用get的express.js静态html

Question

On the front page of my app, the user can register an account and then login. It is expressed as a login and register button on the front page which then show the appropriate form when either are clicked.

I would like to replace the two buttons with a log out button if the user is already logged in but I need to inform the client of that first.

In my index.js, I am serving static html like so

app.use(express.static('public'));

I thought I could then do the following

app.get('/', function(req, res) {
    // inform the client if req.user isn't null
});

but the callback is never called

Answer 1

Umm! i guess there would be a login/register form so there has to be two routes one with .get() and second one with .post() :

app.get('/', function(req, res) {
    // This is for navigation to the home page
}).post('/', function(req, res){
    // inform the client here about the req.body.user
});

and i guess you have set up this:

app.use(bodyParser.urlencoded({extended:true})); // for "formurlencoded"
app.use(bodyParser.json()); // for "application/json"

if not then you have to load this module require('body-parser') first and require it only if you are using express 4 .

Answer 2

I have found a solution.

In my index.js, I have this

app.get('/isloggedin', function(req, res) {
    res.json({ loggedin: (req.user != null) });
});

And then I can just send a get request for /isloggedin and handle the result

$.get('/isloggedin', {}, function(data) {
    if (!data.loggedin) {
        // remove logged-in only elements
    } else {
        // remove logged-out only elements
    }
});