一款经典的ajax登录页面 后台asp.net
下面实现一个经典的登录页面,有保存密码功能,页面上所有的控件都是html控件,没有服务器控件
1,新建一名为login.htm的静态网页文件,作为登录页面,如图
body标签代码
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<body onkeydown ="enterLogin()"> <!--添加按下键盘事件-->
<div style="text-align: center">
<table border="1" cellpadding="1">
<tr>
<td align="center" style="width: 100px; height: 20px; background-color: #99cccc"
valign="middle">
用户名:</td>
<td align="center" style="width: 74px; height: 20px; background-color: #99cccc" valign="middle">
<input id="txtusername" style="width: 111px; height: 19px" type="text" onblur ="checkuser()" /></td>
<td align="center" style="width: 199px; height: 20px; background-color: #99cccc"
valign="middle"><img src="" id ="imgCheck" style = "visibility :hidden; "/ ><span id ="unMessage">
</span></td>
</tr>
<tr>
<td align="center" style="width: 100px; height: 29px; background-color: #99cccc"
valign="middle">
密码:</td>
<td align="center" style="width: 74px; height: 29px; background-color: #99cccc" valign="middle">
<input id="txtpwd" style="width: 107px; height: 17px" type="password" /></td>
<td align="center" style="width: 199px; height: 29px; background-color: #99cccc"
valign="middle"><span id ="pwdMessage"></span>
</td>
</tr>
<tr>
<td align="center" colspan="3" style="background-color: #99cccc" valign="middle">
<input id="cbRememberPwd" type="checkbox" />记住密码一个月</td>
</tr>
<tr>
<td align="center" colspan="3" style="background-color: #99cccc" valign="middle">
<input id="btnOK" type="button" value="登录" onclick ="login()" />
<input id="btnReset" type="button" value="重置" onclick ="reset()" /></td>
</tr>
</table>
</div>
</body>
2,在login.htm中引入外部js代码
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--><script type ="text/javascript" src ="aj.js" ></script>
<script type ="text/javascript" src ="loginCookies.js" ></script>
其中aj.js为ajax封装的类,loginCookie.js为对Cookie操作的代码
aj.js代码如下
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-->//JScript文件
//ajax请求功能函数
//作者:吴宝佑
//get调用方式:(1)实例化 var aj=new ajax(); (2)调用get函数 aj.get(url,callback) (3)写回调函数 function callback(xhr){xhr.responsetext}
//post调用方式:(1)实例化 var aj=new ajax(); (2)调用post函数 aj.post(url,content,callback) (3)写回调函数 function callback(xhr){xhr.responsetext}
//构造ajax对象
function ajax()
{
function getXHR()//获取xmlhttprequest
{
var request=false;
try
{
request = new XMLHttpRequest();
}
catch (trymicrosoft)
{
try
{
request = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (othermicrosoft)
{
try
{
request = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (failed)
{
request = false;
}
}
}
return request;
}
this.get = function (openUrl,successFun)//ajax对象的get方法,通过get方式发送请求,openUrl为请求的页面,successFun为成功回调执行的函数
{
var request = getXHR();
request.open("get",openUrl,true);
// request.onreadystatechange = function ()
// {
// if (request.readystate==4)
// {
// if (request.status==200)
// {
// successFun(request);
// }
// }
// };
request.onreadystatechange = update;
function update()
{
if (request.readystate==4)
{
if (request.status==200)
{
successFun(request);
}
}
}
request.send(null);
}
this.post = function (openUrl,sendContent,successFun)//ajax对象的post方法,通过post方式发送请求,openUrl为请求的页面,successFun为成功回调执行的函数
{
var request = getXHR();
request.open("post",openUrl,true);
request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");//告诉服务器发送的是文本
request.onreadystatechange = update;
function update()
{
if (request.readystate==4)
{
if (request.status==200)
{
successFun(request);
}
}
}
request.send(sendContent);
}
}
loginCookie.js代码如下
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-->//JScript文件
//SetCookie 保存一个Cookie。参数中除了name和value以外,其他可以省略。
//GetCookie 通过一个Cookie的名字取出它的值。
//DelCookie 删除一个Cookie,也就是让一个Cookie立刻过期。参数中除了name,其他可以省略。
//测试
//SetCookie("username", "123");expires代表"月"
//alert(GetCookie("username"));
//DelCookie("username");
//alert(GetCookie("username"));
function SetCookie(name, value, expires, path, domain, secure) {
var today = new Date();
today.setTime(today.getTime());
if(expires) { expires *= 2592000; }
var expires_date = new Date(today.getTime() + (expires));
document.cookie = name + "=" + escape(value)
+ (expires ? ";expires=" + expires_date.toGMTString() : "")
+ (path ? ";path=" + path : "")
+ (domain ? ";domain=" + domain : "")
+ (secure ? ";secure" : "");
}
function GetCookie(name) {
var cookies = document.cookie.split( ';' );
var cookie = '';
for(var i=0; i<cookies.length; i++) {
cookie = cookies[i].split('=');
if(cookie[0].replace(/^\s+|\s+$/g, '') == name) {
