javascript 通过 AJAX 调用的 PHP header() 无法正常工作
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/9851792/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
PHP header() called via AJAX not working properly
提问by badcoder
I'm new to web development.
我是网络开发的新手。
Right now I'm working on a login feature on a site. I used Javascript/AJAX to fetch the username and password and send it to a PHP file for verification on the MYSQL database. That's what I'm about to make.
现在我正在研究网站上的登录功能。我使用 Javascript/AJAX 获取用户名和密码并将其发送到 PHP 文件以在 MYSQL 数据库上进行验证。这就是我要做的。
My question is why can't the header() function working properly? I want after the user login she is redirected to the profile page (profile.php)
我的问题是为什么 header() 函数不能正常工作？我想在用户登录后将她重定向到个人资料页面 (profile.php)
Here's snippet of the PHP (login.php):
这是 PHP (login.php) 的片段：
$query = "SELECT * from user WHERE username = '$uname' AND password = md5('$pass');";
$ret = mysql_query($query) or die(mysql_error());
if(!$ret) {
$msg = "Invalid query " . mysql_error() . "\n";
$msg .= "Whole query " . $query;
die($msg);
}
$userid = -1;
while($row = mysql_fetch_array($ret)) {
$userid = $row["ID"];
}
$cnt = mysql_num_rows($ret);
if($cnt == 1) {
session_start();
$_SESSION["userid"] = $userid;
$_SESSION["uname"] = $uname;
echo "You have logged in successfully!";
header("Location: profile.php");
} else {
echo "Wrong Username/Password";
}
And here's for the Javascript (an AJAX function):
这是 Javascript（一个 AJAX 函数）：
var obj;
var url = "login.php";
var params = "uname=" + document.getElementsByName("uname")[0].value + "&pass=" + document.getElementsByName("pass")[0].value;
if(window.XMLHttpRequest) { // Major browsers
obj = new XMLHttpRequest();
obj.open("POST",url,true);
obj.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
obj.setRequestHeader("Content-length", params.length);
obj.setRequestHeader("Connection", "close");
obj.onreadystatechange = function() {
if(obj.readyState == 4) {
if(obj.status == 200) {
// success
} else {
alert("Problem in returned data" + "Error status=" + obj.status);
}
}
}
obj.send(params);
回答by F21
I don't think the redirect will work with AJAX. This is what will happen:
我认为重定向不适用于 AJAX。这是会发生的事情：
- AJAX request is sent to
login.php login.phpsends back a header withLocation: profile.php- The browser then redirects and fetches
profile.php - The results of
profile.phpis then passed to your XMLHttpRequest Object.
- AJAX 请求被发送到
login.php login.php发回一个标头Location: profile.php- 然后浏览器重定向并获取
profile.php profile.php然后将结果传递给您的 XMLHttpRequest 对象。
A way to get the AJAX response to redirect your page is to do this:
获取 AJAX 响应以重定向页面的一种方法是执行以下操作：
The response from
login.phpreturns a JSON response containing the status code (302 or 301) and the location to redirect to.The response itself has a status code of 200 (successful).
The process the JSON response and check the status code for 302 or 301 and redirect to the location.
来自的响应
login.php返回一个 JSON 响应，其中包含状态代码（302 或 301）和要重定向到的位置。响应本身的状态代码为 200（成功）。
处理 JSON 响应并检查 302 或 301 的状态代码并重定向到该位置。
回答by itsmequinn
回答by ncremins
What's happening exactly?
究竟发生了什么？
After header()is called in php, php still executes the rest of the script unless you stick an exit;after the header()call. This is only if you don't want to execute the rest of login.php
之后header()被称为在PHP，PHP，除非你坚持的仍执行脚本的休息exit;后header()调用。这仅在您不想执行其余部分时login.php
回答by Rajesh Mahajan
You can one thing replace your code header("Location: profile.php");by echo "window.location.href='profile.php';and replace your success function as
你可以一件事取代你的代码header("Location: profile.php");通过echo "window.location.href='profile.php';并替换你的成功的功能
if(obj.status == 200) {
eval(obj.responseText);
}
Thats it. now a response will be evaluated by script and will redirect your page on profile.php
而已。现在响应将由脚本评估，并将重定向到 profile.php 上的页面
