node.js ExpressJS 3.0 如何将 res.locals 传递给玉石视图？
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ExpressJS 3.0 How to pass res.locals to a jade view?
提问by aeyang
I want to display a flash message after a user fails to sign in but I just can't get the variables to show up in my Jade views.
我想在用户登录失败后显示一条 Flash 消息，但我无法让变量显示在我的 Jade 视图中。
I have some pieces, I know I have to use this in my app.configure():
我有一些片段，我知道我必须在 app.configure() 中使用它：
app.use (req, res, next) ->
res.locals.session = req.session
And I'll set what the flash message is after the user POSTS the wrong password:
在用户发布错误密码后，我将设置 Flash 消息的内容：
exports.postSession = (req, res) ->
users = require '../DB/users'
users.authenticate(req.body.login, req.body.password, (user) ->
if(user)
req.session.user = user
res.redirect(req.body.redirect || '/')
else
req.session.flash = 'Authentication Failure!'
res.render('sessions/new', {title:'New', redirect: req.body.redirect })
)
I don't know how to access res.locals.sessionin my Jade file. I doubt I am setting everything up right. This question is a lot like this one: Migrating Express.js 2 to 3, specifically app.dynamicHelpers() to app.locals.use?but I still can't get it to work. It would be much appreciated if someone could show me just a simple example of setting values in res.local and accessing them in a view.
我不知道如何访问res.locals.session我的 Jade 文件。我怀疑我是否正确设置了一切。这个问题很像这样一个：Migrating Express.js 2 to 3,特别是app.dynamicHelpers() to app.locals.use? 但我仍然无法让它工作。如果有人能向我展示一个在 res.local 中设置值并在视图中访问它们的简单示例，我将不胜感激。
p.s. I do know about connect-flash but I need to understand how to make things available in views.
ps 我确实知道连接闪存，但我需要了解如何在视图中提供可用的东西。
This is my app:
这是我的应用程序：
app.configure(() ->
app.set('views', __dirname + '/views')
app.set('view engine', 'jade')
app.use(express.bodyParser())
app.engine('.jade', require('jade').__express)
app.use(express.methodOverride())
app.use(express.cookieParser())
app.use(express.session({ store: new express.session.MemoryStore({reapInterval: 50000 * 10}), secret: 'chubby bunny' }))
app.use(express.static(__dirname + '/public'))
app.use((req, res, next) ->
res.locals.session = req.session
next()
)
app.use(app.router)
)
回答by zemirco
Just to give a short summary for everyone who has the same problem and got the impression that is was solved changing res.redirect.
只是为了给每个有同样问题并得到解决的印象的人做一个简短的总结res.redirect。
It is very important to put your app.usemiddleware beforeapp.router. See the comments by TJ Holowaychuck, the author of express
它是把你的非常重要app.use的中间件之前app.router。请参阅 express 的作者 TJ Holowaychuck 的评论
Here is an example using a fresh installation of express v3.0.0rc4
这是一个使用 express v3.0.0rc4 全新安装的示例
app.js:
应用程序.js：
app.use(function(req, res, next){
res.locals.variable = "some content";
next();
})
app.configure(function(){
app.set('port', process.env.PORT || 3000);
app.set('views', __dirname + '/views');
app.set('view engine', 'jade');
app.use(express.favicon());
app.use(express.logger('dev'));
app.use(express.bodyParser());
app.use(express.methodOverride());
app.use(app.router);
app.use(express.static(path.join(__dirname, 'public')));
});
index.jade:
index.jade：
extends layout
block content
h1= title
p Welcome to #{title}
p= variable
回答by Adam Albright
If you are using express.session() you must call your function AFTERexpress.session()but BEFOREapp.router, inside of app.configure().
如果您正在使用express.session（），则必须调用函数后express.session（） ，但前app.router，app.configure内（）。
app.js
应用程序.js
app = express();
app.configure(function(){
app.set('port', process.env.PORT || 3000);
app.set('views', __dirname + '/views');
app.set('view engine', 'jade');
app.use(express.logger('dev'));
app.use(express.bodyParser());
app.use(express.methodOverride());
app.use(express.session());
// Give Views/Layouts direct access to session data.
app.use(function(req, res, next){
res.locals.session = req.session;
next();
});
app.use(app.router);
app.use(express.static(path.join(__dirname, 'public')));
});
index.jade
索引.jade
extends layout
block content
h1= title
p My req.session.var_name is set to #{session.var_name}
