ExpressJS 3.0如何将res.locals传递给玉视图？

Question

我希望在用户登录失败后显示flash消息,但我无法让我的Jade视图中显示变量.

我有一些部分,我知道我必须在我的app.configure()中使用它:

    app.use (req, res, next) ->
      res.locals.session = req.session

我会在用户输入错误密码后设置flash消息:

     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 })
      )

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一切.这个问题很像这个:将Express.js 2迁移到3,特别是app.dynamicHelpers()到app.locals.use？但我仍然无法让它发挥作用.如果有人能给我看一个在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.

ps我确实知道connect-flash但我需要了解如何在视图中提供可用的东西.

这是我的应用:

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)
)

Answer 1

只是为每个遇到相同问题的人做一个简短的总结,并得到解决后的变化res.redirect.

以前放置app.use中间件非常重要.请参阅快递作者TJ Holowaychuck的评论 app.router

• https://groups.google.com/d/msg/express-js/72WPl2UKA2Q/dEndrRj6uhgJ

以下是使用express v3.0.0rc4的全新安装的示例

app.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:

extends layout

block content
  h1= title
  p Welcome to #{title}
  p= variable

Answer 2

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

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

extends layout

block content   
  h1= title   
  p My req.session.var_name is set to #{session.var_name}