JavaScript How to access a variable from an object passed as parameter?

Question

I have a probably really simple problem, but I can't figure it out. I'll post some cut snippets of the code that doesn't work for some reason:

//authentication_handler.js
var new_user = server.authenticated_users.add_user(new User(world));

//user.js
function User(world) {
personBody = createPlayerBody(100, 100, 8, 8, false, true, world);
exports.TheBody = personBody;
}

//player_data_handler.js
module.exports = function(server, client) {
var theUser = server.authenticated_users.find_user(client.uuid);
if (theUser != null) {
    var playerData = JSON.stringify({
        x: theUser.TheBody.position.x, //this line throws the error below
        y: theUser.TheBody.position.y
    });
    server.authenticated_users.each_other(theUser, function(user) {
        server.send_id_message(user.client, 5, playerData);
    });
}
};

The error I get is this:

Cannot read property 'position' of undefined

I'm still pretty new to JavaScript and I don't know why the "personBody" variable doesn't get passed all the way to the "player_data_handler.js". I've tried more approaches but none of them worked. Any help is very much appreciated!!

Alex McMillan · Accepted Answer · 2015-06-06 09:53:57Z

2

exports is used for exporting parts of a module. If you want to add something to your object, use this:

Instead of exports.TheBody = personBody; try this.TheBody = personBody;

edited Jun 6, 2015 at 9:53

answered Jun 6, 2015 at 9:51

Alex McMillan

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2 Comments

Alex McMillan Over a year ago

exports is not an instance of User, which the OP is trying to give the property TheBody.

Royi Namir Over a year ago

I'm sorry I don;t see how new User() has relation with module.exports. can you elaborate ? of course setting this.TheBody with value , will cause any instance of new USer() to has a public property called TheBody , but where module.export comes into the story ?

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