Ajax+asp.net实现用户登陆
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2024-02-21 20:57:46
以用户登录为例练习ajax的使用方法
login.html
以用户登录为例练习ajax的使用方法
login.html
<!doctype html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title></title>
<script type="text/javascript">
var obj = createobj();
function login(name, pwd)
{
var urlstr = "http://localhost:14248/server.aspx?username=" + name + "&password=" + pwd;
obj.open("get", urlstr, true);
obj.onreadystatechange = dowork;
obj.send();
}
function dowork()
{
if (obj.readystate == 4)
{
if (obj.status == 200)
{
document.getelementbyid("msg").innertext = obj.responsetext;
}
}
}
//创建对象
function createobj()
{
var xmlhttp = null;
try {
//非ie浏览器
xmlhttp = new xmlhttprequest();
}
catch (e)
{ //ie浏览器
try{
xmlhttp = new activexobject("msxml2.http");
}
catch (e)
{
xmlhttp = new activexobject("microsoft.xmlhttp");
}
}
return xmlhttp;
}
</script>
</head>
<body>
<table>
<tr>
<td align="center" colspan="2">登录</td>
</tr>
<tr>
<td>用户名：</td>
<td><input type="text" id="username" name="username" /></td>
</tr>
<tr>
<td>密码：</td>
<td><input type="password" id="password" name="password" /></td>
</tr>
<tr>
<td >
<input type="submit" value="登录" onclick="login(document.getelementbyid('username').value,document.getelementbyid('password').value)" />
</td>
<td>
<input type="reset" value="清空" />
</td>
<td><span id="msg"></span></td>
</tr>
</table>
</body>
</html>
dal.cs
using system;
using system.collections.generic;
using system.data;
using system.data.sqlclient;
using system.linq;
using system.web;
namespace ajaxtest
{
public class dal
{
private string connstr = "server=acer-pc;database=mydatabase;user id=sa;password=123456";
public datatable selectdb(string sql)
{
datatable dt = new datatable();
try
{
sqlconnection conn = new sqlconnection(connstr);
sqldataadapter sda = new sqldataadapter(sql, conn);
sda.fill(dt);
}
catch(exception e)
{}
return dt;
}
}
}
bll.cs
using system;
using system.collections.generic;
using system.data;
using system.linq;
using system.web;
namespace ajaxtest
{
public class bll
{
public bool login(string username,string password)
{
try
{
string sql = "select password from users where username='" + username + "'";
dal sqlselect = new dal();
datatable dt = sqlselect.selectdb(sql);
if (dt.rows[0]["password"].tostring() != password)
return false;
}
catch (exception)
{
}
return true;
}
}
}
server.aspx.cs
using system;
using system.collections.generic;
using system.linq;
using system.web;
using system.web.ui;
using system.web.ui.webcontrols;
namespace ajaxtest
{
public partial class server : system.web.ui.page
{
protected void page_load(object sender, eventargs e)
{
string username = request["username"].tostring();
string password = request["password"].tostring();
bll b = new bll();
if (b.login(username, password))
{
response.write("登录成功");
response.end();
}
else
{
response.write("登录失败");
response.end();
}
}
}
}
server.aspx
<%@ page language="c#" autoeventwireup="true" codebehind="server.aspx.cs" inherits="ajaxtest.server" %> <!doctype html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="content-type" content="text/html; charset=utf-8"/> <title></title> </head> <body> <form id="form1" runat="server"> <div> </div> </form> </body> </html>
以上所述就是本文的全部内容了，希望大家能够喜欢。