所以我是新来的AJAX(不像PHP新),我试图创建一个登录使用AJAX来查询PHP文件。所以,这是我正在尝试使用的代码。我如何使这个AJAX/PHP的工作?
我有三个文件。第一个是login_form.php。它包含登录表单...
<html>
<head>
<title>Log In</title>
<script language="javascript" src="loginsender.js" />
</head>
<body>
<form method="post" name="loginfrm" onsubmit="formValidator()">
<p id="hint"></p>
<label for="username">Username:</label><input type="text" name="username" id="username" />
<label for="password">Password:</label><input type="password" name="password" id="password" />
<input type="submit" name="submit" value="Log In" />
</form>
</body>
</html>
下一个loginsender.js。这是我使用发送到PHP脚本的JavaScript/AJAX文件...
function formValidator()
{
if (document.loginfrm.username.value.length < 3 || loginfrm.password.value.length < 3)
{
msg = "Please enter a valid username/password."
document.getElementById("hint").innerHTML=msg;
}
else
{
if (window.XMLHttpRequest)
{
xmlhttp = new XMLHttpRequest();
}
else
{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function()
{
if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
{
document.getElementById("hint").innerHTML = xmlhttp.responseText;
}
}
}
var params = "username=" + document.loginfrm.username.value + "&password=" + document.loginfrm.password.value;
xmlhttp.open("post", "login.php", true);
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.setRequestHeader("Content-length", params.length);
xmlhttp.setRequestHeader("Connection", "close");
xmlhttp.send(params);
}
最后一个是login.php中,这是我使用来处理实际记录的.. 。
<?php
session_start();
require_once("includes/mysql.inc.php");
require_once("includes/functions.inc.php");
$username = sanitize($_POST['username'], true);
$password = sanitize($_POST['password'], true);
$query = "SELECT * FROM users WHERE username = '$username'";
$result = mysql_query($query);
if (mysql_num_rows($result) != 1) // no such user exists
{
echo 'Sorry, no such user exists';
logout();
die();
}
$userData = mysql_fetch_assoc($result);
$hash = hash('sha256', $userData['salt'] . hash('sha256', $password));
if ($hash == $userData['password'] && $username == $userData['username']) // successful log in
{
validateUser($userData['username']); // set session data
echo '<meta http-equiv="refresh" content="2; url=index.php" />';
}
else
{
echo 'Sorry, but you entered an incorrect username/password.';
logout();
die();
}
?>
总而言之,我们的目标是让用户在输入login_form.php自己的用户名和密码组合,并提交,引发loginsender.js(和formValidator()方法)。然后这将查询PHP登录脚本,该脚本将测试有效的用户/通行组合,然后在会话中设置它(或者,如果登录失败)。问题是,无论我输入什么样的组合,都不会发生任何事情,点击提交后页面会刷新,但就是这样。
**更新1: 我已经编辑了我的login_form页面,我只是将formValidator函数放入脚本中,以便于我查看而不是在文档之间翻转。
我也实施了一些建议。
这就是:
<html>
<head>
<title>Log In</title>
<script type="text/javascript" language="javascript">
function formValidator()
{
if (document.loginfrm.username.value.length < 3 || loginfrm.password.value.length < 3)
{
msg = "Please enter a valid username/password."
document.getElementById("hint").innerHTML=msg;
}
else
{
if (window.XMLHttpRequest)
{
xmlhttp = new XMLHttpRequest();
}
else
{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function()
{
if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
{
document.getElementById("hint").innerHTML = xmlhttp.responseText;
}
}
}
var params = "username=" + document.loginfrm.username.value + "&password=" + document.loginfrm.password.value;
xmlhttp.open("post", "login.php", true);
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.setRequestHeader("Content-length", params.length);
xmlhttp.setRequestHeader("Connection", "close");
xmlhttp.send(params);
}
</script>
</head>
<body>
<p id="hint"></p>
<form method="post" name="loginfrm" onsubmit="formValidator(); return false;">
<label for="username">Username:</label><input type="text" name="username" id="username" />
<label for="password">Password:</label><input type="password" name="password" id="password" />
<input type="submit" name="submit" value="Log In" />
</form>
</body>
</html>
您应修改您的登录。 PHP,你不能通过ajax请求元刷新。在javascript代码块中获得ajax响应后,您必须进行元刷新/页面重定向过程。 – mahadeb
你是什么意思? – Alper