express/examples/form/app.js

/**
 * Module dependencies.
 */

var express = require('../../');

var app = module.exports = express();

// Here we use the bodyDecoder middleware
// to parse urlencoded request bodies
// which populates req.body
app.use(express.bodyParser());
    
// The methodOverride middleware allows us
// to set a hidden input of _method to an arbitrary
// HTTP method to support app.put(), app.del() etc
app.use(express.methodOverride());

// Required by session
app.use(express.cookieParser());

// Required by req.flash() for persistent
// notifications
app.use(express.session({ secret: 'keyboard cat' }));

app.get('/', function(req, res){
  // get ?name=foo
  var name = req.param('name') || '';
  
  // Switch the button label based if we have a name
  var label = name ? 'Update' : 'Save';

  // Buffer all flash messages.
  // Typically this would all be done in a template
  // however for illustration purposes we iterate
  // here.
  
  // The messages in req.flash() persist until called,
  // at which time they are flushed from the session
  var msgs = '<ul>',
      flash = req.flash();
  Object.keys(flash).forEach(function(type){
    flash[type].forEach(function(msg){
      msgs += '<li class="' + type + '">' + msg + '</li>';
    });
  });
  msgs += '</ul>';

  // If we have a name, we are updating,
  // so add the hidden _method input
  res.send(msgs
    + '<form method="post">'
    + (name ? '<input type="hidden" value="put" name="_method" />' : '')
    + 'Name: <input type="text" name="name" value="' + name + '" />'
    + '<input type="submit" value="' + label + '" />'
    + '</form>');
});

app.post('/', function(req, res){
  if (req.body.name) {
    // Typically here we would create a resource
    req.flash('info', 'Saved ' + req.body.name);
    res.redirect('/?name=' + req.body.name);
  } else {
    req.flash('error', 'Error: name required');
    res.redirect('/');
  }
});

app.put('/', function(req, res){
  // Typically here we would update a resource
  req.flash('info', 'Updated ' + req.body.name);
  res.redirect('/?name=' + req.body.name);
});

if (!module.parent) {
  app.listen(3000);
  console.log('Express started on port 3000');
}