Javascript instantiate object with variable name

Question

I have a pretty straight forward question, however I can't seem to find a solution for it anywhere...

Basically I would like to instantiate a new Javascript object, but the class name is a variable. In PHP the implementation is fairly straight forward new $className(). I have tried the following solution in Javascript, without luck:

window.onload=function(){
function obj(){
    this.show = function(){
        console.log('Hallo World');
    }
}

var objs = ['obj'];

new objs[0]().show();
}

Does anyone know how to pull this off?

possible duplicate of Instantiate a Class dynamically via variable — ComFreek
– ComFreek, Commented Oct 3, 2013 at 20:56

T.J. Crowder · Accepted Answer · 2013-10-03 20:55:47Z

3

With the code as shown, you can't do it without eval.

If you're willing to change it, you can:

window.onload=function(){
    var things = {
        obj: function(){
            this.show = function(){
                console.log('Hallo World');
            };
        }
    };

    new things['obj']().show();
    // Or: new things.obj().show();
};

answered Oct 3, 2013 at 20:55

T.J. Crowder

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1 Comment

grape_mao Over a year ago

didn't see your answer and posted the same thing...this is correct anyway.

grape_mao · Accepted Answer · 2013-10-03 21:05:15Z

1

Will this help you:

var creator = {
    obj : function (){
        this.show = function(){
        console.log('Hallo World');
        };
    }
}
var myInstance = new creator['obj'];
myInstance.show();

The idea is to define the constructor as a property.

answered Oct 3, 2013 at 21:05

grape_mao

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