CODEWITHSUNDEEP
javascript
Cubanishe
Cubanishe

Reputation: 15

How to call a function of the owner object

I have several business objects (with different types) that implement functions for a common object, which is assigned to a property of each business object. It is possible to call the functions declared on business objects from the common object?

Hereafter some similar code:

var Percent= function(){
    this.input= null;
    ...
    this.getValuesRange= function(){
        return [min,max];
    }
    ...
}
var Speed= function(){
    this.input= null;
    ...
    this.getValuesRange= function(){
        return [min,max];
    }
    ...
}
var Input= function(){
    this.inputRange= function(){
        //here I need to call owner's getValuesRange function
    }
}
var input= new Input();
var mySpeed= new Speed();
var rocketSpeed= new Speed();
...
mySpeed.input= input;
rocketSpeed.input= input;
...
facade.enter(mySpeed);
facade.enter(rocketSpeed);
...

Upvotes: 0

Views: 373

Answers (2)

Andrea Simone Costa
Andrea Simone Costa

Reputation: 1264

This is possible with some workarounds. Here an example: 

var c = 0;

var Speed= function(){
    var mc = c++;

    var _input = null;
    var _inputRange = null;

    this.getInput= function() {
        var self = this;

        _input.inputRange = function() {
            _inputRange.call(self);
        }

        return _input;
    }

    this.setInput= function(input) {
        _input = input;
        _inputRange = input.inputRange;
    }

    this.getValuesRange= function(){
        console.log("Speed", mc);
    }
}

var Input= function(){
    this.inputRange= function(){
        this.getValuesRange()
    }
}

var input= new Input();
var mySpeed= new Speed();
var rocketSpeed= new Speed();

mySpeed.setInput(input);
rocketSpeed.setInput(input);

mySpeed.getInput().inputRange(); // Speed 0
rocketSpeed.getInput().inputRange(); // Speed 1

There are many possible pitfalls with this solution. It's here only tho give an idea.

Upvotes: 0

T.J. Crowder
T.J. Crowder

Reputation: 1074138

For inputRange on Input to access getValuesRange, it has to have access to an instance of Speed. Your code has to provide it that instance, there's no built-in "what object references this object via a property" operation in JavaScript. (If there were, it would have to allow for the fact multiple objects can reference the same object, as in your example — both Speed instances reference the same Input instance.)

Upvotes: 1

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