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Ajax+PHP+MySQL 登陸示例，

編輯：關於PHP編程

Ajax+PHP+MySQL 登陸示例，

PHP是一門很好的語言,可以很方便的開發web應用程序,下面介紹一下PHP如何通過AJAX方式實現登錄功能:

1 login.php

登錄界面中,javascript腳本用ajax方式異步請求dologin.php,dologin.php負責用戶信息驗證(包括驗證碼,php生成驗證碼可以自行搜索).登錄界面的代碼如下:

  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>login</title>
  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$('username').value == "") {
 13 
 14                 alert('用戶名不能為空.');
 15                 m$('username').focus();
 16                 return false;
 17 
 18             }
 19             if (m$('password').value == "") {
 20 
 21                 alert('密碼不能為空.');
 22                 m$('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$('loading').innerHTML = "<font color='red'>loading...</font>";
 31                     var username = m$('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創建失敗.');
 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("錯誤:" + obj.info);
 58 
 59                                 }
 60                             } else {
 61                                 window.alert("從服務器獲取失敗");
 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$('loading').innerHTML = "<font color='red'>loading...</font>";
 84                 var dt = new Date().getTime();
 85                 // alert(dt);
 86                 var url = "function/imagecode.php?dummay" + escape(dt);
 87                 xmlhttp.open("GET", url, true);
 88                 xmlhttp.onreadystatechange = ValidateResult;
 89                 xmlhttp.send(null);
 90 
 91             } else {
 92                 alert('xmlHttp創建失敗.');
 93 
 94             }
 95 
 96             function ValidateResult() {
 97                 if (xmlhttp.readyState == 4) {
 98                     if (xmlhttp.status == 200) {
 99                         var dt = new Date().getTime();
100                         var url = "function/imagecode.php?dummay" + escape(dt);
101                         m$('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 >
125       
126     </div>
127     <div >
128       
129       <div class="left">
130         
131         <div >
132           <div >Ajax PHP Demo System
133             <img src="Images/appstorm-icon.png" alt="appcation storm image" />
134           </div>
135           <br/>
136           <hr />
137           <div >
138             Author:<a href="#" onmousemove="showTool();" onmouseout="hideTool();">wangming</a>
139           </div>
140           <div >DateTime:2009-9-1</div>
141           <div >Version:1.0.0</div>
142           <div >Email:[email protected]                   </div>
143           <div id="divToolTip">
144             <img src="Images/ming.jpg" height="86px;"/>
145             <span class="authordes">
146               <br/>
147               姓名:wangming<br/>
148               電商06-2<br/>
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>用戶名:</td>
164               <td><input type="text" name="username" id="username"/></td>
165               <td></td>
166             </tr>
167             <tr>
168               <td>密&nbsp;&nbsp;&nbsp;碼:</td>
169               <td><input type="password" name="password" id="password" /></td>
170               <td></td>
171             </tr>
172             <tr>
173               <td>驗證碼:</td>
174               <td>
175                 <input type="text" name="txtCode" id="txtCode" size="12" />&nbsp;
176                 <img src="function/imagecode.php" id="imgCode" alt="image code" height="22px;" />
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 >
197       &copy;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");//防止返回的中文亂碼
 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':'登陸成功!','code':'".$_SESSION["code"]."'}";
18             echo "{'result':true,'info':'登陸成功!'}";
19          
20          }
21          else
22          {
23             echo "{'result':false,'info':'密碼錯誤!'}";
24          }
25        }
26       else
27       {
28           echo "{'result':false,'info':'該用戶不存在!'}";
29       }
30    }
31    else
32    {
33        echo "{'result':false,'info':'驗證碼錯誤!'}";
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 | 刪除失敗"; 68 } 69 } else { 70 return "false | 刪除失敗 $name 不存在"; 71 } 72 } 73 function UpdateUser($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 | 更新失敗"; 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

與登錄無關,只為了記錄一下PHP如何在數據庫MYSQL上實現CURD操作.