JQuery遮罩層登入介面效果的實現，AJAX實現登入驗證，文章尾有完整樣本源碼下載，歡迎大家學習研究。
作業系統：Windwos7 Ultimate
開發工具：Visual Studio 2010
資料庫：Sql Server 2005
測試瀏覽器：IE8、FF3.6.8、Google Chrome （IE8中彈出登入層後會出現豎拉條，其他兩種沒有出現，那個豎拉條可以在JS中通過修改數值讓其不出現，但是下面會出現白邊，越來越覺得IE有點那個了......）
1、預覽
1）登入前
2）點擊登入顯示登入視窗（層），同時用一個灰色透明層遮罩主表單內容，點擊【登入】，隱藏【登入】，顯示loading圖，登入失敗，顯示【登入】，隱藏登入圖，同時顯示提示資訊
3）登入成功後，去掉去掉遮罩層和登入層，顯示“xxx，您好！ ”
2、實現
使用VS2010建立一個Web Site，此功能是在主版頁面Site.master中實現的。VS2010會自動添加JQuery的js檔案到Scripts檔案夾，並建立一個主版頁面和基於此主版頁面的Default.aspx和About.aspx兩個表單。
1）登入層介面設計，看Site.master中的代碼
<%@ 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">登入</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="首頁" /> <asp:MenuItem NavigateUrl="~/About.aspx" Text="關於" /> </Items> </asp:Menu> </div> </div> <!--登入視窗: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;"> 使用者登入 </td> <td> <img src="Images/Button/close.gif" id="closeBtn" align="absmiddle" alt="關閉" title="關閉" /> </td> </tr> <tr> <td colspan="2" style="height: 5px;"> </td> </tr> <tr> <td align="right"> 使用者名稱： </td> <td> <asp:TextBox ID="txtUserName" runat="server"></asp:TextBox> </td> </tr> <tr> <td align="right"> 密 碼： </td> <td> <asp:TextBox ID="txtPassword" TextMode="Password" runat="server"></asp:TextBox> </td> </tr> <tr> <td align="right"> 驗證碼： </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="驗證碼" title="看不清，點擊圖片更換圖片" /> </td> </tr> <tr> <td colspan="2" align="center"> <a onclick="CheckLogin()" id="alogin">登 錄</a> <img id="loading" src="Images/Loading/loading04.gif" alt="正在登入" title="正在登入..." /> <br /> <span id="showMes"></span> </td> </tr> </table> </div> <!--登入視窗: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）實現遮罩層和彈出登入介面的層的js檔案Scripts/common.js的代碼，注意，裡面硬寫了一些主版頁面Site.master中的元素的ID
$(function () { var screenwidth, screenheight, mytop, getPosLeft, getPosTop screenwidth = $(window).width(); screenheight = $(window).height(); //擷取捲軸距頂部的位移 mytop = $(document).scrollTop(); //計算彈出層的left getPosLeft = screenwidth / 2 - 200; //計算彈出層的top getPosTop = screenheight / 2 - 150; //css定位彈出層 $("#divLoginWindow").css({ "left": getPosLeft, "top": getPosTop }); //當瀏覽器視窗大小改變時 $(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 }); }); //當拉動捲軸時，彈出層跟著移動 $(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 }); }); //點選連結彈出登入視窗 $("#popup").click(function () { $("#divLoginWindow").fadeIn("slow"); //toggle("slow"); $("#txtUserName").focus(); //擷取頁面文檔的高度 var docheight = $(document).height(); //追加一個層，使背景變灰 $("body").append("<div id='greybackground'></div>"); $("#greybackground").css({ "opacity": "0.5", "height": docheight }); return false; }); //點擊關閉按鈕 $("#closeBtn").click(function () { $("#divLoginWindow").fadeOut("slow"); ////hide(); //刪除變灰的層 $("#greybackground").remove(); return false; });});//更換驗證碼圖片function ChangeCode(obj) { obj.src = "Code.aspx?" + Math.random();}
3）點擊【登入】實現AJAX登入驗證功能的js檔案Scripts/login.js的代碼
var count = 0;$(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>登入失敗，請檢查後重試!(" + count + "次)</font>"); } } })}
4）請求的CheckLogin.aspx的後台代碼，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"); } }}
源碼下載：jQuery+AJAX實現遮罩層登入驗證介面
以上就是jQuery實現遮罩層登入介面，AJAX實現登入驗證的全部內容，希望對大家的學習有所協助
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