requirebin sketch

index.js

const zenscroll = require('zenscroll');

const top = document.getElementsByClassName('top')[0];
const scroller = zenscroll.createScroller(top, 200);

window.jumpToA = () => {
  const divA = document.getElementsByClassName('a')[0];
  scroller.center(divA);
};

window.jumpToB = () => {
  const divB = document.getElementsByClassName('b')[0];
  scroller.center(divB);
};

window.jumpToC = () => {
  const divC = document.getElementsByClassName('c')[0];
  scroller.center(divC);
};

minified.js

setTimeout(function(){
;require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({"zenscroll":[function(require,module,exports){
/**
 * Zenscroll 4.0.0
 * https://github.com/zengabor/zenscroll/
 *
 * Copyright 2015–2017 Gabor Lenard
 *
 * This is free and unencumbered software released into the public domain.
 * 
 * Anyone is free to copy, modify, publish, use, compile, sell, or
 * distribute this software, either in source code form or as a compiled
 * binary, for any purpose, commercial or non-commercial, and by any
 * means.
 * 
 * In jurisdictions that recognize copyright laws, the author or authors
 * of this software dedicate any and all copyright interest in the
 * software to the public domain. We make this dedication for the benefit
 * of the public at large and to the detriment of our heirs and
 * successors. We intend this dedication to be an overt act of
 * relinquishment in perpetuity of all present and future rights to this
 * software under copyright law.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 * 
 * For more information, please refer to <http://unlicense.org>
 * 
 */

/*jshint devel:true, asi:true */

/*global define, module */


(function (root, factory) {
	if (typeof define === "function" && define.amd) {
		define([], factory())
	} else if (typeof module === "object" && module.exports) {
		module.exports = factory()
	} else {
		(function install() {
			// To make sure Zenscroll can be referenced from the header, before `body` is available
			if (document && document.body) {
				root.zenscroll = factory()
			} else {
				// retry 9ms later
				setTimeout(install, 9)
			}
		})()
	}
}(this, function () {
	"use strict"


	// Detect if the browser already supports native smooth scrolling (e.g., Firefox 36+ and Chrome 49+) and it is enabled:
	var isNativeSmoothScrollEnabledOn = function (elem) {
		return ("getComputedStyle" in window) &&
			window.getComputedStyle(elem)["scroll-behavior"] === "smooth"
	}


	// Exit if it’s not a browser environment:
	if (typeof window === "undefined" || !("document" in window)) {
		return {}
	}


	var makeScroller = function (container, defaultDuration, edgeOffset) {

		// Use defaults if not provided
		defaultDuration = defaultDuration || 999 //ms
		if (!edgeOffset && edgeOffset !== 0) {
			// When scrolling, this amount of distance is kept from the edges of the container:
			edgeOffset = 9 //px
		}

		// Handling the life-cycle of the scroller
		var scrollTimeoutId
		var setScrollTimeoutId = function (newValue) {
			scrollTimeoutId = newValue
		}

		/**
		 * Stop the current smooth scroll operation immediately
		 */
		var stopScroll = function () {
			clearTimeout(scrollTimeoutId)
			setScrollTimeoutId(0)
		}

		var getTopWithEdgeOffset = function (elem) {
			return Math.max(0, container.getTopOf(elem) - edgeOffset)
		}

		/**
		 * Scrolls to a specific vertical position in the document.
		 *
		 * @param {targetY} The vertical position within the document.
		 * @param {duration} Optionally the duration of the scroll operation.
		 *        If not provided the default duration is used.
		 * @param {onDone} An optional callback function to be invoked once the scroll finished.
		 */
		var scrollToY = function (targetY, duration, onDone) {
			stopScroll()
			if (duration === 0 || (duration && duration < 0) || isNativeSmoothScrollEnabledOn(container.body)) {
				container.toY(targetY)
				if (onDone) {
					onDone()
				}
			} else {
				var startY = container.getY()
				var distance = Math.max(0, targetY) - startY
				var startTime = new Date().getTime()
				duration = duration || Math.min(Math.abs(distance), defaultDuration);
				(function loopScroll() {
					setScrollTimeoutId(setTimeout(function () {
						// Calculate percentage:
						var p = Math.min(1, (new Date().getTime() - startTime) / duration)
						// Calculate the absolute vertical position:
						var y = Math.max(0, Math.floor(startY + distance*(p < 0.5 ? 2*p*p : p*(4 - p*2)-1)))
						container.toY(y)
						if (p < 1 && (container.getHeight() + y) < container.body.scrollHeight) {
							loopScroll()
						} else {
							setTimeout(stopScroll, 99) // with cooldown time
							if (onDone) {
								onDone()
							}
						}
					}, 9))
				})()
			}
		}

