javascript 在 res.redirect 上传递变量
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Passing variables on res.redirect
提问by codephobia
Is there an easy way to pass a variable with a res.redirect in node.js / express without having to append it to the URL, or store it in a cookie, or session variable?
是否有一种简单的方法可以在 node.js / express 中传递带有 res.redirect 的变量，而无需将其附加到 URL，或将其存储在 cookie 或会话变量中？
Why do I want to do this? Here is an example:
我为什么要这样做？下面是一个例子：
Let's say I have a users page at /users. And I can add users at the page /users/add. I post the form at /users/add, if it has errors it reloads that form with the error messages, if it goes through successfully, it redirects back to the /users page. What I want is the ability to know I just added a user and show a success message for it.
假设我在 /users 有一个用户页面。我可以在页面/users/add 添加用户。我将表单发布在 /users/add，如果它有错误，它会重新加载带有错误消息的表单，如果它成功通过，它会重定向回 /users 页面。我想要的是能够知道我刚刚添加了一个用户并为其显示成功消息。
Here is an example of a post:
下面是一个帖子的例子：
exports.usersAddPost = function(req, res, next) {
// validate form
if (!validated) {
// go back to form
return res.render('users/add', req.body.whatever);
} else {
// go back to users list
// need some way to tell users page that a user was just added
return res.redirect('users');
}
};
回答by codephobia
I actually decided to use sessions since I found a nice way to do it fairly elegantly.
我实际上决定使用会话，因为我找到了一种相当优雅的好方法。
Before the redirect I set the session like so:
在重定向之前，我像这样设置会话：
req.session['success'] = 'User added successfully';
res.redirect('users');
And on the users page I check for a success variable and pass that to my template if it exists, and then to reset it I just set it to null. This works perfectly for what I need.
在用户页面上，我检查成功变量并将其传递给我的模板（如果存在），然后重置它我只是将它设置为 null。这非常适合我的需要。
回答by Jaime Gómez
If you can use javascript, you could use the http referer and assume a user was just added, since according to your workflow that's the only way it could happen:
如果您可以使用 javascript，则可以使用 http 引用器并假设刚刚添加了一个用户，因为根据您的工作流程，这是唯一可能发生的方式：
document.referrer == "/users/add"
回答by mscdex
What about just displaying simple html with a meta refresh? Example:
只显示带有元刷新的简单 html 怎么样？例子：
function redirectFlash(url, timeout, msg) {
var defaultTimeout = 5;
if (typeof timeout === 'string') {
msg = timeout;
timeout = defaultTimeout;
} else if (timeout === undefined) {
msg = '';
timeout = defaultTimeout;
}
return '<html><head><title>Redirecting ...</title><meta http-equiv="refresh" content="'
+ timeout
+ ';url='
+ url
+ '"></head><body>'
+ msg
+ '<br /><a href="'
+ url
+ '">Click here to return manually</a></body></html>';
}
exports.usersAddPost = function(req, res, next) {
// validate form
if (!validated) {
// go back to form
return res.render('users/add', req.body.whatever);
} else {
// go back to users list
// need some way to tell users page that a user was just added
return res.end(redirectFlash('/users', 'User added successfully. Returning you to the user list ...'));
}
};
