以下是网学网为您推荐的Ajax-一款经典的ajax登录页面 后台asp.net,希望本篇文章对您学习有所帮助。
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
复制代码 代码如下:
<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
<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
//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);
}
}l