📄 chat.htm
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<title>聊天页面</title>
</head>
<body onload ="sendEmptyRequest()">
<table width="780" border="1" align="center">
<tr>
<td><p align="center">聊天页面</p>
<p align="center">
<textarea id="chatArea" name="chatArea" cols="100" rows="30" readOnly></textarea>
</p>
<div align="center">
<input id="chatMsg" name="chatMsg" type="text" size="90" onKeyPress="enterHandler(event);">
<input type="button" name="button" value="提交" onclick="sendRequest();">
</div>
<p> </p>
</td>
</tr>
</table>
<script>
var input = document.getElementById("chatMsg");
input.focus();
var XMLHttpReq;
//创建XMLHttpRequest对象
function createXMLHttpRequest()
{
if(window.XMLHttpRequest)
{ //Mozilla 浏览器
XMLHttpReq = new XMLHttpRequest();
}
else if (window.ActiveXObject)
{
// IE浏览器
try
{
XMLHttpReq = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e)
{
try
{
XMLHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e)
{
}
}
}
}
//发送请求函数
function sendRequest()
{
var chatMsg = input.value;
createXMLHttpRequest();
var url = "chat.do";
XMLHttpReq.open("POST", url, true);
XMLHttpReq.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
XMLHttpReq.onreadystatechange = processResponse;//指定响应函数
input.value="";
XMLHttpReq.send("chatMsg=" + chatMsg); // 发送请求
}
function sendEmptyRequest()
{
createXMLHttpRequest();
var url = "chat.do";
XMLHttpReq.open("POST", url, true);
XMLHttpReq.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
XMLHttpReq.onreadystatechange = processResponse;//指定响应函数
XMLHttpReq.send(null); // 发送请求
setTimeout("sendEmptyRequest()" , 800);
}
// 处理返回信息函数
function processResponse()
{
if (XMLHttpReq.readyState == 4)
{
// 判断对象状态
if (XMLHttpReq.status == 200)
{
// 信息已经成功返回，开始处理信息
document.getElementById("chatArea").value = XMLHttpReq.responseText;
}
else
{
//页面不正常
window.alert("您所请求的页面有异常。");
}
}
}
function enterHandler(event)
{
var keyCode = event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;
if (keyCode == 13) {
sendRequest();
}
}
</script>
</body>
</html>
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