JQuery遮罩层登录界面实现（AJAX实现登录验证，源码下载）
操作系统：Windwos7 Ultimate
开发工具：Visual Studio 2010
数据库：Sql Server 2005
测试浏览器：IE8、FF3.6.8、Google Chrome （IE8中弹出登录层后会出现竖拉条，其他两种没有出现，那个竖拉条可以在JS中通过修改数值让其不出现，但是下面会出现白边，越来越觉得IE有点那个了......）
1、预览
1）登录前
2）点击登录显示登录窗口（层） ，同时用一个灰色透明层遮罩主窗体内容，点击【登录】，隐藏【登录】，显示loading图，登录失败，显示【登录】，隐藏登录图，同时显示提示信息
3）登录成功后，去掉去掉遮罩层和登录层，显示“xxx，您好！ ”
2、实现
使用VS2010创建一个Web Site，此功能是在母版页Site.master中实现的。VS2010会自动添加JQuery的js文件到Scripts文件夹，并创建一个母版页和基于此母版页的Default.aspx和About.aspx两个窗体。
1）登录层界面设计，看Site.master中的代码
<%@ 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="关闭" title="关闭" />
</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="vertical-align: middle;" 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>
<!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="关闭" title="关闭" />
</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="vertical-align: middle;" 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>
2）实现遮罩层和弹出登录界面的层的js文件Scripts/common.js的代码，注意，里面硬写了一些母版页Site.master中的元素的ID
$(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;
});
//点击关闭按钮
$("#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?" + Math.random();
}
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;
});
//点击关闭按钮
$("#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?" + Math.random();
}
3）点击【登录】实现AJAX登录验证功能的js文件Scripts/login.js的代码
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?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>");
}
}
})
}
$(document).ready(function () {
$("#loading").hide()
});
function CheckLogin() {
$("#alogin").hide();
$("#loading").show();
var txtCode = $("#txtCode");
var txtName = $("#txtUserName");
var txtPwd = $("#txtPassword");
$.ajax({
url: "CheckLogin.aspx?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>");
}
}
})
}
4）请求的CheckLogin.aspx的后台代码，前台清除剩Page命令一行
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");
}
}
}
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");
}
}
}
