Javascript [Electronic resources] : The Definitive Guide (4th Edition) نسخه متنی

Available

JavaScript 1.0

Synopsis

<input type="file" onchange="handler"...>
fileupload.onchange

Description

The onchange property of a FileUpload element
specifies an event handler function that is invoked when the user
changes the value in the input field (either by typing directly or
using the

Browse button) and then
moves input focus elsewhere. This handler is intended to process a
complete change to the input value and therefore is not invoked on a
keystroke-by-keystroke basis.

The initial value of this property is a function that contains the
semicolon-separated JavaScript statements specified by the
onchange 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 onchange
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.

See Also

Input.onchange; Chapter 19; Event, EventListener,
and EventTarget in the DOM reference section