Window Object

• Window object represents the browser’s window or potentially frame, that a document is displayed in.
• As long as a browser window is open, even if no document is loaded in the window, the window object is defined in the current model in memory.
• All global JavaScript variables, functions and objects automatically become members of the window object.

Dialog boxes

It is used to provide some information to users.

Type of Dialog box:-

• Alert
• Confirm
• Prompt

alert ( ) Method

This Window object’s method is used to display data in the alert dialog box. alert really should be used only when you truly want to stop everything and let the user know something.

Syntax:- window.alert( ) or alert ( )

confirm ( ) Method

This Window object’s method is used to display a message for a user to respond to by pressing either an OK button to agree with the message to a Cancel button to disagree with the message. It returns true on OK and false on Cancel.

Syntax:- window.confirm( ) or confirm ( )

prompt ( ) Method

Window object’s method prompt() can be used to get input from the user, named prompt. The prompt( ) method displays a dialog box that prompts the visitor for input.

Once the prompt function obtains input from the user, it returns that input. If the user press the cancel button in the dialog or close box, a value null will be returned.

Syntax: – prompt(text, defaultText)

open ( ) Method

The open( ) method creates a new secondary browser window, similar to choosing New Window from the File menu. It returns a Window object representing the newly-created window. If the window couldn’t be opened, the returned value is instead null.

Syntax: – window.open (URL, name, features, replace)

URL – URL indicates the document to load into the window. If no URL is specified, a new window with about: blank is opened

Name – Specifies the target attribute or the name of the window. The following values are supported:

_blank – URL is loaded into a new window. This is default
_parent – URL is loaded into the parent frame
_self – URL replaces the current page
_top – URL replaces any framesets that may be loaded

open ( ) Method

Syntax: – window.open (URL, name, features, replace)

Features – It is a comma-delimited string that lists the features of the window.

Replace – It indicates whether or not the URL specified should replace the window’s contents. This would apply to a window that was already created. Value can be true/false.

Features

Feature Parameter	Value	Example
alwaysLowered	yes/no	alwaysLowered=yes
alwaysRaised	yes/no	alwaysRaised=no
centerscreen	yes/no	centerscreen=yes
chrome	yes/no	chrome=yes/true
close	yes/no	close=no
dialog	yes/no	dialog=yes
dependent	yes/no	dependent=yes
z-lock	yes/no	z-lock=yes
hotkeys	yes/no	hotkeys=yes

Features

Feature Parameter	Value	Example
location	yes/no	location=no
menubar	yes/no	menubar=no
minimizable	yes/no	minimizable=no
modal	yes/no	modal=yes
personalbar	yes/no	personalbar=yes/true
resizable	yes/no	resizable=no
scrollbars	yes/no	scrollbars=no
status	yes/no	status=no
titlebar	yes/no	titlebar=yes

Features

Feature Parameter	Value	Example
toolbar	yes/no	toolbar=yes
top	pixel value	top=20
height	pixel value	height=200
width	pixel value	width=200
innerHeight	pixel value	innerHeight=200
innerWidth	pixel value	innerWidth=200
outerHeight	pixel value	outerHeight=200
outerWidth	pixel value	outerWidth=200
left	pixel value	left=20

close ( ) Method

Once a window is open, the close ( ) method is used to close it. It closes the current window or the window on which it was called. This method is only allowed to be called for windows that were opened by a script using the window.open() method. It is often used together with open ( ) method.

Syntax: – window.close ( )

Tagged : Javascript / Method / Parameter / properties / window object