|
<HTML>
<HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!--
/** This is high-level function.
* It must react to delta being more/less than zero.
*/
function handle(delta) {
var mw = document.getElementById('mousewheel');
if (delta < 0){
mw.innerHTML = delta + ' Down';
} else {
mw.innerHTML = delta + ' Up';
}
}
/** 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;
/** In Opera 9, delta differs in sign as compared to IE.
*/
if (window.opera)
delta = -delta;
} 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);
}
/** 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;
//-->
</SCRIPT>
</HEAD>
<BODY>
Mouse Wheel : <div id="mousewheel"></div>
</BODY>
</HTML>
|