Question

78

Javascript how to override a constructor method?

rated 0 times [ 84] [ 6] / answers: 1 / hits: 10264 / 9 Years ago, mon, january 25, 2016, 12:00:00

I have a View class that has a constructor method initialize I think this is a constructor method, correct me if wrong.

var View = function(obj) {

    this.initalize = obj.initalize;

};

What I would like to achieve is something gets called when the Class is instantiated.

How can I pass in an object like so?

var chatView = new View({

    initialize: function() {

        alert('Yay for initialization');

    }

});

So that when I instantiate the View I can pass an object to the constructor and within a key initialize which value is a function and this key specifically gets called when instantiated.

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freddiej

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2 Years ago

answered 9 Years ago eddiejoshb · Accepted Answer

If I get it right, there is a simple way of achieving what you want:

var View = function(obj) {

    obj.initialize();

}

This way, the initialize function gets called whenever you instantiate a View class.

Be aware that if you want to do real initialization code inside the initialize function to work, you could use call (or apply):

var View = function(obj) {

    if (typeof obj.initialize === 'function') {

        obj.initialize.call(this);

    }

}



var chatView = new View({

    initialize: function() {

        this.property = 'property';

    }

});



console.log(chatView.property); // outputs property