express-notices

Simple notices for Express

The express-notices module provides a simple middleware for throwing high-level error, warning and information messages.

Works best with client-side frameworks (e.g. ScalpelJS).

Installation

Install it:

npm install express-notices

Configure your app to use notices (somewhere above your main router, but below session configuration):

// Your session configuration
// ...
app.use(require('express-notices'));
// ...
app.use(express.router);

This installs notices object into:

• res to use it inside routes
• res.locals to access it in your templates

Usage

In your routes:

app.get('/login', function(req, res, next) {
  res.render('login');
});

app.post('/login', function(req, res, next) {
  // Check password
  if (!valid) {
    res.notices.error('You have entered invalid username and password.');
    res.redirect('/login');
  } else {
    // Authenticate the user
    // ...
  }
})

And in your templates:

// ...
body
  #notices
    each notice in notices.get()
      div(class="notice #{notice.kind}")= notice.msg

Just apply some styling with CSS and you're all set.

More usage

Pass parameters like this:

res.notices.info('Your request have been processed.');
res.notices.warn('The email %s has already been taken.', email);
res.notices.error('Start date %s is greated than end date %s.', startDate, endDate);

Extension

If you aren't satisfied with default notice levels — info, warn and error — you can add more:

app.use(require('express-notices').extend({

  goldAdd: function(amount) {
    return this.add('gold', 'You have earned %s gold coins.', amount);
  },

  goldRemove: function(amount) {
    return this.add('gold', 'You have lost %s gold coins.', amount);
  }

}));

I18N

express-notices uses i18n-2 for formatting your messages. If you don't use it, it just formats string using sprintf.

License

Copyright (C) 2013 Boris Okunskiy boris@okunskiy.name (MIT license)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.