Question

61

JavaScript class - Call method when object initialized

rated 0 times [ 66] [ 5] / answers: 1 / hits: 72728 / 14 Years ago, thu, august 19, 2010, 12:00:00

I have a class similar to the one below. How do I call my init method when the object is created? I don't want to have to create an instance of my object then call initialize like I do below.

var myObj = new myClass(2, true);

myObj.init();



function myClass(v1, v2) 

{

    // public vars

    this.var1 = v1;



    // private vars

    var2 = v2;



    // pub methods

    this.init = function() {

        // do some stuff        

    };



    // private methods

    someMethod = function() {

        // do some private stuff

    };

}

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answered 14 Years ago iselauniquef · Accepted Answer

NB. Constructor function names should start with a capital letter to distinguish them from ordinary functions, e.g. MyClass instead of myClass.

Either you can call init from your constructor function:

var myObj = new MyClass(2, true);



function MyClass(v1, v2) 

{

    // ...



    // pub methods

    this.init = function() {

        // do some stuff        

    };



    // ...



    this.init(); // <------------ added this

}

Or more simply you could just copy the body of the init function to the end of the constructor function. No need to actually have an init function at all if it's only called once.