No mousewheel? No problem! This script will scroll the page if you place your mouse near the top or bottom of the window and wiggle it.
Version au
// Marc Belmont presents : Auto Scroll!
// version 1.6
// 2006-10-09
//
// Tweaked by joeytwiddle
//
// ==UserScript==
// @name Auto Scroll Mouse
// @namespace http://www.marcbelmont.com
// @description No mousewheel? No problem! This script will scroll the page if you place your mouse near the top or bottom of the window and wiggle it.
// @version 2.1.5
// @license ISC
// @include http://*/*
// @include https://*/*
// ==/UserScript==
// TODO: Do not scroll after a mousedown (so it won't interfere when dragging/selecting)
//////////////////////
// Constants //
//////////////////////
// Which key should be held to enable scrolling. Possible values are 0 | 1
// Enable more than one to require a combination be held.
var ONLY_WHEN_HOLDING_SHIFT = 0;
var ONLY_WHEN_HOLDING_CTRL = 0;
var ONLY_WHEN_HOLDING_ALT = 0;
var NOSCROLL_PERCENT = 50; // Area in the middle of the page where there won't be scrolling
var SCROLLSTEP = 5; // Scrolling speed
var ONLYLEFTRIGHT = 1; // Scrolling will happen only when you move left or right in the top or bottom areas. Possible values are 0 | 1
var ONLYLEFTRIGHT_MOUSESPEED = 1.5; // Acceleration
var ONLYLEFTRIGHT_DONTSCROLL = 100; // if no event for too long, no scrolling
var DELAY_TIME = 5; // This tries to reduce the number of scroll operations, to reduce load on the browser
//////////////////////
// Some Code //
//////////////////////
var _mX = 0;
var _mXOld = 0;
var _mYOld = 0;
var _mY = 0;
var _go = 0;
var _mNow = new Date();
var _mThen = new Date();
// 2. scroll the window
function ScrollWindow() {
// don't scroll if we're in the middle of the page
var end = ((_mY - window.pageYOffset) - window.innerHeight/2);
if (Math.abs(end) < window.innerHeight*NOSCROLL_PERCENT/200) {
return;
}
/* var down = (_mY - window.pageYOffset) / window.innerHeight;
if (Math.abs(down - 0.5)*2 < NOSCROLL_PERCENT/100) {
return;
} */
// if ONLYLEFTRIGHT is on, scroll only when you move left or right,
if (ONLYLEFTRIGHT && (Math.abs(_mY - _mYOld) > 2)) {
return;
}
// if you want scrolling, mouse have to go start moving slowly
if (Math.abs(_mY - _mYOld) < 7 && Math.abs(_mX - _mXOld) < 7)
_go = 1;
// scroll the page
var way = end > 0 ? 1 : -1;
var val = SCROLLSTEP;
if (ONLYLEFTRIGHT) {
if (_go) {
val = Math.pow(Math.abs(_mX - _mXOld), ONLYLEFTRIGHT_MOUSESPEED);
} else {
val = 0;
}
}
if (val != 0) {
window.scrollTo(window.pageXOffset, window.pageYOffset + val*way);
}
}
function maybe(scrollWindow) {
var timer;
return function(){
if (!timer) {
timer = setTimeout(function(){
timer = null;
scrollWindow();
_mXOld = _mX;
_mYOld = _mY;
_mThen = _mNow;
}, DELAY_TIME);
}
};
}
var maybeScrollWindow = maybe(ScrollWindow);
// 1. Catch mouse movement
document.addEventListener('mousemove', mousemove, true);
function mousemove(e)
{
// get mouse pos and the date
if (!e)
var e = window.event || window.Event;
if('undefined'!=typeof e.pageX) {
_mX = e.pageX;
_mY = e.pageY;
} else {
_mX = e.clientX + document.body.scrollLeft;
_mY = e.clientY + document.body.scrollTop;
}
_mNow = Date.now();
// Hack to avoid unwanted scrolling when the mouse enters a window
// if no event for too long, no scrolling
if (_mNow - _mThen > ONLYLEFTRIGHT_DONTSCROLL)
_go = 0;
if (ONLY_WHEN_HOLDING_SHIFT && !e.shiftKey) return;
if (ONLY_WHEN_HOLDING_CTRL && !e.ctrlKey) return;
if (ONLY_WHEN_HOLDING_ALT && !e.altKey) return;
// Scroll the window
maybeScrollWindow();
}