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/**
* 初始化一个xmlhttp对象
*/
function InitAjax()
{
var ajax=false;
try {
ajax = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
ajax = new ActiveXObject("Microsoft.XMLHTTP");
} catch (E) {
ajax = false;
}
}
if (!ajax && typeof XMLHttpRequest!='undefined') {
ajax = new XMLHttpRequest();
}
return ajax;
}
///////////////////////////////////////////
function showHint()
{
//获取接受返回信息层
var msg = document.getElementById("txtHint");
//获取表单对象和用户信息值
var f = document.userlogin;
var UserName = f.UserName.value;
var UserAge = f.UserAge.value;
//接收表单的URL地址
var url = "/ajax.php";
//需要POST的值,把每个变量都通过&来联接
var postStr = "&user_name="+ UserName +"&user_age="+ UserAge;
//实例化Ajax
var ajax = InitAjax();
//通过Post方式打开连接
ajax.open("POST", url, true);
//定义传输的文件HTTP头信息
ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
//发送POST数据
ajax.send(postStr);
//获取执行状态
ajax.onreadystatechange = function() {
//如果执行状态成功,那么就把返回信息写到指定的层里
if (ajax.readyState == 4 && ajax.status == 200) {
msg.innerHTML = ajax.responseText;
}
}
}
<?php
//require("class.php");
$UserName=$_post['user_name'];
$UserAge=$_post['user_age'];
//$cd=new controldata();
//$cd->update(&$UserName,&$UserAge,&$con);
$hint=$UserName.$UserAge;
if ($hint == "")
{
$response="no suggestion";
}
else
{
$response=$hint;
}
//output the response
echo $response;
?>
<link rel="stylesheet" type="text/css" href="css.css" />
<script src="ajax.js"></script>
<?php
echo "<form method=post name=userlogin id=userlogin>UserName:<select name=UserName id=UserName><option value=aaa>aaa</option><option value=bbb>bbb</option></select>UserAge:<input type=text name=UserAge id=UserAge><input type=submit value=提交 onclick='showHint()'></form>";
echo "<div id=txtHint style='width:200px; height:30px; background:#ccc;'></div>";
?>