'use strict'; /// @link https://stackoverflow.com/a/4770179/6003907 // left: 37, up: 38, right: 39, down: 40, // spacebar: 32, pageup: 33, pagedown: 34, end: 35, home: 36 var keys = {37: 1, 38: 1, 39: 1, 40: 1}; function preventDefault(e) { e.preventDefault(); } function preventDefaultForScrollKeys(e) { if (keys[e.keyCode]) { preventDefault(e); return false; } } // modern Chrome requires { passive: false } when adding event var supportsPassive = false; try { window.addEventListener("test", null, Object.defineProperty({}, 'passive', { get: function () { supportsPassive = true; } })); } catch(e) {} var wheelOpt = supportsPassive ? { passive: false } : false; var wheelEvent = 'onwheel' in document.createElement('div') ? 'wheel' : 'mousewheel'; export function disableScroll() { // call this to Disable window.addEventListener('DOMMouseScroll', preventDefault, false); // older FF window.addEventListener(wheelEvent, preventDefault, wheelOpt); // modern desktop window.addEventListener('touchmove', preventDefault, wheelOpt); // mobile window.addEventListener('keydown', preventDefaultForScrollKeys, false); } export function enableScroll() { // call this to Enable window.removeEventListener('DOMMouseScroll', preventDefault, false); window.removeEventListener(wheelEvent, preventDefault, wheelOpt); window.removeEventListener('touchmove', preventDefault, wheelOpt); window.removeEventListener('keydown', preventDefaultForScrollKeys, false); }