我刚学Ajax不久,所以写了一个简单的例子,但是为什么send_request(url)这个函数不执行呀为什么,同志们帮我看看
下面是源代码:
<%@ page language="java" contentType="text/html;charset=GB2312" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>session 应用实例</title>
<script language="JavaScript">
var http_request = false;
function send_request(url)
{
alert("1");
if(window.XMLHttpRequest)
{
http_request = new XMLHttpRequest();
if(http_request.overrideMimeType)
{
http_request.overrideMimeType("text/html");
}
}
else if(window.ActiveXObject)
{
try
{
http_request = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e)
{
try
{
http_request = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e)
{
}
}
}
if(!http_request)
{
window.alert("不能创建XML对象!");
return false;
}
http_request.onreadystatechange = processRequest;
http_request.open("get",url,true);
http_request.send(null);
}
function processRequest()
{
if(http_request.readState == 4)
{
if(http_request.status== 200)
{
window.alert(http_request.responseText);
}
else
{
window.alert("你所请求的页面有异常!");
}
}
}
</script>
<script language="JavaScript">
function userCheck()
{
var f = document.form1;
var username = f.username.value;
if(username=="") {
window.alert("用户名不能为空!");
f.username.focus();
return false;
}
else {
send_request("AjaxTestcheck.jsp?username="+username);
} }
</script>
</head>
<body>
<form name="form1" action="" method="post">
用户名:<input type="text" name="username" value="">
<input type="button" name="check" value="唯一性检查" onClick="javascript:userCheck()">
<input type="submit" name="submit" value="提交">
</form>
</body>
</html>
有做过的吗?看看。。
下面是源代码:
<%@ page language="java" contentType="text/html;charset=GB2312" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>session 应用实例</title>
<script language="JavaScript">
var http_request = false;
function send_request(url)
{
alert("1");
if(window.XMLHttpRequest)
{
http_request = new XMLHttpRequest();
if(http_request.overrideMimeType)
{
http_request.overrideMimeType("text/html");
}
}
else if(window.ActiveXObject)
{
try
{
http_request = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e)
{
try
{
http_request = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e)
{
}
}
}
if(!http_request)
{
window.alert("不能创建XML对象!");
return false;
}
http_request.onreadystatechange = processRequest;
http_request.open("get",url,true);
http_request.send(null);
}
function processRequest()
{
if(http_request.readState == 4)
{
if(http_request.status== 200)
{
window.alert(http_request.responseText);
}
else
{
window.alert("你所请求的页面有异常!");
}
}
}
</script>
<script language="JavaScript">
function userCheck()
{
var f = document.form1;
var username = f.username.value;
if(username=="") {
window.alert("用户名不能为空!");
f.username.focus();
return false;
}
else {
send_request("AjaxTestcheck.jsp?username="+username);
} }
</script>
</head>
<body>
<form name="form1" action="" method="post">
用户名:<input type="text" name="username" value="">
<input type="button" name="check" value="唯一性检查" onClick="javascript:userCheck()">
<input type="submit" name="submit" value="提交">
</form>
</body>
</html>
有做过的吗?看看。。
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<head></head>
<body>
<form name="form1" action="" method="post">
用户名:<input type="text" name="username" value="">
<input type="button" name="check" value="唯一性检查" onClick="userCheck()">
<input type="submit" name="submit" value="提交">
</form>
</body>
</html><script language="javascript">
var http_request = false;function send_request(url) {//初始化、指定处理函数、发送请求的函数
http_request = false;
//开始初始化XMLHttpRequest对象
if(window.XMLHttpRequest) { //Mozilla 浏览器
http_request = new XMLHttpRequest();
if (http_request.overrideMimeType) {//设置MiME类别
http_request.overrideMimeType('text/xml');
}
}else if (window.ActiveXObject) { // IE浏览器
try {
http_request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
http_request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
}
}
if (!http_request) { // 异常,创建对象实例失败
window.alert("不能创建XMLHttpRequest对象实例.");
return false;
}
http_request.onreadystatechange = processRequest;
// 确定发送请求的方式和URL以及是否同步执行下段代码
http_request.open("GET", url, true);
http_request.send(null);
}// 处理返回信息的函数
function processRequest() {
if (http_request.readyState == 4) { // 判断对象状态
if (http_request.status == 200) { // 信息已经成功返回,开始处理信息
alert(http_request.responseText);
} else { //页面不正常
alert("您所请求的页面有异常。");
}
}
}
function userCheck() {
var f = document.form1;
var username = f.username.value;
if(username=="") {
window.alert("用户名不能为空。");
f.username.focus();
return false;
}
else {
send_request('sample1_2.jsp?username='+username);
}
}
</script>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
<script language="javascript">
var http_request = false;
function send_request(url) {//初始化、指定处理函数、发送请求的函数
http_request = false;
//开始初始化XMLHttpRequest对象
if(window.XMLHttpRequest) { //Mozilla 浏览器
http_request = new XMLHttpRequest();
if (http_request.overrideMimeType) {//设置MiME类别
http_request.overrideMimeType('text/xml');
}
}
else if (window.ActiveXObject) { // IE浏览器
try {
http_request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
http_request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
}
}
if (!http_request) { // 异常,创建对象实例失败
window.alert("不能创建XMLHttpRequest对象实例.");
return false;
}
http_request.onreadystatechange = processRequest;
// 确定发送请求的方式和URL以及是否同步执行下段代码
http_request.open("GET", url, true);
http_request.send(null);
}
// 处理返回信息的函数
function processRequest() {
if (http_request.readyState == 4) { // 判断对象状态
if (http_request.status == 200) { // 信息已经成功返回,开始处理信息
alert(http_request.responseText);
} else { //页面不正常
alert("您所请求的页面有异常。");
}
}
}
function userCheck() {
var f = document.form1;
var username = f.username.value;
if(username=="") {
window.alert("用户名不能为空。");
f.username.focus();
return false;
}
else {
send_request('ajax2.jsp?username='+username);
}
}
</script>
<link href="css/style.css" rel="stylesheet" type="text/css">
</head><body>
<form name="form1" action="" method="post">
用户名:<input type="text" name="username" value="">
<input type="button" name="check" value="唯一性检查" onClick="userCheck()">
<input type="submit" name="submit" value="提交">
</form>
<!--span style="cursor: pointer; text-decoration: underline" onclick="send_request('2.jsp?username=educhina')">Send a request</span-->
</body>
</html>
你的很好用,但是我想知道我的为什么错了,,好象没什么错误呀。。
window.alert("用户名不能为空!");的符号是中文的。