在嵌套对象中访问parent的属性

Question

I am refactoring some JS code and need to access Objects like

Object1.Object2.IsValid();

this is what I have right now.

function _Object1(object) {

    this._object1 = object;

    this.Object2= new _Object2();

    function IsValid() {
        // tests here
    }
}

function _Object2()
{
    function IsValid() {
        // tests here but needs to use Object1 property above.
    }
}

Only problem being, I am not sure how to access Object1 in Object2 without passing any parameter. Nesting Object2 in Object1, perhaps?

Edit: I am tring to implement OOP in JS, which is like reinventing the wheel, but want to try it for now :)

I will explain the question in terms of OOP:

I have a class _Object1 and it has a method IsValid() . _Object1 also has a property Object2 which is of type _Object2 .

Now, _Object2 also has method named IsValid() . But here is a catch, _Object2.IsValid need the value of _Object1 for tests.

For the above code if I do:

var Object1 = new _Object1();

I can simply call Object1.Object2.IsValid() for the result. Isn't it?

Disclaimer: I have been using JS for sometime now, but never had to dabble with things like these.

Answer 1

Give _Object2 what it needs:

function _Object1(object) {

    this._object1 = object;

    this.Object2= new _Object2(this);

    function IsValid() {
        // tests here
    }
}

function _Object2(parentObject)
{
    function IsValid() {
        // parentObject refers to the _Object1 that created this object
    }
}

Answer 2

I think what you're looking for is impossible, unless you are willing to pass the data in to the object.

Just because your _Object2 instance has been created inside the _Object1 constructor, it does not automatically have any reference to the data of your _Object1 instance. You would have to tell the _Object2 instance about the _Object1 values either in the constructor function or via some other method:

function _Object2(parentObject) { /* ... */ }
// or
_Object2.prototype.setParent = function(parent) { /* ... */}
// or
myObject2.parent = this._object1;