How to implement AJAX non-refresh login function

When you click the login button, a login window will pop up. After entering the correct username and password and clicking login, the login window will close and the status will be changed to the current username. This article mainly introduces how AJAX implements the refresh-free login function. Friends who need it can refer to it. Next

When you click the login button, a login window will pop up. After entering the correct username and password and clicking login, the login window will close and the status will be changed to the current username.

Step 1:

First of all, the pop-up window uses the controls in jquery-ui. The first step is to learn how to use it.

Open the development-bundle->demos under the decompressed jquery-UI and find index.html , select the model dialog under dialog, right-click to view the source code, observe how to use the control, and find a key code: $("#dialog-modal").dialog({height: 140,modal: true}); This is used If displayed, open the source code in the model message and find the key code for closing: $(this).dialog('close'); with these two lines of code, you can control the display and closing of the window, and you can proceed to the next step. Use You need to copy the css folder and js folder of the jquery-ui development package to the project.

Step 2:

Post the code of the general handler for handling AJAX requests here. , although when I actually write, I use it before writing, but it is impossible to list it in detail step by step here. In order to facilitate understanding, I will post the general handler code first:

1.IsLogin.ashx, use To determine whether the user is logged in, the user name will be returned when logging in. Note here that to use session in the general processing program, using System.Web.SessionState must be introduced and the IRequiresSessionState interface must be implemented

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.SessionState;
namespace AJAX无刷新登录.AJAX
{
 /// <summary>
 /// IsLogin 的摘要说明
 /// </summary>
 public class IsLogin : IHttpHandler,IRequiresSessionState
 {
  public void ProcessRequest(HttpContext context)
  {
   context.Response.ContentType = "text/plain";
   if (context.Session["userName"] != null)
   {
    string userName = context.Session["userName"].ToString();
    context.Response.Write("yes|"+userName);
   }
   else
   {
    context.Response.Write("no");
   }
  }
  public bool IsReusable
  {
   get
   {
    return false;
   }
  }
 }
}

2.CheckLogin.ashx, Used to detect whether the user name and password entered by the user match. If it is correct, it will return yes, if it is wrong, it will return no. For simplicity, the database is not connected here.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.SessionState;
namespace AJAX无刷新登录.AJAX
{
 /// <summary>
 /// CheckLogin 的摘要说明
 /// </summary>
 public class CheckLogin : IHttpHandler,IRequiresSessionState
 {
  public void ProcessRequest(HttpContext context)
  {
   context.Response.ContentType = "text/plain";
   string userName = context.Request["userName"];
   string password=context.Request["password"];
   if (userName=="admin"&&password=="admin")
   {
    context.Session["userName"] = "admin";
    context.Response.Write("ok");
   }
   else
   {
    context.Response.Write("no");
   }
  }
  public bool IsReusable
  {
   get
   {
    return false;
   }
  }
 }
}

3.LoginOut.ashx, used to control user logout, set the session to Empty.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.SessionState;
namespace AJAX无刷新登录.AJAX
{
 /// <summary>
 /// LoginOut 的摘要说明
 /// </summary>
 public class LoginOut : IHttpHandler,IRequiresSessionState
 {
  public void ProcessRequest(HttpContext context)
  {
   context.Response.ContentType = "text/plain";
   context.Session["userName"] = null;
  }
  public bool IsReusable
  {
   get
   {
    return false;
   }
  }
 }
}

The general processing program is over. The code of the main interface is posted below:

<!DOCTYPE html>
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <title></title>
 <link href="JQueryUI/css/ui-lightness/jquery-ui-1.8.2.custom.css" rel="stylesheet" />
 <script src="JQueryUI/jquery-1.4.2.min.js"></script>
 <script src="JQueryUI/jquery-ui-1.8.2.custom.min.js"></script>
 <script type="text/javascript">
  //判断是否登录,登录则显示登录名,隐藏登录按钮,显示注销按钮
  //否则相反
  var isLogin = function () {
   $.post("/AJAX/IsLogin.ashx", function (data) {
    var strs = data.split(&#39;|&#39;);
    if (strs[0] == "yes") {
     $("#divShowLogin").hide();
     $("#divShowLoginOut").show();
     $("#spanName").text(strs[1]);
    } else {
     $("#divShowLogin").show();
     $("#divShowLoginOut").hide();
     $("#spanState").text("未登录");
    }
   });
  }
 
  $(function () {
   isLogin();
   //点击登录弹出登录窗口
   $("#btnShowLogin").click(function () {
    //模态窗口,设定长宽
    $("#divLogin").dialog({
     height: 160,
     width: 300,
     modal: true
    });
   });
 
   //点击取消则关闭弹出框
   $("#btnCancel").click(function () {
    $("#divLogin").dialog(&#39;close&#39;);
   });
 
   //点击登录发送post请求在一般处理程序CheckLogin.ashx中验证登录,
   //根据回调函数结果判断是否登录成功
   $("#btnLogin").click(function () {
    var userName = $("#txtUserName").val();
    var password = $("#txtPwd").val();
    $.post("/AJAX/CheckLogin.ashx", { "userName": userName, "password": password }, function (data) {
     if (data == "ok") {
      $("#divLogin").dialog(&#39;close&#39;);
      isLogin();
     }
     else {
      alert("用户名或密码错误");
     }
    });
   });
 
   //点击注销发送post请求,在一般处理程序中设置session为null,并调用isLogin函数刷新状态
   $("#btnExit").click(function () {
    $.post("/AJAX/LoginOut.ashx", function () {
     isLogin();
    });
 
   });
 
  });
 </script>
</head>
<body>
 <form id="form1" runat="server">
  <div id="divShowLogin" style="display: none">
   <span id="spanState"></span>
   <input type="button" value="登录" id="btnShowLogin" />
  </div>
  <div id="divShowLoginOut" style="display: none">
   <span id="spanName"></span>
   <input type="button" value="注销" id="btnExit" />
  </div>
  <div id="divLogin" title="登录窗口" style="display: none">
   <table style="text-align: left" id="tbLoin">
    <tr>
     <td>用户名：</td>
     <td>
      <input type="text" id="txtUserName" /></td>
    </tr>
    <tr>
     <td>密码：</td>
     <td>
      <input type="password" id="txtPwd" /></td>
    </tr>
    <tr>
     <td>
      <input type="button" value="登录" id="btnLogin" /></td>
     <td style="text-align: left">
      <input type="button" value="取消" id="btnCancel" /></td>
    </tr>
   </table>
  </div>
 </form>
</body>
</html>