Question

My problem is that i want to create object of model in javascript .I use backbone.js
I want to share model object globally because I need that object in many js files

 (function(){
     this.mymodel=Backbone.Model.extend({
            ----
            ----
     });
  return{
            var colobj = new mymodel;
  }
})

and I am sharing “colobj” object in another js file as follows

(function(){
     var collectionobj = new colobj;
 });

but this gives me error what is wrong in this example

Answer 1

First of all, you should change this line :

var colobj = new mymodel;

to

var colobj = new this.mymodel;

The thing is that mymodel was undefined and that may have been the roots of your problem.

In addition, your first colobj is an instance of your model, thus it is an object and not a constructor. That’s why the second time you try to instantiate it :

var collectionobj = new colobj;

it throws an error, because the browser thinks you’re doing something like :

var collectionobj = new (new mymodel);

I suggest you pass only the model definition the from one closure to another:

//...
return{
        var colobj = this.mymodel;
}
//...

UPDATE
I’m very surprised to see that I’ve missed this before.
You are returning an invalid object :

{var colobj = new mymodel;}

I think that you probably meant to return an object that hash a colobj property with the value of your model. If that’s the case, all you have to do is return this object :

{colobj : this.mymodel};