		/**
		 * Scrolls to the top of a specific element.
		 *
		 * @param {elem} The element to scroll to.
		 * @param {duration} Optionally the duration of the scroll operation.
		 * @param {onDone} An optional callback function to be invoked once the scroll finished.
		 */
		var scrollToElem = function (elem, duration, onDone) {
			scrollToY(getTopWithEdgeOffset(elem), duration, onDone)
		}

		/**
		 * Scrolls an element into view if necessary.
		 *
		 * @param {elem} The element.
		 * @param {duration} Optionally the duration of the scroll operation.
		 * @param {onDone} An optional callback function to be invoked once the scroll finished.
		 */
		var scrollIntoView = function (elem, duration, onDone) {
			var elemHeight = elem.getBoundingClientRect().height
			var elemBottom = container.getTopOf(elem) + elemHeight
			var containerHeight = container.getHeight()
			var y = container.getY()
			var containerBottom = y + containerHeight
			if (getTopWithEdgeOffset(elem) < y || (elemHeight + edgeOffset) > containerHeight) {
				// Element is clipped at top or is higher than screen.
				scrollToElem(elem, duration, onDone)
			} else if ((elemBottom + edgeOffset) > containerBottom) {
				// Element is clipped at the bottom.
				scrollToY(elemBottom - containerHeight + edgeOffset, duration, onDone)
			} else if (onDone) {
				onDone()
			}
		}

		/**
		 * Scrolls to the center of an element.
		 *
		 * @param {elem} The element.
		 * @param {duration} Optionally the duration of the scroll operation.
		 * @param {offset} Optionally the offset of the top of the element from the center of the screen.
		 * @param {onDone} An optional callback function to be invoked once the scroll finished.
		 */
		var scrollToCenterOf = function (elem, duration, offset, onDone) {
			scrollToY(Math.max(0, container.getTopOf(elem) - container.getHeight()/2 + (offset || elem.getBoundingClientRect().height/2)), duration, onDone)
		}

		/**
		 * Changes default settings for this scroller.
		 *
		 * @param {newDefaultDuration} Optionally a new value for default duration, used for each scroll method by default.
		 *        Ignored if null or undefined.
		 * @param {newEdgeOffset} Optionally a new value for the edge offset, used by each scroll method by default. Ignored if null or undefined.
		 * @returns An object with the current values.
		 */
		var setup = function (newDefaultDuration, newEdgeOffset) {
			if (newDefaultDuration === 0 || newDefaultDuration) {
				defaultDuration = newDefaultDuration
			}
			if (newEdgeOffset === 0 || newEdgeOffset) {
				edgeOffset = newEdgeOffset
			}
			return {
				defaultDuration: defaultDuration,
				edgeOffset: edgeOffset
			}
		}

		return {
			setup: setup,
			to: scrollToElem,
			toY: scrollToY,
			intoView: scrollIntoView,
			center: scrollToCenterOf,
			stop: stopScroll,
			moving: function () { return !!scrollTimeoutId },
			getY: container.getY,
			getTopOf: container.getTopOf
		}

	}


	var docElem = document.documentElement
	var getDocY = function () { return window.scrollY || docElem.scrollTop }

	// Create a scroller for the document:
	var zenscroll = makeScroller({
		body: document.scrollingElement || document.body,
		toY: function (y) { window.scrollTo(0, y) },
		getY: getDocY,
		getHeight: function () { return window.innerHeight || docElem.clientHeight },
		getTopOf: function (elem) { return elem.getBoundingClientRect().top + getDocY() - docElem.offsetTop }
	})


