November 2001
Intermediate to advanced
936 pages
68h 43m
English
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Name
Window.onblur — the handler invoked when the window loses keyboard focus
Availability
JavaScript 1.1
Synopsis
<body onblur="handler" ... > <frameset onblur="handler" ... >window.onblur
Description
The onblur property
of a Window specifies an event handler
function that is invoked when the window loses keyboard focus.
The initial value of
this property is a function that contains the semicolon-separated
JavaScript statements specified by the onblur
attribute of the <body> or
<frameset> tags.
In the Netscape 4 event model, the onblur 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 onblur( ) event handler to stop the animation when the window
doesn’t have the input focus. In theory, if the window
doesn’t have the focus, the user probably can’t see it or
isn’t paying attention to it.
See Also
Window.blur( ), Window.focus( ), Window.onfocus; Chapter 19; Event, EventListener, and EventTarget in the DOM reference section