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JavaScript: The Definitive Guide, 4th Edition
By
David Flanagan
Publisher
: O'Reilly
Pub Date
: November 2001
ISBN
: 0-596-00048-0
Pages
: 936
Slots
: 1
This fourth edition of the definitive reference to
JavaScript, a scripting language that can be embedded
directly in web pages, covers the latest version of the
language, JavaScript 1.5, as supported by Netscape 6 and
Internet Explorer 6. The book also provides complete
coverage of the W3C DOM standard (Level 1 and Level 2),
while retaining material on the legacy Level 0 DOM for
backward compatibility.
Availability
JavaScript 1.1
Synopsis
<body onfocus="handler" ... ><frameset onfocus="handler" ... >
window.onfocus
Description
The onfocus property of a Window specifies an
event handler function that is invoked when the window is given
keyboard focus.
The initial value of this property is a function that contains the
semicolon-separated JavaScript statements specified by the
onfocus attribute of
the <body> or
<frameset> tags.
In the Netscape 4 event model, the onfocus handler
function is passed an Event object as an argument. In the IE event
model, no argument is passed, but the applicable Event object is
available as the event property of the Window
object that contains the element.
Usage
If your web page has animation, you can use the
onfocus event handler to start the animation and
the onblur handler to stop it, so it runs only
when the user is paying attention to the window.
See Also
Window.blur( ), Window.focus( ), Window.onblur; Chapter 19; Event, EventListener, and EventTarget in the
DOM reference section