	/**
	 * Creates a scroller from the provided container element (e.g., a DIV)
	 *
	 * @param {scrollContainer} The vertical position within the document.
	 * @param {defaultDuration} Optionally a value for default duration, used for each scroll method by default.
	 *        Ignored if 0 or null or undefined.
	 * @param {edgeOffset} Optionally a value for the edge offset, used by each scroll method by default. 
	 *        Ignored if null or undefined.
	 * @returns A scroller object, similar to `zenscroll` but controlling the provided element.
	 */
	zenscroll.createScroller = function (scrollContainer, defaultDuration, edgeOffset) {
		return makeScroller({
			body: scrollContainer,
			toY: function (y) { scrollContainer.scrollTop = y },
			getY: function () { return scrollContainer.scrollTop },
			getHeight: function () { return Math.min(scrollContainer.clientHeight, window.innerHeight || docElem.clientHeight) },
			getTopOf: function (elem) { return elem.offsetTop }
		}, defaultDuration, edgeOffset)
	}


	// Automatic link-smoothing on achors
	// Exclude IE8- or when native is enabled or Zenscroll auto- is disabled
	if ("addEventListener" in window && !window.noZensmooth && !isNativeSmoothScrollEnabledOn(document.body)) {


		var isScrollRestorationSupported = "scrollRestoration" in history

		// On first load & refresh make sure the browser restores the position first
		if (isScrollRestorationSupported) {
			history.scrollRestoration = "auto"
		}

		window.addEventListener("load", function () {

			if (isScrollRestorationSupported) {
				// Set it to manual
				setTimeout(function () { history.scrollRestoration = "manual" }, 9)
				window.addEventListener("popstate", function (event) {
					if (event.state && "zenscrollY" in event.state) {
						zenscroll.toY(event.state.zenscrollY)
					}
				}, false)
			}

			// Add edge offset on first load if necessary
			// This may not work on IE (or older computer?) as it requires more timeout, around 100 ms
			if (window.location.hash) {
				setTimeout(function () {
					// Adjustment is only needed if there is an edge offset:
					var edgeOffset = zenscroll.setup().edgeOffset
					if (edgeOffset) {
						var targetElem = document.getElementById(window.location.href.split("#")[1])
						if (targetElem) {
							var targetY = Math.max(0, zenscroll.getTopOf(targetElem) - edgeOffset)
							var diff = zenscroll.getY() - targetY
							// Only do the adjustment if the browser is very close to the element:
							if (0 <= diff && diff < 9 ) {
								window.scrollTo(0, targetY)
							}
						}
					}
				}, 9)
			}

		}, false)

		// Handling clicks on anchors
		var RE_noZensmooth = new RegExp("(^|\\s)noZensmooth(\\s|$)")
		window.addEventListener("click", function (event) {
			var anchor = event.target
			while (anchor && anchor.tagName !== "A") {
				anchor = anchor.parentNode
			}
			// Let the browser handle the click if it wasn't with the primary button, or with some modifier keys:
			if (!anchor || event.which !== 1 || event.shiftKey || event.metaKey || event.ctrlKey || event.altKey) {
				return
			}
			// Save the current scrolling position so it can be used for scroll restoration:
			if (isScrollRestorationSupported) {
				try {
					history.replaceState({ zenscrollY: zenscroll.getY() }, "")
				} catch (e) {
					// Avoid the Chrome Security exception on file protocol, e.g., file://index.html
				}
			}
			// Find the referenced ID:
			var href = anchor.getAttribute("href") || ""
			if (href.indexOf("#") === 0 && !RE_noZensmooth.test(anchor.className)) {
				var targetY = 0
				var targetElem = document.getElementById(href.substring(1))
				if (href !== "#") {
					if (!targetElem) {
						// Let the browser handle the click if the target ID is not found.
						return
					}
					targetY = zenscroll.getTopOf(targetElem)
				}
				event.preventDefault()
				// By default trigger the browser's `hashchange` event...
				var onDone = function () { window.location = href }
				// ...unless there is an edge offset specified
				var edgeOffset = zenscroll.setup().edgeOffset
				if (edgeOffset) {
					targetY = Math.max(0, targetY - edgeOffset)
					onDone = function () { history.pushState(null, "", href) }
				}
				zenscroll.toY(targetY, null, onDone)
			}
		}, false)

	}


	return zenscroll


}));

