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Ajax简单应用,检测用户名是否存在 (转）

2008-01-24 19:53 645 查看

客户端页面index.html

<!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>

<title>ajax测试</title>

<script language="javascript" type="text/javascript">

//生成Http请求对象，用于客户端向服务/端发送异步的http请求

function getHttpObject()

{

var http;

var browser = navigator.appName;

if(browser == "Microsoft Internet Explorer")

{

//如果用户使用IE，就返回XMLHTTP的ActiveX对象

http = new ActiveXObject("MSXML2.XMLHTTP.3.0");

}

else

{

//否则返回一个XMLHttpRequest对象

http = new XMLHttpRequest();

}

return http;

}

//获取全局的HTTP请求对象

var http = getHttpObject();

//处理请求状态变化

function getHello()

{

//4表示请求已完成

if (http.readyState == 4)

{

//获取服务段的响应文本

var helloStr = http.responseText;

alert(helloStr);

if(helloStr.charAt(0)!="0")

{alert("用户名已经存在!");}

else

{alert("用户名不存在,可以实用!");}

}

}

function HelloWorld()

{

var url = "Check.aspx?id="+document.getElementById("Text1").value;

//指定服务端的地址

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

//请求状态变化时的处理函数

http.onreadystatechange = getHello;

//发送请求

http.send(null);

}

</script>

</head>

<body>

<input id="Text1" style="width: 116px" type="text" />

<input id="Button1" type="button" value="button" onclick="javascript:HelloWorld();" />

</body>

</html>

服务器端功能页面Check.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 Check : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

string str = "select Count(*) from Table where Name=" + Request.QueryString["id"].ToString() + "";

SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=Database;Integrated Security=True");

conn.Open();

SqlCommand cmd = new SqlCommand(str, conn);

int i = (int)cmd.ExecuteScalar();

conn.Close();

Response.Write(i);

}

}

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