How to use 'this' in nested object?

This question already has an answer here:

Javascript “this” pointer within nested function 7 answers

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If not works this way. The self technic is a closure and it should be defined in the same function as being used. For example:

function myFunc() {
     var self = this;
     anotherFuncWithCallback( function() { self.myValue = this.valueFromOtherContext; });
}

You can't bind this to your method the way you want. If you have bind problems, you need to change your method call:

myObject.myMethod.bind(myObject)("parameters");

It will bind the right object to this before calling your method.

By the way, you can change your class defintion to this:

var LayoutConstructor = function() {

  var self = this;

  this.newsroom = {
        buildSidebar: function() {
            //some code...
            //get the error: Cannot read property 'buildBoxWrapper' of undefined
            self.general.buildBoxWrapper($(".sidebar .box-wrapper"));
        }
    };

  this.buildNewsroom = function() {
        this.newsroom.buildSidebar();
  };



  this.general = {

        // Build the box-wrapper
        buildBoxWrapper: function(boxWrapper) {
            //some code...
        }
    }
}

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