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

Availability

JavaScript 1.0; enhanced in JavaScript 1.1

Synopsis

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

Description

The onclick property
of an Input object specifies an event handler function that is
invoked when the user clicks on the input element. It is not invoked
when the click( ) method is called for the
element.

Only form elements that are buttons invoke the
onclick event handler. These are the Button,
Checkbox, Radio, Reset, and Submit elements. Other form elements use
the onchange event handler instead of
onclick.

The initial value of the onclick property is a
function containing the semicolon-separated JavaScript statements
specified by the onclick 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 onclick 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.

Note that the Reset and Submit elements perform a default action when
clicked: they reset and submit, respectively, the form that contains
them. You can use the onclick event handlers of
each of these elements to perform actions in addition to these
default actions. In JavaScript 1.1, you can also prevent these
default actions by returning false. That is, if
the onclick handler of a

Reset button returns false,
the form is not reset, and if the onclick handler
of a

Submit button returns
false, the form is not submitted. Note that you do
similar things with the onsubmit and
onreset event handlers of the Form object itself.

Finally, note that the Link object also defines an
onclick event handler.

See Also

Link.onclick; Chapter 19; EventListener,
EventTarget, and MouseEvent in the DOM reference section