Reaching an object property from another property

Question

I'm using an object structure for my js file and want to be able to assign one of the properties (which is an array) to one of the other properties:

AvGen = {

    theBody: {
        bodies: [
            fooObj,
            foo2Obj,   // <--- assign this property...
            foo3Obj
        ],
        bodyColor: '#DB6EDB',
        currBodyNr: 1,
        currBodyObj: AvGen.theBody.bodies[1]    // <--- ...to this property

// ... rest of the code

However, when trying to do it I get the following error message:

Uncaught ReferenceError: AvGen is not defined

If I remove 'AvGen' it says that 'theBody' isn't defined instead. How can I accomplish this?

x= foo2Obj, then currBodyObj: x, ... – dandavis Jun 18 '13 at 20:33 — dandavis, Jun 18 '13 at 20:33

score 1 · Answer 1 · answered Jun 18 '13 at 20:46

In newer browsers you could use a getter:

AvGen = {

    theBody: {
        bodies: [
            1,
            2,
            3
        ],
        bodyColor: '#DB6EDB',
        currBodyNr: 1,
        get currBodyObj() {
           return AvGen.theBody.bodies[AvGen.theBody.currBodyNr];
        }
    }
}

console.log(AvGen.theBody.currBodyObj); //2

FIDDLE

But you could also just use a method instead of a property:

currBodyNr: 1,
currBodyObj: function() {
   return AvGen.theBody.bodies[AvGen.theBody.currBodyNr];
}

//...

console.log(AvGen.theBody.currBodyObj()); //2

score 0 · Answer 2 · answered Jun 18 '13 at 20:33

0

You'd have to initialize the object AvGen first so that it takes the set values of bodies and then, through a function assign the one you want to this.currBodyObj.

answered Jun 18 '13 at 20:33

Giovanni Di Toro

797
1
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34

score 0 · Answer 3 · answered Jun 18 '13 at 20:43

Avgen isn't instantiated yet on that line. Instead, do this:

AvGen = {};
AvGen.theBody = {};
AvGen.theBody.bodies = [fooObj, foo2Obj, foo3Obj];
AvGen.theBody.bodyColor = '#DB6EDB';
AvGen.theBody.currBodyNr = 1;
AvGen.theBody.currBodyObj = AvGen.theBody.bodies[1];
// etc..

Reaching an object property from another property

3 Answers3