viewletter.js

运用JSP/servlet/JavaBean 技术

		var xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");//创建异步通信对象
		function getCurrentMailInfo(url)
		{
			xmlHttp.open("POST", url, true);//打开与servlet的连接
			xmlHttp.onreadystatechange = viewLetterReply;//指定回调函数
			xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
			var data = "operation=viewLetter";//构建参数
			xmlHttp.send(data);//发送请求
		}
		
		function viewLetterReply()
		{
			if(xmlHttp.readyState == 4 && xmlHttp.status == 200)
			{
				var xml = xmlHttp.responseXML;//获取返回的xml对象
				var title = xml.getElementsByTagName("title")[0].firstChild.data;//获得邮件标题
				var whoSended = xml.getElementsByTagName("whosended")[0].firstChild.data;//获得邮件是谁发送的
				var whoReceive = xml.getElementsByTagName("whoreceive")[0].firstChild.data;//获得邮件是谁收的
				var mailContent = xml.getElementsByTagName("content")[0].firstChild.data;//获得邮件的内容
				document.getElementById("mailTitle").innerText = title;
				document.getElementById("whosended").innerText = whoSended;
				document.getElementById("whoreceived").innerText = whoReceive;
				document.getElementById("mailContent").innerText = mailContent;
			}
		}
		
		function turnBeforePage(beforePage)
		{
			parent.document.getElementById("main").src = beforePage;
		}
		
		function replyLetter()
		{
			parent.document.getElementById("main").src = "WriteLetter.html";
		}