Sending an error message to the users in router with nodejs

Question

The users on my website can change their passwords.

The problem is that when the server produces an error in the process I have to set a warning message and say something like this:

'Warning, the password couldn't be changed, please try again!'

I made two routes in express

app.get('/editMode/:user',ensureAuthUser,routes.user.editMode);
app.get('/editMode/:user/:message',ensureAuthUser,routes.user.editMode);

The first shows the editMode template
The second is supposed to show the editMode and a message from the server

In the editMode.js

var warn=null;
    if(req.params.message) warn=validWarn(req.params.warn) ?JSON.parse(req.params.message) :null;
    console.log('message value: '+req.params.message);
    console.log('warn value: '+warn);

In both cases when I redirect to /editMode/+'[email protected]'+/+'warning message' or /editMode/+'[email protected]' I get

console.log(req.params.message)// value: undefined
console.log(warn)// value: null

Why can't I send a message to the user if my db can't change the password?

EDIT 2

editMode render

return res.render('templates/edit_template,
                            {
                                title: title,
                                usuario: req.session.passport.user,
                                warning: warn || null,
                            })

in the template edit_template.jade

-if(warning && warning.length)
                    h2 Error: #{warning}
                -else
                    h2 success

This looks very hackish, and I think you're actually trying to solve a different problem: that of showing a warning message when an error occurs. Does routes.user.editMode render a template? If so, why not show the message that way? — robertklep
– robertklep, Commented May 6, 2013 at 19:28
the template shows the edit mode... when i change the password i have to redirect to the edit mode again..., how can i show the message by that way? — andrescabana86
– andrescabana86, Commented May 6, 2013 at 19:35

robertklep · Accepted Answer · 2013-05-06 19:39:59Z

1

Since you're using sessions, I would store the warning in the session:

if (theErrorOccurred)
{
  req.session.warning = 'this is your warning message';
}
else
{
  req.session.warning = null;
};
res.redirect('/editMode/...');

And pass it to your template in routes.user.editMode:

return res.render('templates/edit_template', {
  title   : title,
  usuario : req.session.passport.user,
  warning : req.session.warning
});

Also check out connect-flash as a more elaborate way of passing around different types of messages between requests.

answered May 6, 2013 at 19:39

robertklep

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4 Comments

andrescabana86 Over a year ago

what happends with the other session' users

robertklep Over a year ago

sessions are tied to one user only (req.session is unique and only accessible by that user).

andrescabana86 Over a year ago

i have a problem, i discover that when i redirect to the /editMode/ the console.log print two times... like when a process repeat two times... so i print the req.session.warning and before i set warning to null... the console print first print: [Object] second print: null but im redirecting one time

robertklep Over a year ago

@andrescabana86 not entirely sure what you mean (which console.log?); perhaps it warrants a new question (with your new code)?

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