Meena's Class Prints: WINDOW OBJECT IN JAVASCRIPT

The window object represents an open window in a browser.
It is the top-level object in the JavaScript hierarchy.
All top-level properties and methods such as alert(), prompt(), parseInt() belongs to the window object. The window object is also the default object. That is, alert() is the same as window.alert().
A window object is created automatically with every <body> or <frameset> tag.
The window object is supported by all browsers. It represent 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 (of the HTML DOM) is a property of the window object:

window.document.getElementById("header");

is same as document.getElementById("header");

Window Size

Three different properties can be used to determine the size of the browser window

For Internet Explorer, Chrome, Firefox, Opera, and Safari:

For Internet Explorer 8, 7, 6, 5:

Example:

<html>

<body>

var w = window.innerWidth

|| document.documentElement.clientWidth

|| document.body.clientWidth;

var h = window.innerHeight

|| document.documentElement.clientHeight

|| document.body.clientHeight;

var x = document.getElementById("demo");

x.innerHTML = "Browser inner window width: " + w + ", height: " + h + ".";

</script>

</body>

</html>

WINDOW METHODS:

Some methods: