HTML and CSS Reference
In-Depth Information
quickly clicks the mouse button for a second time, the
onDblClick
event
gets triggered in the browser as well.
If you need to detect both halves of a mouse click as separate events,
use
onMouseDown
and
onMouseUp
. When the user presses the mouse but-
ton, the
onMouseDown
event occurs. The
onMouseUp
event happens when
the user releases the mouse button.
The
onMouseMove
,
onMouseOut
, and
onMouseOver
events happen when the
user drags the mouse pointer. The
onMouseOver
event occurs when the
mouse first enters the display region occupied by the associated HTML
element. After entry,
onMouseMove
events are generated as the mouse
moves about within the element. Finally, when the mouse exits the ele-
ment,
onMouseOut
occurs.
For some elements, the
onFocus
event corresponds to
onMouseOver
, and
onBlur
corresponds to
onMouseOut
.
12.3.3.3. The keyboard events
The HTML 4 and XHTML standards currently support only three events
relating to user keyboard actions:
onKeyDown
,
onKeyUp
, and
onKeyPress
.
The
onKeyDown
event occurs when the user depresses a key on the key-
board;
onKeyUp
happens when the key is released. The
onKeyPress
event
is triggered when a key is pressed and released. Usually, you'll have
handlers for either the up and down events or the composite key-press
event, but not for both.
12.3.3.4. Document events
Most of the document-related event handlers relate to the actions and
states of form controls. For instance,
onReset
and
onSubmit
happen when
the user activates the respective reset or submit button. Similarly,
onSelect
and
onChange
occur as users interact with certain form ele-
ments. See
Chapter 9
for a detailed discussion of these forms-related
events.
