Question

if( !sky.containers ) sky.containers =
{
        Window : function()
        {
                this.element = document.createElement("div");
                this.element.modal = false; 
                this.element.height = 240;
                this.element.draggable = true;
                this.element.resizable = true;
                this.element.position = "center";
                this.element.width = 240;
                this.element.target = document.body;
                this.element.title ="";
                this.element.headerHeight = 30;;
                this.element.effects = {};
                this.element.show = function()





                return this.element;

        }}

What is the keyword THIS in this context?”sky.containers” or “Window”?And what is ELEMENT,if theres no variable define whit this name?

Answer 1

Window() is a constructor function. That means it gets called when you create a new object with something like

var myWin = new Window();

Inside the function, this will refer to the new object that was just created. (And which gets assigned to myWin in the above example call.)

As for ‘element’, it’s a property of the newly-created object. It doesn’t exist until this line:

this.element = document.createElement("div");

Which creates a new <div> element and assigns the DOM representation of it to the property.