JQuery遮罩层登录

          

  下面把jquery实现遮罩层，也就是上面效果的代码贴出来，大家可以借鉴的看看

  css样式：

  

/* DEFAULTS
----------------------------------------------------------*/

body   
{
    /*background: #b6b7bc;*/
    font-size: .80em;
    font-family: "Helvetica Neue", "Lucida Grande", "Segoe UI", Arial, Helvetica, Verdana, sans-serif;
    margin: 0px;
    padding: 0px;
    color: #696969;
}
td
{
    height:35px;
}
        /*设置弹出层窗口的大小*/
        #divLoginWindow
        {
            display: none;
            position: absolute;
            width: 400px;
            height: 210px;
            border: #bfe5b3 solid 1px;
            z-index: 200;
            background: #fff;
        }
        #closeBtn
        {
            position: absolute;
            right: 10px;
            top: 10px;
            cursor: hand;
        }
        /***遮罩层****/
        #greybackground
        {
            background: #000;
            display: block;
            z-index: 100;
            width: 100%;
            position: absolute;
            top: 0;
            left: 0;
        }
 a
 {
     cursor:pointer;
 }
/**********************************/

a:link, a:visited
{
    color: #034af3;
}

a:hover
{
    color: #1d60ff;
    text-decoration: none;
}

a:active
{
    color: #034af3;
}

p
{
    margin-bottom: 10px;
    line-height: 1.6em;
}


/* HEADINGS   
----------------------------------------------------------*/

h1, h2, h3, h4, h5, h6
{
    font-size: 1.5em;
    color: #666666;
    font-variant: small-caps;
    text-transform: none;
    font-weight: 200;
    margin-bottom: 0px;
}

h1
{
    font-size: 1.6em;
    padding-bottom: 0px;
    margin-bottom: 0px;
}

h2
{
    font-size: 1.5em;
    font-weight: 600;
}

h3
{
    font-size: 1.2em;
}

h4
{
    font-size: 1.1em;
}

h5, h6
{
    font-size: 1em;
}

/* this rule styles <h1> and <h2> tags that are the 
first child of the left and right table columns */
.rightColumn > h1, .rightColumn > h2, .leftColumn > h1, .leftColumn > h2
{
    margin-top: 0px;
}


/* PRIMARY LAYOUT ELEMENTS   
----------------------------------------------------------*/

.page
{
    width: 960px;
    background-color: #fff;
    margin: 0px auto 0px auto;
    border: 1px solid #496077;
}

.header
{
    position: relative;
    margin: 0px;
    padding: 0px;
    background: #4b6c9e;
    width: 100%;
}

.header h1
{
    font-weight: 700;
    margin: 0px;
    padding: 0px 0px 0px 20px;
    color: #f9f9f9;
    border: none;
    line-height: 2em;
    font-size: 2em;
}

.main
{
    padding: 0px 12px;
    margin: 12px 8px 8px 8px;
    min-height: 420px;
}

.leftCol
{
    padding: 6px 0px;
    margin: 12px 8px 8px 8px;
    width: 200px;
    min-height: 200px;
}

.footer
{
    color: #4e5766;
    padding: 8px 0px 0px 0px;
    margin: 0px auto;
    text-align: center;
    line-height: normal;
}


/* TAB MENU   
----------------------------------------------------------*/

div.hideSkiplink
{
    background-color:#3a4f63;
    width:100%;
}

div.menu
{
    padding: 4px 0px 4px 8px;
}

div.menu ul
{
    list-style: none;
    margin: 0px;
    padding: 0px;
    width: auto;
}

div.menu ul li a, div.menu ul li a:visited
{
    background-color: #465c71;
    border: 1px #4e667d solid;
    color: #dde4ec;
    display: block;
    line-height: 1.35em;
    padding: 4px 20px;
    text-decoration: none;
    white-space: nowrap;
}

div.menu ul li a:hover
{
    background-color: #bfcbd6;
    color: #465c71;
    text-decoration: none;
}

div.menu ul li a:active
{
    background-color: #465c71;
    color: #cfdbe6;
    text-decoration: none;
}

/* FORM ELEMENTS   
----------------------------------------------------------*/

fieldset
{
    margin: 1em 0px;
    padding: 1em;
    border: 1px solid #ccc;
}

fieldset p 
{
    margin: 2px 12px 10px 10px;
}

fieldset.login label, fieldset.register label, fieldset.changePassword label
{
    display: block;
}

fieldset label.inline 
{
    display: inline;
}

legend 
{
    font-size: 1.1em;
    font-weight: 600;
    padding: 2px 4px 8px 4px;
}

input.textEntry 
{
    width: 320px;
    border: 1px solid #ccc;
}

input.passwordEntry 
{
    width: 320px;
    border: 1px solid #ccc;
}

div.accountInfo
{
    width: 42%;
}

/* MISC  
----------------------------------------------------------*/

.clear
{
    clear: both;
}

.title
{
    display: block;
    float: left;
    text-align: left;
    width: auto;
}

.loginDisplay
{
    font-size: 1.1em;
    display: block;
    text-align: right;
    padding: 10px;
    color: White;
    cursor:pointer;
}

.loginDisplay a:link
{
    color: white;
}

.loginDisplay a:visited
{
    color: white;
}

.loginDisplay a:hover
{
    color: white;
}

.failureNotification
{
    font-size: 1.2em;
    color: Red;
}

.bold
{
    font-weight: bold;
}

.submitButton
{
    text-align: right;
    padding-right: 10px;
}

   页面：

  

  <!--登录窗口:Begin-->
        <div id="divLoginWindow">
            <table style=" 100%;" border="0" cellpadding="2" cellspacing="0">
                <tr style="background-color: #e0f3d9; border-bottom: #bfe5b3 solid 2px">
                    <td style="height: 38px;  100px;">
                        &nbsp;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">
                        &nbsp;用户名：
                    </td>
                    <td>
                        &nbsp;<asp:TextBox ID="txtUserName" runat="server"></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td align="right">
                        &nbsp;密&nbsp;&nbsp;&nbsp;码：
                    </td>
                    <td>
                        &nbsp;<asp:TextBox ID="txtPassword" TextMode="Password" runat="server"></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td align="right">
                        &nbsp;验证码：
                    </td>
                    <td>
                        &nbsp;<asp:TextBox ID="txtCode" Style=" 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&nbsp;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-->

下面最重要的就是jquery代码了

Comm.js

$(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();
}

Login.js

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>");
            }
        },
        error: function () {
            alert("通信失败");
        }
    })
}

登录验证结合ajax实现的，比较简单，当然了，遮罩层里的内容可以随意替换的