex) { 28 return "false|$ex"; 29 mysql_close(); 30 } 31 } 32 function AddUser($name, $pwd) { 33 try { 34 mysql_connect("localhost", "root", "123"); 35 mysql_select_db("studentdb"); 36 mysql_query("set names gb2312"); 37 $sql0 = mysql_query("select userid from tbuser where username='$name'"); 38 $info0 = mysql_fetch_array($sql0); 39 $userid = $info0[0]; 40 if ($info0 != false) { 41 return "false | $name is exisis.(id:$userid)"; 42 } 43 $pwd = md5(trim($pwd)); 44 $query = mysql_query("insert into tbuser(username,userpwd)values('$name','$pwd')"); 45 $error = mysql_errno(); 46 if ($query) { 47 return "true | add ok"; 48 } else { 49 return "false | $error"; 50 } 51 } 52 catch(Exception $ex) { 53 return "false | $ex"; 54 } 55 } 56 function DeleteUser($name) { 57 mysql_connect("localhost", "root", "123"); 58 mysql_select_db("studentdb"); 59 mysql_query("set names gb2312"); 60 $name = trim($name); 61 $sql0 = mysql_query("select userid from tbuser where username='$name'"); 62 $info0 = mysql_fetch_array($sql0); 63 if ($info0 != false) { 64 if (mysql_query("delete from tbuser where username='$name'")) { 65 return "true | delete ok.(id:" . $info0[0] . ")"; 66 } else { 67 return "false | 删除失败"; 68 } 69 } else { 70 return "false | 删除失败 $name 不存在"; 71 } 72 } 73 function UpdateUser($id, $name, $pwd) { 74 if (is_numeric(intval(trim($id)))) { 75 if ($id && $name && $pwd) { 76 mysql_connect("localhost", "root", "123"); 77 mysql_select_db("studentdb"); 78 mysql_query("set names gb2312"); 79 $pwd = md5(trim($pwd)); 80 $isexists = mysql_query("select * from tbuser where userid='$id'"); 81 if (mysql_fetch_array($isexists)) { 82 $sql0 = mysql_query("update tbuser set username='$name',userpwd='$pwd' where userid= $id"); 83 if ($sql0) { 84 return "ture | update ok"; 85 } else { 86 return "false | 更新失败"; 87 } 88 } else { 89 return "false | usrid=$id not exists."; 90 } 91 } else { 92 return "false |id=$id name=$name and pwd=$pwd .At least one of them is null."; 93 } 94 } else { 95 return "false | $id is not type of int."; 96 } 97 } 98 } 99 ?> View Code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.
6 效果图
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