my current issue: smooth scrolling overshooting row want land on. it's set using default visual composer. attached smooth scrolling js file. guidance great
ref url: wmgdev006.com
// smoothscroll websites v1.2.1 // licensed under terms of mit license. // people involved // - balazs galambosi (maintainer) // - michael herf (pulse algorithm) (function(){ // scroll variables (tweakable) var defaultoptions = { // scrolling core framerate : 150, // [hz] animationtime : 500, // [px] stepsize : 150, // [px] // pulse (less tweakable) // ratio of "tail" "acceleration" pulsealgorithm : true, pulsescale : 6, pulsenormalize : 1, // acceleration accelerationdelta : 20, // 20 accelerationmax : 1, // 1 // keyboard settings keyboardsupport : true, // option arrowscroll : 50, // [px] // other touchpadsupport : true, fixedbackground : true, excluded : "" }; var options = defaultoptions; // other variables var isexcluded = false; var isframe = false; var direction = { x: 0, y: 0 }; var initdone = false; var root = document.documentelement; var activeelement; var observer; var deltabuffer = [ 120, 120, 120 ]; var key = { left: 37, up: 38, right: 39, down: 40, spacebar: 32, pageup: 33, pagedown: 34, end: 35, home: 36 }; /*********************************************** * settings ***********************************************/ var options = defaultoptions; /*********************************************** * initialize ***********************************************/ /** * tests if smooth scrolling allowed. shuts down if not. */ function inittest() { var disablekeyboard = false; // disable keyboard support if above requested if (disablekeyboard) { removeevent("keydown", keydown); } if (options.keyboardsupport && !disablekeyboard) { addevent("keydown", keydown); } } /** * sets scrolls array, determines if frames involved. */ function init() { if (!document.body) return; var body = document.body; var html = document.documentelement; var windowheight = window.innerheight; var scrollheight = body.scrollheight; // check compat mode root element root = (document.compatmode.indexof('css') >= 0) ? html : body; activeelement = body; inittest(); initdone = true; // checks if script running in frame if (top != self) { isframe = true; } /** * fixes bug areas left , right * content not trigger onmousewheel event * on pages. e.g.: html, body { height: 100% } */ else if (scrollheight > windowheight && (body.offsetheight <= windowheight || html.offsetheight <= windowheight)) { html.style.height = 'auto'; //settimeout(refresh, 10); // clearfix if (root.offsetheight <= windowheight) { var underlay = document.createelement("div"); underlay.style.clear = "both"; body.appendchild(underlay); } } // disable fixed background if (!options.fixedbackground && !isexcluded) { body.style.backgroundattachment = "scroll"; html.style.backgroundattachment = "scroll"; } } /************************************************ * scrolling ************************************************/ var que = []; var pending = false; var lastscroll = +new date; /** * pushes scroll actions scrolling queue. */ function scrollarray(elem, left, top, delay) { delay || (delay = 1000); directioncheck(left, top); if (options.accelerationmax != 1) { var = +new date; var elapsed = - lastscroll; if (elapsed < options.accelerationdelta) { var factor = (1 + (30 / elapsed)) / 2; if (factor > 1) { factor = math.min(factor, options.accelerationmax); left *= factor; top *= factor; } } lastscroll = +new date; } // push scroll command que.push({ x: left, y: top, lastx: (left < 0) ? 0.99 : -0.99, lasty: (top < 0) ? 0.99 : -0.99, start: +new date }); // don't act if there's pending queue if (pending) { return; } var scrollwindow = (elem === document.body); var step = function (time) { var = +new date; var scrollx = 0; var scrolly = 0; (var = 0; < que.length; i++) { var item = que[i]; var elapsed = - item.start; var finished = (elapsed >= options.animationtime); // scroll position: [0, 1] var position = (finished) ? 1 : elapsed / options.animationtime; // easing [optional] if (options.pulsealgorithm) { position = pulse(position); } // need difference var x = (item.x * position - item.lastx) >> 0; var y = (item.y * position - item.lasty) >> 0; // add total scrolling scrollx += x; scrolly += y; // update last values item.lastx += x; item.lasty += y; // delete , step if it's on if (finished) { que.splice(i, 1); i--; } } // scroll left , top if (scrollwindow) { window.scrollby(scrollx, scrolly); } else { if (scrollx) elem.scrollleft += scrollx; if (scrolly) elem.scrolltop += scrolly; } // clean if there's nothing left if (!left && !top) { que = []; } if (que.length) { requestframe(step, elem, (delay / options.framerate + 1)); } else { pending = false; } }; // start new queue of actions requestframe(step, elem, 0); pending = true; } /*********************************************** * events ***********************************************/ /** * mouse wheel handler. * @param {object} event */ function wheel(event) { if (!initdone) { init(); } var target = event.target; var overflowing = overflowingancestor(target); // use default if there's no overflowing // element or default action prevented if (!overflowing || event.defaultprevented || isnodename(activeelement, "embed") || (isnodename(target, "embed") && /\.pdf/i.test(target.src))) { return true; } var deltax = event.wheeldeltax || 0; var deltay = event.wheeldeltay || 0; // use wheeldelta if deltax/y not available if (!deltax && !deltay) { deltay = event.wheeldelta || 0; } // check if it's touchpad scroll should ignored if (!options.touchpadsupport && istouchpad(deltay)) { return true; } // scale step size // delta 120 of time // synaptics seems send 1 if (math.abs(deltax) > 1.2) { deltax *= options.stepsize / 120; } if (math.abs(deltay) > 1.2) { deltay *= options.stepsize / 120; } scrollarray(overflowing, -deltax, -deltay); event.preventdefault(); } /** * keydown event handler. * @param {object} event */ function keydown(event) { var target = event.target; var modifier = event.ctrlkey || event.altkey || event.metakey || (event.shiftkey && event.keycode !