socket.io: How to emit an Array and a Variable simultaneously

Question

Learning Node.js, Express.js and Socket.io.

Made a Chat an it works so far.

Now I would like to emit to the Client, that a user has entered or left the chat by emiting a variable that indicates that...

Ist that possible?

So something like this:

Server.js

var users = [];
var inout;
function updateUsers(){
    io.emit('users', users, 'inout', inout);
}

Client:

var socket = io.connect( 'http://'+window.location.hostname+':3000' );
    socket.on('users', function(data){

// how to get the 'inout' here? }

Thanks for any Help... ;)

You ;) don't ;) need ;) all ;) those ;) winky ;) faces ;). (ps, this might be of help.) — Darren
– Darren, Commented Nov 1, 2016 at 0:18
Oh no! Where did all my smilies go? ;O I like to show my emotions.. hehe ;) — bernd pfeffer
– bernd pfeffer, Commented Nov 1, 2016 at 7:52

Paul Rumkin · Accepted Answer · 2021-09-27 17:43:37Z

4

The simplest way is to emit object:

let users = []
let inout

function updateUsers() {
    io.emit('users', {users, inout});
}

edited Sep 27, 2021 at 17:43

answered Nov 1, 2016 at 0:25

Paul Rumkin

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2 Comments

bernd pfeffer Over a year ago

Arghh... so simple... Thanks... and for all noob proggers like me: on client side you then obviously have to separate these two objects in "data.users" and "data.inout"... thank you very much, Pasha :)

Paul Rumkin Over a year ago

You're welcome. On the client you can destructure data object socket.on('users', ({users, inout}) => { /* ... */ })

RobertAKARobin · Accepted Answer · 2016-11-01 00:49:12Z

0

I think you need to read the documentation more clearly, because this doesn't look like Socket.io.

Here's an example of sending an array, along with some other data:

var io = require("socket.io")(3001);
io.emit("myEvent", {
  somethingToSendToBrowser: "Hello",
  arrayToSendToBrowser: [
    "I'm the data that will get sent.",
    "I'm some more data.",
    "Here's the third piece of data."
  ]
});

<script src="/node_modules/socket.io-client/socket.io.js"></script>
<script>
var socket = io("http://localhost:3001");
socket.on("myEvent", function(data){
  console.log(data.arrayToSendToBrowser);
  // ["I'm the data that will get sent.", "I'm some more data.", "Here's the third piece of data.]"
});
</script>

edited Nov 1, 2016 at 0:49

answered Nov 1, 2016 at 0:24

RobertAKARobin

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1 Comment

bernd pfeffer Over a year ago

Thank you Robert, seems to be the same working solution as Pasha proposed.. :)

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