Ajax的简单用例
来源：互联网 发布：人工智能 小孩 编辑：程序博客网 时间：2024/05/18 00:43
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!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 runat="server">
<title>Untitled Page</title>
<link href="StyleSheet.css" rel="stylesheet" type="text/css" />
<script language="javascript" type="text/jscript">
//检测浏览器,创建xmlhttp-request对象
function getXMLRequester()
...{
var xmlhttp_request = false;
try
...{
if(window.ActiveXObject)
...{
for(var i = 5;i;i--)
...{
try
...{
if(i==2)
...{
xmlhttp_request = new ActiveXObject("Microsoft.XMLHTTP");
}
else
...{
xmlhttp_request = new ActiveXObject("Msxml2.XMLHTTP" +i+"0");
xmlhttp_request.setRequestHeader("Content-Type","text-xml");
xmlhttp_request.setRequestHeader("Content_Type","gb2312");
}
break;
}
catch(e)
...{
xmlhttp_request=false;
}
}
}
else if(window.XMLHttpRequest)
...{
xmlhttp_request = new XMLHttpRequest();
if(xmlhttp_request.overrideMineType)
...{
xmlhttp_request.overrideMineType("text/xml");
}
}
}
catch(e)
...{
xmlhttp_request = false;
}
return xmlhttp_request;
}
function IDRequest(n)
...{
url = n + document.getElementById("txtUserID").value;//定义网址参数
xmlhttp_request = getXMLRequester();
xmlhttp_request.onreadystatechange = doContents;//调用doContent函数;
xmlhttp_request.open("Get",url,true);
xmlhttp_request.send(null);
}
function doContents()
...{
if(xmlhttp_request.readyState == 4)//收到完整的服务器响应
...{
if(xmlhttp_request.status == 200)//Http服务器响应ok
document.getElementById("message").innerHTML = xmlhttp_request.responseText;//服务器响应的值
else
alert(http_request.status);
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input type="text" id="txtUserID" style="font-size:12px;" />
<input type="button" id="btnOk" value="校验" style="font-size:12px" onclick ="IDRequest('http://reg.163.com/register/checkssn.jsp?username=')" />
<div id="message"></div>
</div>
</form>
</body>
</html>