return (cookie.length <= 1) ? "" : unescape(cookie[1].replace(/^\s+|\s+$/g, ''));
}
}
return null;
}
function Delcookie(name, path, domain) {
document.cookie = name + "="
+ (path ? ";path=" + path : "")
+ (domain ? ";domain=" + domain : "")
+ ";expires=Thu, 01-Jan-1970 00:00:01 GMT";
}
3,写login.htm页面中的js代码,放在head标签之间
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--> <script type ="text/javascript" >
window.onload = function (){
document.getElementById ('txtusername').focus();//用户名框获得焦点
if (GetCookie('user_name') != null && GetCookie('user_pwd') != null)//设置记住密码的登录页面
{
document.getElementById ("txtusername").value = GetCookie('user_name');
document.getElementById ("txtpwd").value = GetCookie('user_pwd');
}
}
String.prototype.Trim = function() //自定义的去除字符串两边空格的方法
{
return this.replace(/(^\s*)|(\s*$)/g, "");
}
function checkuser()//检验用户名是否正确
{
var img = document.getElementById ("imgCheck")
img.src="iamges/blue-loading.gif";//设置图片及其可见性
img.style.visibility = "visible";
var aj = new ajax();//以下为ajax请求
var username = document.getElementById ("txtusername").value.Trim();
var url = "login.aspx?uname="+escape(username);
aj.get(url,callback);
function callback(obj)
{
var response = obj.responsetext;
var res = response.split('\n');
if (res[0] == "ok")
{
img.src="iamges/icon-info.gif";
document.getElementById ("unMessage").innerHTML = "<font color='#00ff00'>用户名正确</font>";
}
else
{
img.src="iamges/icon-warning.gif";
document.getElementById ("unMessage").innerHTML = "<font color='#ff0000'>用户名错误</font>";
}
}
}
function login()//登录
{
if (document.getElementById ("unMessage").innerText == "用户名错误")
{
alert("你的用户名错误");
}
else if (document.getElementById ("txtpwd").value == "")
{
alert("请输入密码");
}
else
{
var aj = new ajax();
var username = document.getElementById ("txtusername").value.Trim();
var userpwd = document.getElementById ("txtpwd").value;
var url = "login.aspx?name="+escape(username)+"&pwd="+escape(userpwd);
aj.get(url,callback);
function callback(obj)
{
var response = obj.responsetext;
var res = response.split('\n');
if (res[0] == "ok")
{
if (document.getElementById ("cbRememberPwd").checked)
{
SetCookie('user_name',username,1);//保存密码一个月
SetCookie('user_pwd',userpwd,1);
}
else
{
SetCookie('user_name',username);
SetCookie('user_pwd',userpwd);
}
window.open ("loginIndex.htm","_self");
}
else
&p; {
alert("密码错误");
}
}
}
}
function reset()//重置
{
window.onload();//执行窗体登录事件
document.getElementById ("txtusername").value="";
document.getElementById ("txtpwd").value="";
}
function enterLogin()
{
if (event.keyCode==13) //如果按下的是Enter键的话,就执行登录语句
{
login();
}
}
</script>
4,新建一名为login.aspx的页面,该页面作为ajax请求的页面,login.aspx.cs代码如下
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--> protected void Page_Load(object sender, EventArgs e)
{
OleDbConnection Conn = DBcon.get_con();
if (Request["uname"] != null)
{
string username = Request["uname"].ToString();
string strSql = "select * from [user] where u_name='" + username + "'";
Conn.Open();
OleDbCommand Comd = new OleDbCommand(strSql, Conn);
OleDbDataReader dr = Comd.ExecuteReader();
if (dr.Read())
{
Response.Write("ok\n");
}
else
{
Response.Write("fail\n");
}
//if (Comd.ExecuteNonQuery() > 0)
//{
// Response.Write("存在这个用户\n");
//}
//else
//{
// Response.Write("没有此用户名\n");
//}
Conn.Close();
}
if (Request["name"] != null && Request["pwd"] != null)
{
string name = Request["name"].ToString();
string pwd = Request["pwd"].ToString();
string strSql = "select * from [user] where u_name='" + name + "'" + " and u_pwd='" + pwd + "'";
Conn.Open();
OleDbCommand Comd = new OleDbCommand(strSql, Conn);
OleDbDataReader dr = Comd.ExecuteReader();
if (dr.Read())
{
Response.Write("ok\n");
}
else
{
Response.Write("fail\n");
}
}
}
5,新建一名为loginIndex.htm的静态页面,作为用户登录之后的首页
其body标签代码如下
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--><body>
<span id ="username"> </span>
</body>
6,在loginIndex.htm页面引入loginCookie.js文件
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--><script type ="text/javascript" src ="loginCookies.js" ></script>
7,写loginIdex.htm页面的js代码,放在head标签之间
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--> <script type ="text/javascript" >
window.onload = function ()
{
if(GetCookie('user_name')==null || GetCookie('user_pwd')==null)//如果没有登录,而是直接在网页中输入网址的
{
alert('你还没有登录!\n返回到登陆页面。');
window.navigate("login.htm");
}
else
{
var uname = GetCookie('user_name');
document.getElementById ('username').innerHTML ="欢迎你: " + uname + " <a href='#' onclick = 'off()'>注销</a>";//提供"注销"按钮
}
}
function off()//注销事件
{
if (window.confirm("你真要注销吗?"))
