Question

I am validating my form with express-validator…if I have errors, what’s the best way to stop the form from submitting and go back to the login page. This is what I have, which works, just looking for best way to handle this (not sure about the return statement).

//routes/index.js
exports.login.post = function(req, res){
  req.assert('username', 'Please enter username').notEmpty();
  req.assert('password', 'Please enter password').notEmpty();
  res.locals.errors = req.validationErrors(true);

  if ( res.locals.errors ) {
    console.log(res.locals.errors);
    var d = { title: 'Login' };
    res.render('login', { d: d });
    return;
  }

 //do login here if no errors
};

I also do not know how to get at original values in form template (ejs).

I tried passing req.param in, but it is empty.

The err object only has those fields with errors, so if I enter username, but leave password blank, I only get password in err object, not username…so I need req.param.username, but when I pass { q: req.param} and use <%= inspect(q) %> it is empty.

update: req.body gives me the original post parameters to pre-populate the form. so you need err stack and req.body stack to have a good experience.

Answer 1

This is what I do

app.post('/form_process', validateForm, form.handle)
function validateForm(req, res, next) {
  req.assert('username', 'Invalid Username').notEmpty().isAlpha();
  req.assert('password', 'Invalid Password').notEmpty().isAlpha();

  var errors = req.validationErrors();
  if (errors) {
    //res.send(errors,500);
    var original_values = {
      username: req.param('username'),
      password: req.param('password')
    }
    res.render('login', { errorMsg: errors, original: original_values, title: "Login error" })
    return;
  }
  else next()
}