BOM Window (Browser Object Model)

The Browser Object Model (BOM) allows JavaScript to interact with the web browser and manipulate its behavior. It provides a set of objects and methods that enable JavaScript code to communicate with the browser and perform various actions.

Browser Object Model (BOM)

There are no such official standards for the Browser Object Model (BOM).

As new or modern browsers have implemented (almost) the same methods and properties for JavaScript interactivity and connectivity, it is often referred to, as methods and properties of the BOM.

The Window Object

All browsers support window objects. It represents the browser's window.

All global JavaScript objects, functions, and variables automatically become members of the window object.

Global variables are properties of the window object.

Global functions are methods of the window object.

Even the document object is a property of the window object:

window.document.getElementById("header");

is the same as like:

document.getElementById("header");

Window Size

The two below properties can be used to find the size of the browser window.

Both properties return the sizes in pixels:

window.innerHeight - the inner height of the browser window (in pixels)

window.innerWidth - the inner width of the browser window (in pixels)

Note:- The browser window (the browser viewport) does not include toolbars and scrollbars.

For Internet Explorer 8, 7, 6, 5:

• document.documentElement.clientHeight
• document.documentElement.clientWidth

or

• document.body.clientHeight
• document.body.clientWidth

A practical JavaScript solution (covering all browsers):

The below example displays the browser window's height and width: (NOT including toolbars/scrollbars)

Input:-

Output :-

Other Window Methods

Some other useful methods:

• window.open() – To open a new window
• window.close() – To close the current window
• window.moveTo() – To move the current window
• window.resizeTo() – To resize the current window