Reuse variable in socket io functions

Question

So now I'm storing info when user submits login form.

io.on('connection', (socket) => {

let userInfo; 

    socket.on('login', (data) => {
        userInfo = data;
        console.log(userInfo); // {username: 'testusername'}
    });

    socket.on('lobby-left', (userInfo) => {
        console.log(userInfo); // { } 
    });

The problem is that in lobby-left I don't get any info from the variable anymore. I get empty brackets { }. How can I reuse the variable so I can use the login info in all functions ?

@AshayMandwarya TY for suggestion, but still getting empty brackets. — zlotte
– zlotte, Commented Jan 15, 2019 at 19:26
You have created a closure to hold userInfo, and then your overriding it with your callback params. Just do -> socket.on('lobby-left', () => { and let your closure work. — Keith
– Keith, Commented Jan 15, 2019 at 19:31
@Keith I even deleted the paremeter but then I get undefined — zlotte
– zlotte, Commented Jan 15, 2019 at 19:39
If login in fired before lobby-left, then you shouldn't be getting undefined. This is basic Javascript closures, and is how I use them with socket.io without issues. There is maybe something else were missing here. — Keith
– Keith, Commented Jan 15, 2019 at 19:41
@Keith Well at first I need to login to website to use any other functions. So it's fired at the begining. — zlotte
– zlotte, Commented Jan 15, 2019 at 19:42

aseferov · Accepted Answer · 2019-01-15 19:37:13Z

1

You need assign it to userInfo

let userInfo; 

socket.on('login', (data) => {
    userInfo = data;
    console.log(userInfo); // {username: 'testusername'}
});

socket.on('lobby-left', (userInfoParam) => {
    console.log(userInfo); // { } 
});

edited Jan 15, 2019 at 19:37

answered Jan 15, 2019 at 19:27

aseferov

6,4133 gold badges20 silver badges24 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

zlotte Over a year ago

Still empty brackets.

aseferov Over a year ago

You need check console.log(userInfoParam). I think event data is empty object

zlotte Over a year ago

I need to reuse same data from login socket, not what I get from lobby-left socket. I don't want to get anything from lobby-left socket, I want to reuse same info from login socket

aseferov Over a year ago

Update my answer. You need change lobby-left callback parametr name, because its same name with userInfo

zlotte Over a year ago

I even deleted the paremeter but then I get undefined

|

Collectives™ on Stack Overflow

Reuse variable in socket io functions

1 Answer 1

6 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

6 Comments

Your Answer

Sign up or log in

Post as a guest

Related