服务器之家：专注于服务器技术及软件下载分享
分类导航

PHP教程|ASP.NET教程|Java教程|ASP教程|编程技术|正则表达式|C/C++|IOS|C#|Swift|Android|VB|R语言|JavaScript|易语言|vb.net|

服务器之家 - 编程语言 - PHP教程 - PHP如何通过AJAX方式实现登录功能

PHP如何通过AJAX方式实现登录功能

2020-12-03 10:49JackWang-CUMT PHP教程

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Ajax+PHP+MySQL登陆示例，感兴趣的小伙伴们可以参考一下

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：

PHP如何通过AJAX方式实现登录功能

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:

 
?
1
 
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
<?php session_start();?>
<!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>login</title>
 <link rel="stylesheet" type="text/css" href="CSS/login.css" />
 <script src="JS/ajaxhelper.js" type="text/javascript"></script>
 <script src="JS/jquery-1.3.2.min.js" type="text/javascript"></script>
 <script type="text/javascript">
  function chkForm() {
   if (m$('username').value == "") {
 
    alert('用户名不能为空.');
    m$('username').focus();
    return false;
 
   }
   if (m$('password').value == "") {
 
    alert('密码不能为空.');
    m$('password').focus();
    return false;
 
   }
   if (m$('password').value != "" && m$('username').value != "") {
 
    var xmlhttp = createRequest();
    if (xmlhttp) {
     m$('loading').innerHTML = "<font color='red'>loading...</font>";
     var username = m$('username').value;
     var pwd = m$('password').value;
     var code = m$('txtCode').value;
     var url = "dologin.php";
     xmlhttp.open("POST", url, true);
     xmlhttp.onreadystatechange = ValidateResult;
     xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
     xmlhttp.send("username=" + escape(username) + "&password=" + escape(pwd) + "&code=" + escape(code));
 
    } else {
     alert('xmlHttp创建失败.');
 
    }
 
    function ValidateResult() {
     if (xmlhttp.readyState == 4) {
      if (xmlhttp.status == 200) {
       if (xmlhttp.responseText != "") {
 
        //window.alert(xmlhttp.responseText);
        var obj = eval("(" + xmlhttp.responseText + ")");
        if (obj.result == true) {
         alert("提示:" + obj.info);
         window.location = 'index.php';
 
        } else {
         alert("错误:" + obj.info);
 
        }
       } else {
        window.alert("从服务器获取失败");
 
        window.location.reload();
       }
       m$('loading').innerHTML = "";
      }
     }
 
    }
 
 
   }
 
  }
 
  function m$(id) {
   return document.getElementById(id);
  }
 
  function changeCode() {
   var xmlhttp = createRequest();
   if (xmlhttp) {
    m$('loading').innerHTML = "<font color='red'>loading...</font>";
    var dt = new Date().getTime();
    // alert(dt);
    var url = "function/imagecode.php?dummay" + escape(dt);
    xmlhttp.open("GET", url, true);
    xmlhttp.onreadystatechange = ValidateResult;
    xmlhttp.send(null);
 
   } else {
    alert('xmlHttp创建失败.');
 
   }
 
   function ValidateResult() {
    if (xmlhttp.readyState == 4) {
     if (xmlhttp.status == 200) {
      var dt = new Date().getTime();
      var url = "function/imagecode.php?dummay" + escape(dt);
      m$('imgCode').src = "function/imagecode.php?dummay" + escape(dt);
      m$('loading').innerHTML = "";
     }
    }
 
   }
  }
 
  function showTool() {
   $('#divToolTip').css("display", "block");
  }
 
  function hideTool() {
   $('#divToolTip').css("display", "none");
  }
  window.onload = initPage;
 
  function initPage() {
   $('#divToolTip').css("display", "none");
  }
 </script>
 </head>
 <body>
 <div style="background-color:#2A3F55; height:80px;">
  
 </div>
 <div style="min-height:500px;">
  
  <div class="left">
  
  <div style="margin:120px auto auto auto; height:300px; text-align:left">
   <div style="font-size:26px;color:#2A3F55; text-align:center;">Ajax PHP Demo System
   <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;"/>
   </div>
   <br/>
   <hr style="border:dashed thin #2A3F55;width:70%; text-align:center;"/>
   <div style="font-size:13px;color:#999999; margin:20px auto 0 auto; padding-left:200px;">
   Author:<a href="#" onmousemove="showTool();" onmouseout="hideTool();">wangming</a>
   </div>
   <div style="font-size:13px;color:#999999;margin:20px auto auto auto; padding-left:200px;">DateTime:2009-9-1</div>
   <div style="font-size:13px;color:#999999;margin:20px auto auto auto; padding-left:200px;">Version:1.0.0</div>
   <div style="font-size:13px;color:#999999;margin:20px auto auto auto; padding-left:200px;">Email:wangmingemail@163.com     </div>
   <div id="divToolTip">
   <img src="Images/ming.jpg" height="86px;"/>
   <span class="authordes">
    <br/>
    姓名:wangming<br/>
    电商06-2<br/>
   </span>
   
   </div>
   
  </div>
  
  </div>
  
  <div class="right">
  
  <form>
   <br/>
   <table class="flogin">
   <tr>
    <td>用户名:</td>
    <td><input type="text" name="username" id="username"/></td>
    <td></td>
   </tr>
   <tr>
    <td>密&nbsp;&nbsp;&nbsp;码:</td>
    <td><input type="password" name="password" id="password" /></td>
    <td></td>
   </tr>
   <tr>
    <td>验证码:</td>
    <td>
    <input type="text" name="txtCode" id="txtCode" size="12" />&nbsp;
    <img src="function/imagecode.php" id="imgCode" alt="image code" height="22px;" style=" vertical-align:bottom;"/>
    </td>
    <td><input type="button" class="btnrefresh" onclick="changeCode();" /></td>
   </tr>
   <tr>
    <td></td>
    <td><input type="button" class="btnlogin" onclick="chkForm();" /></td>
    <td></td>
   </tr>
   <tr>
    <td></td>
    <td><span id="loading"></span></td>
    <td><span id="code"></span></td>
   </tr>
   
   </table>
  </form>
  </div>
  
 </div>
 <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;">
  &copy;Copyright 2015.
 </div>
 </body>
</html>

2 ajaxhelper.js

 
?
1
 
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
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

 
?
1
 
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
<?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

 
?
1
 
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
<?php
 $conn=$mysql_connect("localhost","root", "");
 mysql_select_db("bbs",$conn);
 mysql_query("SET NAMES GB2312");
 ?>
 5
 <?php
class Users {
 function Users() {
 }
 function checkLogin($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。

  • PHP
  • 登录
  • ajax

    • 延伸 · 阅读

    精彩推荐
    最近更新
    编辑推荐
    阅读排行
    热门标签
    2021 　 2038 　 65279 　 100010 　 RFC1123 　 PHP数组 　 phpExcel 　 Excel 　 PDO 　 预处理 　 word 　 下载 　 PHP-FPM 　 优化 　 max_children 　 Zookeeper 　 PHP应用程序 　 int 　 intval 　 字符串 　 互相转换 　 json_decode 　 empty 　 cURL 　 Get 　 Post 　 iconv 　 时间戳 　 页面跳转 　 php服务器环境搭建 　
    © 2019-2023 服务器之家(www.zzvips.com) 版权所有关于我们联系我们版权申明网站地图