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JavaScript Objects HTML DOM ObjectsJavaScript Window - The Browser Object Model
The Browser Object Model (BOM) allows JavaScript to "talk to" the browser.
The Browser Object Model (BOM)
There are no official standards for the Browser Object Model (BOM).
Since modern browsers have implemented (almost) the same methods and properties for JavaScript interactivity, it is often referred to, as methods and properties of the BOM.
The Window Object
The window object is supported by all browsers. It represent the browsers 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 (of the HTML DOM) is a property of the window object:
window.document.getElementById("header");
is the same as:
document.getElementById("header");
Window Size
Three different properties can be used to determine the size of the browser window (the browser viewport, NOT including toolbars and scrollbars).
For Internet Explorer, Chrome, Firefox, Opera, and Safari:
- window.innerHeight - the inner height of the browser window
- window.innerWidth - the inner width of the browser window
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):
Example
var w=window.innerWidth
|| document.documentElement.clientWidth
|| document.body.clientWidth;
var h=window.innerHeight
|| document.documentElement.clientHeight
|| document.body.clientHeight;
|| document.documentElement.clientWidth
|| document.body.clientWidth;
var h=window.innerHeight
|| document.documentElement.clientHeight
|| document.body.clientHeight;
Try it yourself »
The example displays the browser window's height and width: (NOT including toolbars/scrollbars)
Other Window Methods
Some other methods:
- window.open() - open a new window
- window.close() - close the current window
- window.moveTo() -move the current window
- window.resizeTo() -resize the current window
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