jQuery AJAX implements mask layer login verification interface (source code attached)

JQuery mask layer login interface effect implementation, AJAX implementation login verification, complete sample source code download is at the end of the article, everyone is welcome to study and study.

Operating system: Windwos7 Ultimate

Development tools: Visual Studio 2010

Database: Sql Server 2005

Test browsers: IE8, FF3.6.8, Google Chrome (in IE8, a vertical bar will appear after the login layer pops up, but the other two do not appear. The vertical bar can be modified in JS to prevent it from appearing. But there will be a white border below, and I feel more and more that IE is a bit like that...)
1. Preview

1) Before logging in

2) Click login to display the login window (layer), and use a gray transparent layer to cover the main form content. Click [Login], hide [Login], display the loading picture, if the login fails, display [Login], hide Log in picture and display prompt information

3) After successful login, remove the mask layer and login layer, and display "xxx, hello!"

2. Implementation

Use VS2010 to create a Web Site. This function is implemented in the master page Site.master. VS2010 will automatically add the JQuery js file to the Scripts folder, and create a master page and two forms based on this master page, Default.aspx and About.aspx.

1) Login layer interface design, see the code in Site.master

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="Site.master.cs" Inherits="SiteMaster" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head runat="server">
 <title>FlyNoteBook</title>
 <script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
 <script type="text/javascript" src="Scripts/common.js"></script>
 <link href="~/Styles/Site.css" rel="stylesheet" type="text/css" />
 <script type="text/javascript" src="Scripts/login.js"></script>
 <asp:ContentPlaceHolder ID="HeadContent" runat="server">
 </asp:ContentPlaceHolder>
</head>
<body>
 <form runat="server">
 <div class="page">
 <div class="header">
 <div class="title">
   <img src="Images/Pictures/logo3.png" alt="FlyNoteBook Logo" />
  FlyNoteBook
 </div>
 <div class="loginDisplay">
 <span id="popup" runat="server">登录</span>
 <span id="loginSuccess" runat="server"></span>
 </div>
 <div class="clear hideSkiplink">
 <asp:Menu ID="NavigationMenu" runat="server" CssClass="menu" EnableViewState="false"
  IncludeStyleBlock="false" Orientation="Horizontal">
  <Items>
  <asp:MenuItem NavigateUrl="~/Default.aspx" Text="首页" />
  <asp:MenuItem NavigateUrl="~/About.aspx" Text="关于" />
  </Items>
 </asp:Menu>
 </div>
 </div>
 <!--登录窗口:Begin-->
 <div id="divLoginWindow">
 <table style="width: 100%;" border="0" cellpadding="2" cellspacing="0">
 <tr style="background-color: #e0f3d9; border-bottom: #bfe5b3 solid 2px">
  <td style="height: 38px; width: 100px;">
   用户登录
  </td>
  <td>
  <img src="Images/Button/close.gif" id="closeBtn" align="absmiddle" alt="jQuery AJAX implements mask layer login verification interface (source code attached)_jquery" title="jQuery AJAX implements mask layer login verification interface (source code attached)_jquery" />
  </td>
 </tr>
 <tr>
  <td colspan="2" style="height: 5px;">
  </td>
 </tr>
 <tr>
  <td align="right">
   用户名：
  </td>
  <td>
   <asp:TextBox ID="txtUserName" runat="server"></asp:TextBox>
  </td>
 </tr>
 <tr>
  <td align="right">
   密   码：
  </td>
  <td>
   <asp:TextBox ID="txtPassword" TextMode="Password" runat="server"></asp:TextBox>
  </td>
 </tr>
 <tr>
  <td align="right">
   验证码：
  </td>
  <td>
   <asp:TextBox ID="txtCode" Style="width: 88px;" runat="server"></asp:TextBox>
  <img src="Code.aspx" id="imgRndCode"   style="max-width:90%" onclick="ChangeCode(this);"
  alt="验证码" title="看不清，点击图片更换图片" />
  </td>
 </tr>
 <tr>
  <td colspan="2" align="center">
  <a onclick="CheckLogin()" id="alogin">登 录</a>
  <img id="loading" src="Images/Loading/loading04.gif" alt="正在登录" title="正在登录..." />
  <br />
  <span id="showMes"></span>
  </td>
 </tr>
 </table>
 </div>
 <!--登录窗口:End-->
 <div class="main">
 <asp:ContentPlaceHolder ID="MainContent" runat="server" />
 </div>
 <div class="clear">
 </div>
 </div>
 <div class="footer">
 <a href="http://www.cnblogs.com/Ferry/">By Ferry</a>
 </div>
 </form>
</body>
</html>

Copy after login

2) The code of the js file Scripts/common.js that implements the mask layer and the layer that pops up the login interface. Note that the IDs of some elements in the master page Site.master are hard-written in it

