用ajax技术实现 无刷新实现用户登录

原地址：http://blog.csdn.net/chuyuqing/article/details/13272755

代码如下:

// JScript 文件
function usersLogon()
{
    var userName = document.getElementById("txtuserName").value;
    var password = document.getElementById("txtpassword").value;
    var checkCode = document.getElementById("txtCheckCode").value;

    var response = userControl_logon.CheckCodeIsRight(checkCode).value;

    if(userName == "")
    {
        document.getElementById("txtuserName").focus();
        return false;
    }
    else if(password == "")
    {
        document.getElementById("txtpassword").focus();
        return false;
    }
    else if(checkCode =="")
    {
        document.getElementById("txtCheckCode").focus();
        return false;
    }
    else
    {
        if(response == true)
        {
            //判断用户是否存在
            userControl_logon.userNameAndPasswordIsExist(userName,password,userNameIsRight);
        }
        else
        {
            alert("验证码出错");
            userControl_logon.checkCodeOperaotr(refreshCheckCode);
            document.getElementById("txtpassword").value = "";
        }
    }    
}
function userNameIsRight(res)
{
    var userName = document.getElementById("txtuserName").value;
    if(res.value == true)
    {
        //用户存在,但要看此用户有没有进入管理留言版权限,
        userControl_logon.userNameIsRight(userName,CallBack);
    }
    else
    {
        alert("用户名或密码错误");
        document.getElementById("txtpassword").value = "";
        OnLoad_checkCode();
    }
}
function CallBack(res)
{
    if(res.value == true)
    {
        hideLogon();
        var url = userControl_logon.returnUrl();
        if ( url.value == 404)
        {
            showDefault();
        }
        else
        {
            document.getElementById("Url").innerHTML = '<a href="' + url.value + '">' + url.value + '</a>'
        }
    }
    else
    {
        alert("对不起你的权限不够");
        document.getElementById("txtpassword").value = "";
        OnLoad_checkCode();
    }
}
//隐藏登录框
function hideLogon()
{
    var element = document.getElementById("hideLogon")
    element.style.display = "none"
    
}
//显示返回首页
function showDefault()
{
    var element = document.getElementById("Returndefault")
    element.style.display = "block"  
}
function OnLoad_checkCode()
{
    userControl_logon.checkCodeOperaotr(refreshCheckCode);
    document.getElementById("txtuserName").focus();
    //    return false;
}
///重新得到新的验证吗
function refreshCheckCode(res)
{ 
    document.getElementById("txtCheckCode").value = "";
    document.getElementById("lblNumber").innerHTML = res.value;
}
function abce()
{
    alert(document.getElementById("lblNumber").value)
}

下而后面代码

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using LHB_SQL_2005;

public partial class userControl_logon : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            AjaxPro.Utility.RegisterTypeForAjax(typeof(userControl_logon));
        }
    }

    [AjaxPro.AjaxMethod]
    public static  string checkCodeOperaotr()
    {
        string _checkCode = GeneralMethod.GenerateCheckCode();
        System.Web.HttpContext.Current.Session["checkCode"] = _checkCode;
        //返回验证码
        return _checkCode;
    }

    /// <summary>
    /// 判断验证是否正确
    /// </summary>
    /// <param name="checkCode"></param>
    /// <returns></returns>
    [AjaxPro.AjaxMethod]
    public static bool CheckCodeIsRight(string checkCode)
    {
        string _checkCode = (string)(System.Web.HttpContext.Current.Session["checkCode"]); 
        if (_checkCode == checkCode)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    /// <summary>
    /// 判断用户名及密码添加是否正确
    /// </summary>
    /// <param name="userName">用户名</param>
    /// <param name="_password">用户名密码</param>
    /// <returns>bool</returns>
    [AjaxPro.AjaxMethod]
    public static bool userNameAndPasswordIsExist(string userName, string _password)
    {
        string password = GeneralMethod.ToEncryptPassword(_password);
        string executeString = "SELECT COUNT(*) FROM users WHERE userName = '" + userName.ToString() + "' AND password = '" + password + "'";
        int count = int.Parse(GetCommand.ExecuteScalar(executeString));
        if (count == 1)
        {
            System.Web.HttpContext.Current.Session["userName"] = userName;
            return true;
        }
        else
        {
            return false;
        }
    }

    /// <summary>
    /// 判断用户是不是有这进入管理留言版的权限
    /// </summary>
    /// <param name="userName">用户名</param>
    /// <returns></returns>
    [AjaxPro.AjaxMethod]
    public static bool userNameIsRight(string userName)
    {
        string executeString = "SELECT [right] FROM role WHERE usersId = (select userNameId from users where userName = '" + userName + "')";
        int count = int.Parse(GetCommand.ExecuteScalar(executeString));
        if (count > 0)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    /// <summary>
    /// 返回Url值
    /// </summary>
    /// <returns></returns>
    [AjaxPro.AjaxMethod]
    public static string returnUrl()
    {
        string url = "";
        try
        {
            url = System.Web.HttpContext.Current.Session["url"].ToString();
        }
        catch
        {
            url ="404";
        }
        return url;
    }
}

下面是页面代码

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="logon.ascx.cs" Inherits="userControl_logon" %>
<script language="javascript" type="text/javascript" src="../JavaScript/logon.js">
</script>
<script language="javascript" type="text/javascript" src="JavaScript/logon.js">
</script>
<link href="../CSS/table_css.css" rel="stylesheet" type="text/css" />
<link href="CSS/table_css.css" rel="stylesheet" type="text/css" />
<body onload="OnLoad_checkCode();">
<div>
<table border="0" cellpadding="0" cellspacing="0">
        <tr>
            <td>
                <table id="hideLogon" border="0" cellpadding="0" cellspacing="0" style="display:block;">
                    <tr>
                        <td style="background-color: #99ccff">用户名：</td>
                        <td><input type="text" id="txtuserName" style="width: 105px" /></td>
                    </tr>
                    <tr>
                        <td style="background-color: #99ccff">密  码：</td>
                        <td>
                            <input id="txtpassword" type="password" style="width: 105px" /></td>
                    </tr>
                    <tr>
                        <td style="background-color: #99ccff">验证码：</td>
                        <td style="background-color: #99ccff">
                            <input type= "text" id="txtCheckCode" style=" width:60px" /><label id="lblNumber"></label></td>
                    </tr>
                    <tr>
                        <td style="background-color: #99ccff"></td>
                        <td style="background-color: #99ccff">
                            <input type="button" onclick="usersLogon();" value="登录" id="btnLogon" /></td>
                    </tr>
                </table>
            </td>
        </tr>
        <tr>
            <td >
               <div id="Url"></div>
            </td>
        </tr>
        <tr>
            <td align="center">
                <table id="Returndefault" border="0" cellpadding="0" cellspacing="0" style="display:none;">
                    <tr>
                        <td>
                            <asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl="~/Default.aspx">返回首页</asp:HyperLink></td>
                    </tr>
                </table>
            </td>
        </tr>
    </table>
</div>
</body>