Oggetto di evento del HTML DOM

<html>
<head>
<script type="text/javascript">
function whichButton(event)
{
alert(event.keyCode)
}

</script>
</head>

<body onkeyup="whichButton(event)">
<p><b>Note:</b> Make sure the right frame has focus when trying this example!</p>
<p>Press a key on your keyboard. An alert box will alert the unicode of the key pressed.</p>
</body>

</html>

Oggetto di evento

L'oggetto di evento rappresenta il dichiarare di un evento, quale l'elemento in cui l'evento si � presentato, il dichiarare delle chiavi di tastiera, la posizione del mouse ed il dichiarare dei tasti di mouse.

L'oggetto di evento � disponibile soltanto durante l'evento che �, voi pu� usarlo soltanto negli alimentatori di evento ma non nell'altro codice.

In VBScript, dovete accedere all'oggetto di evento attraverso l'oggetto della finestra soltanto.

Le collezioni, gli eventi e le propriet� dell'oggetto di evento sono descritti qui sotto:

IE: Internet Explorer, O: Opera, F: Firefox, W3C: Consorzio di World Wide Web (campione del Internet)

Collezioni

Collection	Description	IE	F	O	W3C
bookmarks[]	Returns a collection of bookmarks connected to the rows affected by the events
boundElements[]	Returns a collection of all elements on a page which are bound to a data test

Propriet�

Property	Description	IE	F	O
altKey	Sets or returns a Boolean value that indicates the state of the ALT key	4
altLeft	Returns a Boolean value that indicates the state of the left ALT key	5
button	Sets or returns the mouse button pressed by the user	4	1	9
cancelBubble	Sets or returns a Boolean value that indicates whether or not the current event should bubble up the hierarchy of event handlers	4
clientX	Sets or returns the x-coordinate of the mouse pointer - relative to the screen, excluding decorations and scroll bars	4	1	9
clientY	Sets or returns the y-coordinate of the mouse pointer - relative to the screen, excluding decorations and scroll bars	4	1	9
contentOverflow		5
ctrlKey	Sets or returns a Boolean value that indicates the state of the CTRL key	4
ctrlLeft	Sets or returns a Boolean value that indicates the state of the left CTRL key	5
dataFld	Sets or returns the data column affected by the oncellchange event	5
fromElement	Sets or returns the object from which activation or the mouse pointer is exiting during the event	4
keyCode	Sets or returns the UNICODE of the key pressed	4	1	9
nextPage	Returns the position of the next page within a print template	5
offsetX	Sets or returns the x-coordinate of the mouse pointer relative to the object firing the event	4
offsetY	Sets or returns the y-coordinate of the mouse pointer relative to the object firing the event	4
propertyName	Sets or returns the name of the property that has changed on the object	5
qualifier		5
reason	Sets or returns the result of a data transfer for a data source 0 - Successfully 1 - Aborted 2 - Error	4
recordset	Sets or returns a reference to the default record set in a data source	4
repeat	Returns a Boolean value that indicates whether the ONKEYDOWN event is being repeated	5
returnValue	Sets or returns the return value from an event	4
saveType	Returns the clipboard type when ONCONTENTSAVE fires	5
screenX	Sets or returns the x-coordinate of the mouse pointer - relative to the screen	4	1	9
screenY	Sets or returns the y-coordinate of the mouse pointer - relative to the screen	4	1	9
shiftKey	Returns a Boolean value that indicates the state of the SHIFT key	4	1	9
shiftLeft	Returns a Boolean value that indicates the state of the left SHIFT key	5
srcElement	Sets or returns the object that fired the event	4
srcFilter	Sets or returns the filter object that fired the ONFILTERCHANGE event	4
srcUrn	Sets or returns the Universal Resource Name (URN) of the behavior that fired the event	5
toElement	Sets or returns a reference to the object toward which the user is moving the mouse pointer	4
type	Sets or returns the event name	4	1	9
userName		5
wheelDelta	Returns the distance and the direction the wheel button has rolled	5
x	Sets or returns the x-coordinate (in px) of the mouse pointer - relative to a relatively positioned parent element	4	No	9
y	Sets or returns the y-coordinate (in px) of the mouse pointer - relative to a relatively positioned parent element	4	No	9