},{}]},{},[])
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"sources":["../../../../home/admin/browserify-cdn/node_modules/browserify/node_modules/browser-pack/_prelude.js","zenscroll"],"names":[],"mappings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file":"generated.js","sourceRoot":"","sourcesContent":["(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})","/**\n * Zenscroll 4.0.0\n * https://github.com/zengabor/zenscroll/\n *\n * Copyright 2015–2017 Gabor Lenard\n *\n * This is free and unencumbered software released into the public domain.\n * \n * Anyone is free to copy, modify, publish, use, compile, sell, or\n * distribute this software, either in source code form or as a compiled\n * binary, for any purpose, commercial or non-commercial, and by any\n * means.\n * \n * In jurisdictions that recognize copyright laws, the author or authors\n * of this software dedicate any and all copyright interest in the\n * software to the public domain. We make this dedication for the benefit\n * of the public at large and to the detriment of our heirs and\n * successors. We intend this dedication to be an overt act of\n * relinquishment in perpetuity of all present and future rights to this\n * software under copyright law.\n * \n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND,\n * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.\n * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR\n * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,\n * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR\n * OTHER DEALINGS IN THE SOFTWARE.\n * \n * For more information, please refer to <http://unlicense.org>\n * \n */\n\n/*jshint devel:true, asi:true */\n\n/*global define, module */\n\n\n(function (root, factory) {\n\tif (typeof define === \"function\" && define.amd) {\n\t\tdefine([], factory())\n\t} else if (typeof module === \"object\" && module.exports) {\n\t\tmodule.exports = factory()\n\t} else {\n\t\t(function install() {\n\t\t\t// To make sure Zenscroll can be referenced from the header, before `body` is available\n\t\t\tif (document && document.body) {\n\t\t\t\troot.zenscroll = factory()\n\t\t\t} else {\n\t\t\t\t// retry 9ms later\n\t\t\t\tsetTimeout(install, 9)\n\t\t\t}\n\t\t})()\n\t}\n}(this, function () {\n\t\"use strict\"\n\n\n\t// Detect if the browser already supports native smooth scrolling (e.g., Firefox 36+ and Chrome 49+) and it is enabled:\n\tvar isNativeSmoothScrollEnabledOn = function (elem) {\n\t\treturn (\"getComputedStyle\" in window) &&\n\t\t\twindow.getComputedStyle(elem)[\"scroll-behavior\"] === \"smooth\"\n\t}\n\n\n\t// Exit if it’s not a browser environment:\n\tif (typeof window === \"undefined\" || !(\"document\" in window)) {\n\t\treturn {}\n\t}\n\n\n\tvar makeScroller = function (container, defaultDuration, edgeOffset) {\n\n\t\t// Use defaults if not provided\n\t\tdefaultDuration = defaultDuration || 999 //ms\n\t\tif (!edgeOffset && edgeOffset !== 0) {\n\t\t\t// When scrolling, this amount of distance is kept from the edges of the container:\n\t\t\tedgeOffset = 9 //px\n\t\t}\n\n\t\t// Handling the life-cycle of the scroller\n\t\tvar scrollTimeoutId\n\t\tvar setScrollTimeoutId = function (newValue) {\n\t\t\tscrollTimeoutId = newValue\n\t\t}\n\n\t\t/**\n\t\t * Stop the current smooth scroll operation immediately\n\t\t */\n\t\tvar stopScroll = function () {\n\t\t\tclearTimeout(scrollTimeoutId)\n\t\t\tsetScrollTimeoutId(0)\n\t\t}\n\n\t\tvar getTopWithEdgeOffset = function (elem) {\n\t\t\treturn Math.max(0, container.getTopOf(elem) - edgeOffset)\n\t\t}\n\n\t\t/**\n\t\t * Scrolls to a specific vertical position in the document.