JavaScript: The Definitive Guide, Fourth Edition

Name

Input.onblur — the handler invoked when a form element loses focus

Availability

JavaScript 1.0

Synopsis

<input type="type"onblur="handler"> input.onblur

Description

The onblur property of an Input object specifies an event handler function that is invoked when the user transfers keyboard focus away from that input element. Calling blur( ) to remove focus from an element does not invoke onblur for that object. Note, however, that calling focus( ) to transfer focus to some other element causes the onblur event handler to be invoked for whichever element currently has the focus.

The initial value of this property is a function that contains the semicolon-separated JavaScript statements specified by the onblur attribute of the HTML tag that defined the object. When an event handler function is defined by an HTML attribute, it is executed in the scope of element rather than in the scope of the containing window.

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.

The onblur event handler is available for all form elements except the Hidden element. In Netscape on Unix platforms, however, it is invoked only for the text-entry elements: Text, Textarea, Password, and FileUpload. Note that in JavaScript 1.1, the Window object also defines an onblur event handler.

See Also

Window.onblur ...