$(function () {
 var screenwidth, screenheight, mytop, getPosLeft, getPosTop
 screenwidth = $(window).width();
 screenheight = $(window).height();
 //获取滚动条距顶部的偏移
 mytop = $(document).scrollTop();
 //计算弹出层的left
 getPosLeft = screenwidth / 2 - 200;
 //计算弹出层的top
 getPosTop = screenheight / 2 - 150;
 //css定位弹出层
 $("#divLoginWindow").css({ "left": getPosLeft, "top": getPosTop });
 //当浏览器窗口大小改变时
 $(window).resize(function () {
 screenwidth = $(window).width();
 screenheight = $(window).height();
 mytop = $(document).scrollTop();
 getPosLeft = screenwidth / 2 - 200;
 getPosTop = screenheight / 2 - 150;
 $("#divLoginWindow").css({ "left": getPosLeft, "top": getPosTop + mytop });
 });
 //当拉动滚动条时，弹出层跟着移动
 $(window).scroll(function () {
 screenwidth = $(window).width();
 screenheight = $(window).height();
 mytop = $(document).scrollTop();
 getPosLeft = screenwidth / 2 - 200;
 getPosTop = screenheight / 2 - 150;
 $("#divLoginWindow").css({ "left": getPosLeft, "top": getPosTop + mytop });
 });
 //点击链接弹出登录窗口
 $("#popup").click(function () {
 $("#divLoginWindow").fadeIn("slow"); //toggle("slow"); 
 $("#txtUserName").focus();
 //获取页面文档的高度
 var docheight = $(document).height();
 //追加一个层，使背景变灰
 $("body").append("<div id='greybackground'></div>");
 $("#greybackground").css({ "opacity": "0.5", "height": docheight });
 return false;
 });
 //点击jQuery AJAX implements mask layer login verification interface (source code attached)_jquery按钮
 $("#closeBtn").click(function () {
 $("#divLoginWindow").fadeOut("slow"); ////hide();
 //删除变灰的层
 $("#greybackground").remove();
 return false;
 });
});

//更换验证码图片
function ChangeCode(obj) {
 obj.src = "Code.aspx&#63;" + Math.random();
}

Copy after login

3) Click [Login] to implement the code of the js file Scripts/login.js that implements the AJAX login verification function

var count = 0;
$(document).ready(function () {
 $("#loading").hide()
});

function CheckLogin() {
 $("#alogin").hide();
 $("#loading").show();
 var txtCode = $("#txtCode");
 var txtName = $("#txtUserName");
 var txtPwd = $("#txtPassword");
 $.ajax({
 url: "CheckLogin.aspx&#63;Code=" + txtCode.val() + "&Name=" + txtName.val() + "&Pwd=" + txtPwd.val(),
 type: "post",
 datatype: "text",
 success: function (returnValue) {
 if (returnValue != "false") {
 $("#popup").hide();
 $("#showMes").hide();
 $("#loginSuccess").html(returnValue + '，您好!');
 $("#divLoginWindow").remove();
 $("#greybackground").remove();
 $("#showMes").hide();
 }
 else {
 count = count + 1;
 $("#loading").hide();
 $("#alogin").show();
 $("#showMes").show();
 $("#showMes").html("<font color=red>登录失败，请检查后重试!(" + count + "次)</font>");
 }
 }
 })
}

Copy after login

4) The requested CheckLogin.aspx background code, the front desk clears the remaining Page command line

using System;
using System.Data;

public partial class CheckLogin : System.Web.UI.Page
{
 protected void Page_Load(object sender, EventArgs e)
 {
 try
 {
 String strCode = Request.QueryString["Code"];
 String strName = Request.QueryString["Name"];
 String strPassword = Request.QueryString["Pwd"];

 if (strCode != Session["Code"].ToString())
 {
 Response.Write("false");
 }
 else
 {
 DAO.SqlHelper helper = new DAO.SqlHelper();
 DataTable dt = helper.FillDataTable(String.Format("Select UserName,TrueName From Clients Where UserName='{0}' And Password='{1}'",
  strName,
  strPassword
  ));
 if (dt != null && dt.Rows.Count > 0)
 {
  Session["TrueName"] = dt.Rows[0]["TrueName"].ToString();
  Response.Write(dt.Rows[0]["TrueName"].ToString());
 }
 else
 {
  Response.Write("false");
 }
 }
 }
 catch
 {
 Response.Write("false");
 }
 }
}

Copy after login

Source code download: jQuery AJAX implements mask layer login verification interface

The above is the entire content of jQuery to implement the mask layer login interface and AJAX to implement login verification. I hope it will be helpful to everyone's learning