\n\t\t *\n\t\t * @param {targetY} The vertical position within the document.\n\t\t * @param {duration} Optionally the duration of the scroll operation.\n\t\t *        If not provided the default duration is used.\n\t\t * @param {onDone} An optional callback function to be invoked once the scroll finished.\n\t\t */\n\t\tvar scrollToY = function (targetY, duration, onDone) {\n\t\t\tstopScroll()\n\t\t\tif (duration === 0 || (duration && duration < 0) || isNativeSmoothScrollEnabledOn(container.body)) {\n\t\t\t\tcontainer.toY(targetY)\n\t\t\t\tif (onDone) {\n\t\t\t\t\tonDone()\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tvar startY = container.getY()\n\t\t\t\tvar distance = Math.max(0, targetY) - startY\n\t\t\t\tvar startTime = new Date().getTime()\n\t\t\t\tduration = duration || Math.min(Math.abs(distance), defaultDuration);\n\t\t\t\t(function loopScroll() {\n\t\t\t\t\tsetScrollTimeoutId(setTimeout(function () {\n\t\t\t\t\t\t// Calculate percentage:\n\t\t\t\t\t\tvar p = Math.min(1, (new Date().getTime() - startTime) / duration)\n\t\t\t\t\t\t// Calculate the absolute vertical position:\n\t\t\t\t\t\tvar y = Math.max(0, Math.floor(startY + distance*(p < 0.5 ? 2*p*p : p*(4 - p*2)-1)))\n\t\t\t\t\t\tcontainer.toY(y)\n\t\t\t\t\t\tif (p < 1 && (container.getHeight() + y) < container.body.scrollHeight) {\n\t\t\t\t\t\t\tloopScroll()\n\t\t\t\t\t\t} else {\n\t\t\t\t\t\t\tsetTimeout(stopScroll, 99) // with cooldown time\n\t\t\t\t\t\t\tif (onDone) {\n\t\t\t\t\t\t\t\tonDone()\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}, 9))\n\t\t\t\t})()\n\t\t\t}\n\t\t}\n\n\t\t/**\n\t\t * Scrolls to the top of a specific element.\n\t\t *\n\t\t * @param {elem} The element to scroll to.\n\t\t * @param {duration} Optionally the duration of the scroll operation.\n\t\t * @param {onDone} An optional callback function to be invoked once the scroll finished.\n\t\t */\n\t\tvar scrollToElem = function (elem, duration, onDone) {\n\t\t\tscrollToY(getTopWithEdgeOffset(elem), duration, onDone)\n\t\t}\n\n\t\t/**\n\t\t * Scrolls an element into view if necessary.\n\t\t *\n\t\t * @param {elem} The element.\n\t\t * @param {duration} Optionally the duration of the scroll operation.\n\t\t * @param {onDone} An optional callback function to be invoked once the scroll finished.\n\t\t */\n\t\tvar scrollIntoView = function (elem, duration, onDone) {\n\t\t\tvar elemHeight = elem.getBoundingClientRect().height\n\t\t\tvar elemBottom = container.getTopOf(elem) + elemHeight\n\t\t\tvar containerHeight = container.getHeight()\n\t\t\tvar y = container.getY()\n\t\t\tvar containerBottom = y + containerHeight\n\t\t\tif (getTopWithEdgeOffset(elem) < y || (elemHeight + edgeOffset) > containerHeight) {\n\t\t\t\t// Element is clipped at top or is higher than screen.\n\t\t\t\tscrollToElem(elem, duration, onDone)\n\t\t\t} else if ((elemBottom + edgeOffset) > containerBottom) {\n\t\t\t\t// Element is clipped at the bottom.\n\t\t\t\tscrollToY(elemBottom - containerHeight + edgeOffset, duration, onDone)\n\t\t\t} else if (onDone) {\n\t\t\t\tonDone()\n\t\t\t}\n\t\t}\n\n\t\t/**\n\t\t * Scrolls to the center of an element.\n\t\t *\n\t\t * @param {elem} The element.\n\t\t * @param {duration} Optionally the duration of the scroll operation.\n\t\t * @param {offset} Optionally the offset of the top of the element from the center of the screen.\n\t\t * @param {onDone} An optional callback function to be invoked once the scroll finished.\n\t\t */\n\t\tvar scrollToCenterOf = function (elem, duration, offset, onDone) {\n\t\t\tscrollToY(Math.max(0, container.getTopOf(elem) - container.getHeight()/2 + (offset || elem.getBoundingClientRect().height/2)), duration, onDone)\n\t\t}\n\n\t\t/**\n\t\t * Changes default settings for this scroller.