没有控件手工AJAX程序注册页面

效果图:

数据库里面没有这个用户时数据库里面有这个用户时

数据库文件:

JS代码:

// 声明XmlHttpRequest

var xmlHttp;

function CheckName(userName)

{

createXMLHTTP(); //创建XmlHttpRequest对象

var url="DisposeEvent.aspx?Name="+userName;

xmlHttp.open("GET",url,true);

xmlHttp.onreadystatechange=checkUserName;

xmlHttp.send(null);

}

//执行检测用户回调函数

function checkUserName()

{

if(xmlHttp.readyState==4) //判断对象状态

{

if(xmlHttp.Status==200) //信息成功返回,开始处理信息

{

if(xmlHttp.responseText=="false")

{

document.getElementById('cell1').bgColor="green";

document.getElementById('Btnlogin').disabled="";

}

else

{

document.getElementById('cell1').bgColor="red";

document.getElementById('Btnlogin').disabled="false";

}

function createXMLHTTP()

{

if(window.XmlHttpRequest)

{

xmlHttp=new XMLHttpRequest(); //mozilla游览器

}

else if(window.ActiveXObject)

{

try

{

xmlHttp=new ActiveXObject("Msxml2.XMLHTTP"); //IE老版本

}

catch(e)

{}

try

{

xmlHttp=new ActiveXObject("Microsoft.XMLHTTP"); //IE新版本

}

catch(e)

{}

if(!xmlHttp)

{

window.alert("不能创建创建XmlHttpRequest对象!");

return false;

}

静态页面Html代码:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>AJAX登录</title>

</script>

</head>

<tr>

用户名:</td>

</tr>

<tr>

密码:</td>

</tr>

<tr>

</tr>

</table>

</body>

</html>

AJAX回传处理页面代码(DisposeEvent.aspx):

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.Data.SqlClient;

public partial class DisposeEvent : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

Jude();

}

private void Jude()

{

string UserName = Request.QueryString["Name"].ToString();

string con = ConfigurationManager.ConnectionStrings["WebShopConnectionString"].ConnectionString;

SqlConnection dbConnection = new SqlConnection(con);

dbConnection.Open();

SqlCommand cmd = new SqlCommand("select count(*) from Users where userName='" + UserName + "'", dbConnection);

int count = Convert.ToInt32(cmd.ExecuteScalar());

if (count > 0)

{

Response.Write("true");

Response.End();

}

else

{

Response.Write("false");

Response.End();

}

posted on 2007-05-18 19:25 小角色阅读(277) 评论(0) 收藏举报