Passing 'this' to another object constructor during contruction in JavaScript

Question

Ok so here's my code;

function stdTile(gameObjectargs)
{   
    gameObjectargs.parent=this;
    this.gameObject=new gameObject(gameObjectargs);
}

Basically all I wanna do is pass 'This' to gameObject, so I can refer back to the stdTile when I use new stdTile({}); but for some reason every time I call it its sets gameObject.parent to window any help?

::EDIT::

I dont understand why my code didnt appear but I made a fiddle http://jsfiddle.net/Wjmta/

im not sure what you trying to do, but 1 this is a keyword 2 functions cannot create variable's to be used outside of them, i cantt see your code and dont understand your question, but this may help. — Math chiller
– Math chiller, Commented Sep 15, 2013 at 5:08
Could you explain the way you're trying to access the parent property after instanciation? A code sample would be useful. — user1636522
– user1636522, Commented Sep 15, 2013 at 5:24
just typing my new stdTile object into the console then navigating into the gameObject property, and then to the parent property which is equal to window — Jim Jones
– Jim Jones, Commented Sep 15, 2013 at 5:28
The only way I can reproduce that behavior is omitting the new keyword when attempting to create the stdTile instance. — Simón
– Simón, Commented Sep 15, 2013 at 5:35

Ja͢ck · Accepted Answer · 2013-09-15 05:31:37Z

1

Your code should work as expected; here's an example:

function gameObject(args)
{
    this.parent = args.parent;
    this.args = args;
}

function stdTile(gameObjectargs)
{   
    gameObjectargs.parent=this;
    this.gameObject=new gameObject(gameObjectargs);
}

var tile = new stdTile({});
console.log(tile.gameObject.parent === tile); // true

answered Sep 15, 2013 at 5:31

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Ja͢ck

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3 Comments

user1636522 Over a year ago

I got the same result without changing anything in the original code. I guess the new keyword is missing somewhere... Furthermore, why this variable property (obj.parent.variable)?

Jim Jones Over a year ago

Oh wow, turns out everything was fine except in function gameObject I had this.parent=parent instead of this.parent=args.parent I had no idea parent returned the window object, or is it a keyword? anyways thanks for your help everyone!:)

Jim Jones Over a year ago

obj.parent.variable was just an easy way of shortening down my long code Its actually a collision detection system for a game I'm working on, the gameObjects are sorted through to find which ones collide with certain areas then they're stored in an array and there needs to be a way to tell which object they belong to:)

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