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js实现记住帐号或密码(js读写COOKIE)

2010-05-19 13:29 513 查看

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="test0417.aspx.cs" Inherits="test0417" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
<script language="javascript" type="text/javascript">
function onLoginLoaded()
{
if(isPostBack == "False")
{
GetLastUser();
}
}
function GetLastUser()
{
var id = "49BAC005-7D5B-4231-8CEA-16939BEACD67";
var usr = GetCookie(id);
if(usr != null)
{
document.getElementById('txtUserName').value = usr;
}
else
{
document.getElementById('txtUserName').value = "001";
}

GetPwdAndChk();
}

//點擊登錄時觸發客戶端事件
function SetPwdAndChk()
{
//取用戶名
var usr = document.getElementById('txtUserName').value;
//alert(usr);
//將最後一個用戶信息寫入到Cookie
SetLastUser(usr);
//如果記住密碼選項被選中
if(document.getElementById('chkRememberPwd').checked == true)
{
//取密碼值
var pwd = document.getElementById('txtPassword').value;
//alert(pwd);
var expdate = new Date();
expdate.setTime(expdate.getTime() + 14 * (24 * 60 * 60 * 1000));
//將用戶名和密碼寫入到Cookie
SetCookie(usr,pwd, expdate);
}
else
{
//如果沒有選中記住密碼,則立即過期
ResetCookie();
}
}

function SetLastUser(usr)
{
var id = "49BAC005-7D5B-4231-8CEA-16939BEACD67";
var expdate = new Date();
//當前時間加上兩周的時間
expdate.setTime(expdate.getTime() + 14 * (24 * 60 * 60 * 1000));
SetCookie(id, usr, expdate);
}

//用戶名失去焦點時調用該方法
function GetPwdAndChk()
{
var usr = document.getElementById('txtUserName').value;
var pwd = GetCookie(usr);

if(pwd != null)
{
document.getElementById('chkRememberPwd').checked = true;
document.getElementById('txtPassword').value = pwd;
}
else
{
document.getElementById('chkRememberPwd').checked = false;
document.getElementById('txtPassword').value = "";
}
}

//取Cookie的值
function GetCookie (name)
{
var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
while (i < clen)
{
var j = i + alen;
//alert(j);
if (document.cookie.substring(i, j) == arg)
return getCookieVal (j);
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0) break;
}
return null;
}

var isPostBack = "<%= IsPostBack %>";
function getCookieVal (offset)
{
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));

}

//寫入到Cookie
function SetCookie(name, value, expires)
{
var argv = SetCookie.arguments;
//本例中length = 3
var argc = SetCookie.arguments.length;

var expires = (argc > 2) ? argv[2] : null;
var path = (argc > 3) ? argv[3] : null;
var domain = (argc > 4) ? argv[4] : null;
var secure = (argc > 5) ? argv[5] : false;
document.cookie = name + "=" + escape (value) +
((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
((path == null) ? "" : ("; path=" + path)) +
((domain == null) ? "" : ("; domain=" + domain)) +
((secure == true) ? "; secure" : "");
}

function ResetCookie()
{
var usr = document.getElementById('txtUserName').value;
var expdate = new Date();
SetCookie(usr, null, expdate);
}

</script>
</head>
<body onload="onLoginLoaded()">
<form id="form1" runat="server">
<div>
<asp:TextBox ID="txtUserName" runat="server" onblur="GetPwdAndChk()"></asp:TextBox>
<asp:TextBox ID="txtPassword" runat="server"></asp:TextBox>
<asp:CheckBox ID="chkRememberPwd" runat="server" Text="記住密碼" />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="進入 " OnClientClick="SetPwdAndChk()"/>
</div>
</form>
</body>
</html>

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