Я использовал этот код раньше для обнаружения событий колесика мыши - возможно, для некоторого использования.Прекрасно работает в IE6 + и FF1.0 + - хотя и не проверялось на самых последних браузерах!
/** This is high-level function.
* It must react to delta being more/less than zero.
*/
function handle(delta) {
if (delta < 0)
…;
else
…;
}
/** Event handler for mouse wheel event.
*/
function wheel(event){
var delta = 0;
if (!event) /* For IE. */
event = window.event;
if (event.wheelDelta) { /* IE/Opera. */
delta = event.wheelDelta/120;
} else if (event.detail) { /** Mozilla case. */
/** In Mozilla, sign of delta is different than in IE.
* Also, delta is multiple of 3.
*/
delta = -event.detail/3;
}
/** If delta is nonzero, handle it.
* Basically, delta is now positive if wheel was scrolled up,
* and negative, if wheel was scrolled down.
*/
if (delta)
handle(delta);
/** Prevent default actions caused by mouse wheel.
* That might be ugly, but we handle scrolls somehow
* anyway, so don't bother here..
*/
if (event.preventDefault)
event.preventDefault();
event.returnValue = false;
}
/** Initialization code.
* If you use your own event management code, change it as required.
*/
if (window.addEventListener)
/** DOMMouseScroll is for mozilla. */
window.addEventListener('DOMMouseScroll', wheel, false);
/** IE/Opera. */
window.onmousewheel = document.onmousewheel = wheel;