Detailed explanation of Ajax method to achieve beautiful and secure login interface

The login interface is an essential function provided by the information system and is an interface that provides users with maintenance information. Next, I will lead you to create a beautiful and secure login interface. The technology used is ASP.NET+jQuery. This article mainly introduces in detail the Ajax method to implement a beautiful and secure login interface, which has certain reference value. Interested friends can refer to it.

Let’s take a look at the preview first

Ajax login focuses on Ajax. After entering the user name and password, use Ajax to submit the information to the server. The server The terminal determines that the user exists. If it exists, the login is successful and the user is redirected to the management interface (sometimes it is necessary to write cookies or use Session, which will not be discussed here). If it does not exist, it will prompt a login failure.

Basic flow chartAs follows

The above is the main idea. In order to create a secure login, we can use MD5 to pair the password before using ajax to transmit the password to the server. Encryption is performed. Of course, the encrypted string is also stored in the database. jQuery has such an MD5 encryption plug-in, which is very convenient to use.

If you know the process, you can easily implement it. The following are some main codes

Default.aspx: mainly provide hyperlinks, click on which will call thickbox and open the pop-up page.

<p style="margin-left:50px; margin-top:50px; ">
欢迎使用后台，
<a href="Login.htm?TB_iframe&height=180&width=350&modal=true" class="thickbox" id="myToolTip" title="点击登录，进入后台管理" >
点击登录！</a>
                
继续浏览前台，<a href="../Default.aspx">返回前台</a>

login.htm: The real login interface, responsible for login logic

<script type="text/javascript" src="js/jquery-1.3.2.js"></script>
<script type="text/javascript">
 $().ready(function () {
  $(&#39;#Login&#39;).click(function () {
   if ($(&#39;#username&#39;).val() == "" || $(&#39;#password&#39;).val() == "") {
    alert("用户名或密码不能为空！");
   }
   else {
    $.ajax({
     type: "POST",
     url: "Ajax/LoginHandler.ashx",
     data: "username=" + escape($(&#39;#username&#39;).val()) + "&password=" + escape($(&#39;#password&#39;).val()),
     beforeSend: function () {
      $("#loading").css("display", "block"); //点击登录后显示loading，隐藏输入框
      $("#login").css("display", "none");
     },
     success: function (msg) {
      $("#loading").hide(); //隐藏loading
      if (msg == "success") {
       //parent.tb_remove();
       parent.document.location.href = "admin.htm"; //如果登录成功则跳到管理界面
       parent.tb_remove();
      }
      if (msg == "fail") {
       alert("登录失败！");
      }
     },
     complete: function (data) {
      $("#loading").css("display", "none"); //点击登录后显示loading，隐藏输入框
      $("#login").css("display", "block");
     },
     error: function (XMLHttpRequest, textStatus, thrownError) {
     }
    });
   }
  });
 });
</script>
<p id="loading" style="text-align: center; display: none; padding-top: 10%">
 <img src="images/loadingajax.gif" alt="loading" />
</p>
<p id="login" style="text-align: center">
<p style="position:absolute; right:0; top:0"><img src="images/closebox.png" onclick="parent.tb_remove()" alt="点击关闭" style="cursor:pointer" /></p>
 <table border="0" cellpadding="3" cellspacing="3" style="margin: 0 auto;">
  <tr>
   <td style="text-align: right; padding: 10px">
    <label>
     用户名:</label>
   </td>
   <td>
    <input id="username" type="text" size="20" />
   </td>
  </tr>
  <tr>
   <td style="text-align: right; padding: 10px">
    <label>
     密码:</label>
   </td>
   <td>
    <input id="password" type="password" size="20" />
   </td>
  </tr>
  <tr align="right">
   <td colspan="2">
    <input type="submit" id="Login" value="  登 录  " style="margin-right: 50px"> 
    <input type="submit" id="LoginCancel" value="  取 消  " onclick="parent.tb_remove()">
   </td>
  </tr>
 </table>
</p>

LoginHandler.ashx: ajax processing Class, simple logic

string username = context.Request["username"].ToString();
string password = context.Request["password"].ToString();
//context.Response.Write(password);如果使用加密，则写入数据库要加密后的字段，然后登陆的时候就用加密后的字符串匹配
//此处连接数据库查看是否有此用户，此处为了方便起见，直接判断
if (username == "admin" && password == "1")
 {
 context.Response.Write("success");
 //存储session
 }
 else
 {
 context.Response.Write("fail");
 }

ok, a simple login function is completed, of course, the password is not encrypted when logging in.

Let’s take a look at jQuery’s encryption plug-in MD5 plug-in. It is very convenient to use. By adding a reference to md5.js, you can use the $.md5() function to encrypt the string.
The above code is as follows Make slight changes and you can see the encrypted string. In
login.htm:

##

data: "username=" + escape($('#username').val()) + "&password=" + $.md5(escape($('#password').val())),

success: function (msg) {
      $("#loading").hide(); //隐藏loading
      alert(msg);
      if (msg == "success") {
       //parent.tb_remove();
       parent.document.location.href = "admin.htm"; //如果登录成功则跳到管理界面
       parent.tb_remove();
      }
      if (msg == "fail") {
       alert("登录失败！");
      }
     }

Add the password to LoginHandler.ashx and return it. ：

context.Response.Write(password);

ok, running the program again will pop up the MD5 encrypted string of the entered password.

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