== key.spacebar); // nothing if user editing text // or using modifier key (except shift) // or in dropdown if ( /input|textarea|select|embed/i.test(target.nodename) || target.iscontenteditable || event.defaultprevented || modifier ) { return true; } // spacebar should trigger button press if (isnodename(target, "button") && event.keycode === key.spacebar) { return true; } var shift, x = 0, y = 0; var elem = overflowingancestor(activeelement); var clientheight = elem.clientheight; if (elem == document.body) { clientheight = window.innerheight; } switch (event.keycode) { case key.up: y = -options.arrowscroll; break; case key.down: y = options.arrowscroll; break; case key.spacebar: // (+ shift) shift = event.shiftkey ? 1 : -1; y = -shift * clientheight * 0.9; break; case key.pageup: y = -clientheight * 0.9; break; case key.pagedown: y = clientheight * 0.9; break; case key.home: y = -elem.scrolltop; break; case key.end: var damt = elem.scrollheight - elem.scrolltop - clientheight; y = (damt > 0) ? damt+10 : 0; break; case key.left: x = -options.arrowscroll; break; case key.right: x = options.arrowscroll; break; default: return true; // key don't care } scrollarray(elem, x, y); event.preventdefault(); } /** * mousedown event updating activeelement */ function mousedown(event) { activeelement = event.target; } /*********************************************** * overflow ***********************************************/ var cache = {}; // cleared out every once in while setinterval(function () { cache = {}; }, 10 * 1000); var uniqueid = (function () { var = 0; return function (el) { return el.uniqueid || (el.uniqueid = i++); }; })(); function setcache(elems, overflowing) { (var = elems.length; i--;) cache[uniqueid(elems[i])] = overflowing; return overflowing; } function overflowingancestor(el) { var elems = []; var rootscrollheight = root.scrollheight; { var cached = cache[uniqueid(el)]; if (cached) { return setcache(elems, cached); } elems.push(el); if (rootscrollheight === el.scrollheight) { if (!isframe || root.clientheight + 10 < rootscrollheight) { return setcache(elems, document.body); // scrolling root in webkit } } else if (el.clientheight + 10 < el.scrollheight) { overflow = getcomputedstyle(el, "").getpropertyvalue("overflow-y"); if (overflow === "scroll" || overflow === "auto") { return setcache(elems, el); } } } while (el = el.parentnode); } /*********************************************** * helpers ***********************************************/ function addevent(type, fn, bubble) { window.addeventlistener(type, fn, (bubble||false)); } function removeevent(type, fn, bubble) { window.removeeventlistener(type, fn, (bubble||false)); } function isnodename(el, tag) { return (el.nodename||"").tolowercase() === tag.tolowercase(); } function directioncheck(x, y) { x = (x > 0) ? 1 : -1; y = (y > 0) ? 1 : -1; if (direction.x !== x || direction.y !== y) { direction.x = x; direction.y = y; que = []; lastscroll = 0; } } var deltabuffertimer; function istouchpad(deltay) { if (!deltay) return; deltay = math.abs(deltay) deltabuffer.push(deltay); deltabuffer.shift(); cleartimeout(deltabuffertimer); var allequals = (deltabuffer[0] == deltabuffer[1] && deltabuffer[1] == deltabuffer[2]); var alldivisable = (isdivisible(deltabuffer[0], 120) && isdivisible(deltabuffer[1], 120) && isdivisible(deltabuffer[2], 120)); return !(allequals || alldivisable); } function isdivisible(n, divisor) { return (math.floor(n / divisor) == n / divisor); } var requestframe = (function () { return window.requestanimationframe || window.webkitrequestanimationframe || function (callback, element, delay) { window.settimeout(callback, delay || (1000/60)); }; })(); /*********************************************** * pulse ***********************************************/ /** * viscous fluid pulse part , decay rest. * - applies fixed force on interval (a damped acceleration), , * - lets exponential bleed away velocity on longer interval * - michael herf, http://stereopsis.com/stopping/ */ function pulse_(x) { var val, start, expx; // test x = x * options.pulsescale; if (x < 1) { // acceleartion val = x - (1 - math.exp(-x)); } else { // tail // previous animation ended here: start = math.exp(-1); // simple viscous drag x -= 1; expx = 1 - math.exp(-x); val = start + (expx * (1 - start)); } return val * options.pulsenormalize; } function pulse(x) { if (x >= 1) return 1; if (x <= 0) return 0; if (options.pulsenormalize == 1) { options.pulsenormalize /= pulse_(1); } return pulse_(x); } var ischrome = /chrome/i.test(window.navigator.useragent); var ismousewheelsupported = 'onmousewheel' in document; if (ismousewheelsupported && ischrome) { addevent("mousedown", mousedown); addevent("mousewheel", wheel); addevent("load", init); }; })();
i'm pretty sure can edit in primary scripts folder. had similar issue , solved checking scripts
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