render mobile layouts using express.js

express.mobile.js

// Render mobile views
// if the request is coming from mobile and if you have a view
// with users.mobile.jade, then that view will be rendered
app.use(function (req, res, next) {
  res._render = res.render

  res.render = function (template, locals, cb) {
    var ua = req.header('user-agent')
    var fs = require('fs')

    var view = template + '.mobile.' + app.get('view engine')
    var file = app.get('views') + '/' + view
    
    // check if the request was from the mobile - thanks to https://gist.github.com/christopherdebeer/1200142
    if (/mobile/i.test(ua) && fs.existsSync(file)) {
      res._render(view, locals, cb)
    } else {
      res._render(template, locals, cb)
    }
  }

  next()
})

for implementation details checkout madhums/node-express-mongoose-demo#39