connect-flash-redis

(extends connect-flash )

The flash is a special area of the session used for storing messages. Messages are written to the flash and cleared after being displayed to the user. The flash is typically used in combination with redirects, ensuring that the message is available to the next page that is to be rendered.

This middleware was extracted from Express 2.x, after Express 3.x removed direct support for the flash. connect-flash brings this functionality back to Express 3.x, as well as any other middleware-compatible framework or application. +1 for radical reusability.

It stores all the messages in Redis, so no care if user got multiple 302 redirections or got any unexpected error in packets. It persists until view doesn't read it well.

Great Thanks for initial creators of connect-flash :-)

Install

$ npm install connect-flash-redis

Usage

Express 3.x

Flash messages are stored in the session. First, setup sessions as usual by enabling cookieParser and session middleware. Then, use flash middleware provided by connect-flash.

var app = express();
 
app.configure(function() {
  app.use(express.cookieParser('keyboard cat'));
  app.use(express.session({ cookie: { maxAge: 60000 }}));
  app.use(require('connect-flash')({
      host: 'localhost',
      port: 6379,
      app: app
  }));
});

We need access to the messages in our view. To do so, use this snippet after the initialization.

// This pushes flash messages to your view with the key `flash`
app.locals.flash = req.flash.bind(req);

From version 1.0.1, we are now indexing messages by sessionId, so add this in your main:

app.locals.__csrf = app.locals.__csrf || 'thisismycsrfstringtovalidate';

With the flash middleware in place, all requests will have a req.flash() function that can be used for flash messages.

app.get('/flash', function(req, res){
  // Set a flash message by passing the key, followed by the value, to req.flash().
  req.flash('info', 'Flash is back!')
  res.redirect('/');
});
 
app.get('/', function(req, res){
  res.render('index'});
});

Now, in your view, time to render them. Below example is in .ejs but good enough to understand :-)

<% flash(function(msgs) {
    console.log(msgs);  // Your message here. Do anything with it.
}) %>

Credits

• Hamza Waqas
• Jared Hanson
• TJ Holowaychuk

License

The MIT License

Copyright (c) 2012-2013 Jared Hanson <http://jaredhanson.net/>