wheelDelta Property

Retrieves the distance and direction the wheel button has rolled.

Syntax

[ p = ] event.wheelDelta

Possible Values

p Integer that receives the distance and direction that the wheel button has rolled.
The property is read-only. The property has no default value.
Expressions can be used in place of the preceding value(s), as of Microsoft® Internet Explorer 5. For more information, see About Dynamic Properties.

Remarks

This property indicates the distance that the wheel has rotated, expressed in multiples of 120. A positive value indicates that the wheel has rotated away from the user. A negative value indicates that the wheel has rotated toward the user.
This property is used with the onmousewheel event.

Example

The following example shows how to use the wheelDelta with the onmousewheel event to measure the distance the wheel button has rotated. Measurement values of wheelDelta are in multiples of 120.
<HTML>
<HEAD>
<SCRIPT>
function updateDelta(){
oNotice.innerText=event.wheelDelta;
}
</SCRIPT>
</HEAD>
<BODY>
<DIV onmousewheel="updateDelta()">Place cursor over this sentence and roll! wheelDelta:
(<SPAN ID="oNotice"></SPAN>)
</DIV>
</BODY>
</HTML>
This feature requires Microsoft® Internet Explorer 6 or later. Click the following icon to install the latest version. Then reload this page to view the sample.

Applies To

event

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wheelDelta Property