{
Delcookie("user_name");
Delcookie("user_pwd");
window.navigate("login.htm");
}
}
</script>
8,完成,客户端代码较多,但是交互性很好
演示如下:
当输入完用户名,鼠标光标离开用户名框之后,系统会快速检验用户名是否合法
进入首页后,出现的窗口,带有当前登录的用户和注销按钮
当用户点击注销按钮时,会友情提示你是否真的注销
当你不是输入用户和密码登陆,也是直接在浏览器地址栏中输入首页网址的时候,系统会提示你没有登录,并直接返回到登陆页面。
当用户输入了有效的用户名和密码,并要求系统记住密码,用户下次进入到登录页面时,系统会把上次记住的用户名和密码显示在输入框中。。
并且这个时候直接在浏览器的地址栏中输入首页地址,也是能正常访问的。
nbsp; {
alert("密码错误");
}
}
}
}
function reset()//重置
{
window.onload();//执行窗体登录事件
document.getElementById ("txtusername").value="";
document.getElementById ("txtpwd").value="";
}
function enterLogin()
{
if (event.keyCode==13) //如果按下的是Enter键的话,就执行登录语句
{
login();
}
}
</script>
4,新建一名为login.aspx的页面,该页面作为ajax请求的页面,login.aspx.cs代码如下
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--> protected void Page_Load(object sender, EventArgs e)
{
OleDbConnection Conn = DBcon.get_con();
if (Request["uname"] != null)
{
string username = Request["uname"].ToString();
string strSql = "select * from [user] where u_name='" + username + "'";
Conn.Open();
OleDbCommand Comd = new OleDbCommand(strSql, Conn);
OleDbDataReader dr = Comd.ExecuteReader();
if (dr.Read())
{
Response.Write("ok\n");
}
else
{
Response.Write("fail\n");
}
//if (Comd.ExecuteNonQuery() > 0)
//{
// Response.Write("存在这个用户\n");
//}
//else
//{
// Response.Write("没有此用户名\n");
//}
Conn.Close();
}
if (Request["name"] != null && Request["pwd"] != null)
{
string name = Request["name"].ToString();
string pwd = Request["pwd"].ToString();
string strSql = "select * from [user] where u_name='" + name + "'" + " and u_pwd='" + pwd + "'";
Conn.Open();
OleDbCommand Comd = new OleDbCommand(strSql, Conn);
OleDbDataReader dr = Comd.ExecuteReader();
if (dr.Read())
{
Response.Write("ok\n");
}
else
{
Response.Write("fail\n");
}
}
}
5,新建一名为loginIndex.htm的静态页面,作为用户登录之后的首页
其body标签代码如下
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--><body>
<span id ="username"> </span>
</body>
6,在loginIndex.htm页面引入loginCookie.js文件
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--><script type ="text/javascript" src ="loginCookies.js" ></script>
7,写loginIdex.htm页面的js代码,放在head标签之间
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--> <script type ="text/javascript" >
window.onload = function ()
{
if(GetCookie('user_name')==null || GetCookie('user_pwd')==null)//如果没有登录,而是直接在网页中输入网址的
{
alert('你还没有登录!\n返回到登陆页面。');
window.navigate("login.htm");
}
else
{
var uname = GetCookie('user_name');
document.getElementById ('username').innerHTML ="欢迎你: " + uname + " <a href='#' onclick = 'off()'>注销</a>";//提供"注销"按钮
}
}
function off()//注销事件
{
if (window.confirm("你真要注销吗?"))
{
Delcookie("user_name");
Delcookie("user_pwd");
window.navigate("login.htm");
}
}
</script>
8,完成,客户端代码较多,但是交互性很好
演示如下:
当输入完用户名,鼠标光标离开用户名框之后,系统会快速检验用户名是否合法
进入首页后,出现的窗口,带有当前登录的用户和注销按钮
当用户点击注销按钮时,会友情提示你是否真的注销
当你不是输入用户和密码登陆,也是直接在浏览器地址栏中输入首页网址的时候,系统会提示你没有登录,并直接返回到登陆页面。
当用户输入了有效的用户名和密码,并要求系统记住密码,用户下次进入到登录页面时,系统会把上次记住的用户名和密码显示在输入框中。。
并且这个时候直接在浏览器的地址栏中输入首页地址,也是能正常访问的。