マウスホイールを無効にするスニペット、レガシーブラウザ対応

stopMouseWheel.js

/*global $, Modernizr */
/*
* @require jquery.mousewheel.js
*/
function stopMouseWheel(enabled){
	if(Modernizr.touch){
		return;
	}
	if(enabled) {
		var wheel = function(event) {
			if(event.preventDefault){
				event.preventDefault();
			}
			event.returnValue = false;
		};
		if(window.addEventListener) {
			$(window).on("mousewheel", mousewheelPreventDefaultHandler);
		} else {
			window.onmousewheel = document.onmousewheel = wheel;
		}
	} else {
		if(window.addEventListener) {
			$(window).off("mousewheel", mousewheelPreventDefaultHandler);
		} else {
			window.onmousewheel = document.onmousewheel = null;
		}
	}
};

function mousewheelPreventDefaultHandler(e) {
	if(!window.addEventListener) {
		window.event.returnValue = false;
		return;
	}
	e.preventDefault();
	e.stopPropagation();
	e.returnValue = false;
};