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The Window Object


Window Object

The window object represents an open window in a browser.

If a document contain frames (<iframe> tags), the browser creates one window object for the HTML document, and one additional window object for each frame.

Note: There is no public standard that applies to the Window object, but all major browsers support it.


Window Object Properties

Property Description
closed Returns a Boolean value indicating whether a window has been closed or not
defaultStatus Sets or returns the default text in the statusbar of a window
document Returns the Document object for the window (See Document object)
frameElement Returns the <iframe> element in which the current window is inserted
frames Returns all <iframe> elements in the current window
history Returns the History object for the window (See History object)
innerHeight Returns the inner height of a window's content area
innerWidth Returns the inner width of a window's content area
length Returns the number of <iframe> elements in the current window
localStorage Returns a reference to the local storage object used to store data. Stores data with no expiration date
location Returns the Location object for the window (See Location object)
name Sets or returns the name of a window
navigator Returns the Navigator object for the window (See Navigator object)
opener Returns a reference to the window that created the window
outerHeight Returns the outer height of a window, including toolbars/scrollbars
outerWidth Returns the outer width of a window, including toolbars/scrollbars
pageXOffset Returns the pixels the current document has been scrolled (horizontally) from the upper left corner of the window
pageYOffset Returns the pixels the current document has been scrolled (vertically) from the upper left corner of the window
parent Returns the parent window of the current window
screen Returns the Screen object for the window (See Screen object)
screenLeft Returns the horizontal coordinate of the window relative to the screen
screenTop Returns the vertical coordinate of the window relative to the screen
screenX Returns the horizontal coordinate of the window relative to the screen
screenY Returns the vertical coordinate of the window relative to the screen
sessionStorage Returns a reference to the local storage object used to store data. Stores data for one session (lost when the browser tab is closed)
scrollX An alias of pageXOffset
scrollY An alias of pageYOffset
self Returns the current window
status Sets or returns the text in the statusbar of a window
top Returns the topmost browser window

Window Object Methods

Method Description
alert() Displays an alert box with a message and an OK button
atob() Decodes a base-64 encoded string
blur() Removes focus from the current window
btoa() Encodes a string in base-64
clearInterval() Clears a timer set with setInterval()
clearTimeout() Clears a timer set with setTimeout()
close() Closes the current window
confirm() Displays a dialog box with a message and an OK and a Cancel button
createPopup() Creates a pop-up window
focus() Sets focus to the current window
getComputedStyle() Gets the current computed CSS styles applied to an element
getSelection() Returns a Selection object representing the range of text selected by the user
matchMedia() Returns a MediaQueryList object representing the specified CSS media query string
moveBy() Moves a window relative to its current position
moveTo() Moves a window to the specified position
open() Opens a new browser window
print() Prints the content of the current window
prompt() Displays a dialog box that prompts the visitor for input
resizeBy() Resizes the window by the specified pixels
resizeTo() Resizes the window to the specified width and height
scroll() Deprecated. This method has been replaced by the scrollTo() method.
scrollBy() Scrolls the document by the specified number of pixels
scrollTo() Scrolls the document to the specified coordinates
setInterval() Calls a function or evaluates an expression at specified intervals (in milliseconds)
setTimeout() Calls a function or evaluates an expression after a specified number of milliseconds
stop() Stops the window from loading