\n\t\t *\n\t\t * @param {newDefaultDuration} Optionally a new value for default duration, used for each scroll method by default.\n\t\t *        Ignored if null or undefined.\n\t\t * @param {newEdgeOffset} Optionally a new value for the edge offset, used by each scroll method by default. Ignored if null or undefined.\n\t\t * @returns An object with the current values.\n\t\t */\n\t\tvar setup = function (newDefaultDuration, newEdgeOffset) {\n\t\t\tif (newDefaultDuration === 0 || newDefaultDuration) {\n\t\t\t\tdefaultDuration = newDefaultDuration\n\t\t\t}\n\t\t\tif (newEdgeOffset === 0 || newEdgeOffset) {\n\t\t\t\tedgeOffset = newEdgeOffset\n\t\t\t}\n\t\t\treturn {\n\t\t\t\tdefaultDuration: defaultDuration,\n\t\t\t\tedgeOffset: edgeOffset\n\t\t\t}\n\t\t}\n\n\t\treturn {\n\t\t\tsetup: setup,\n\t\t\tto: scrollToElem,\n\t\t\ttoY: scrollToY,\n\t\t\tintoView: scrollIntoView,\n\t\t\tcenter: scrollToCenterOf,\n\t\t\tstop: stopScroll,\n\t\t\tmoving: function () { return !!scrollTimeoutId },\n\t\t\tgetY: container.getY,\n\t\t\tgetTopOf: container.getTopOf\n\t\t}\n\n\t}\n\n\n\tvar docElem = document.documentElement\n\tvar getDocY = function () { return window.scrollY || docElem.scrollTop }\n\n\t// Create a scroller for the document:\n\tvar zenscroll = makeScroller({\n\t\tbody: document.scrollingElement || document.body,\n\t\ttoY: function (y) { window.scrollTo(0, y) },\n\t\tgetY: getDocY,\n\t\tgetHeight: function () { return window.innerHeight || docElem.clientHeight },\n\t\tgetTopOf: function (elem) { return elem.getBoundingClientRect().top + getDocY() - docElem.offsetTop }\n\t})\n\n\n\t/**\n\t * Creates a scroller from the provided container element (e.g., a DIV)\n\t *\n\t * @param {scrollContainer} The vertical position within the document.\n\t * @param {defaultDuration} Optionally a value for default duration, used for each scroll method by default.\n\t *        Ignored if 0 or null or undefined.\n\t * @param {edgeOffset} Optionally a value for the edge offset, used by each scroll method by default. \n\t *        Ignored if null or undefined.\n\t * @returns A scroller object, similar to `zenscroll` but controlling the provided element.\n\t */\n\tzenscroll.createScroller = function (scrollContainer, defaultDuration, edgeOffset) {\n\t\treturn makeScroller({\n\t\t\tbody: scrollContainer,\n\t\t\ttoY: function (y) { scrollContainer.scrollTop = y },\n\t\t\tgetY: function () { return scrollContainer.scrollTop },\n\t\t\tgetHeight: function () { return Math.min(scrollContainer.clientHeight, window.innerHeight || docElem.clientHeight) },\n\t\t\tgetTopOf: function (elem) { return elem.offsetTop }\n\t\t}, defaultDuration, edgeOffset)\n\t}\n\n\n\t// Automatic link-smoothing on achors\n\t// Exclude IE8- or when native is enabled or Zenscroll auto- is disabled\n\tif (\"addEventListener\" in window && !window.noZensmooth && !isNativeSmoothScrollEnabledOn(document.body)) {\n\n\n\t\tvar isScrollRestorationSupported = \"scrollRestoration\" in history\n\n\t\t// On first load & refresh make sure the browser restores the position first\n\t\tif (isScrollRestorationSupported) {\n\t\t\thistory.scrollRestoration = \"auto\"\n\t\t}\n\n\t\twindow.addEventListener(\"load\", function () {\n\n\t\t\tif (isScrollRestorationSupported) {\n\t\t\t\t// Set it to manual\n\t\t\t\tsetTimeout(function () { history.scrollRestoration = \"manual\" }, 9)\n\t\t\t\twindow.addEventListener(\"popstate\", function (event) {\n\t\t\t\t\tif (event.state && \"zenscrollY\" in event.state) {\n\t\t\t\t\t\tzenscroll.toY(event.state.zenscrollY)\n\t\t\t\t\t}\n\t\t\t\t}, false)\n\t\t\t}\n\n\t\t\t// Add edge offset on first load if necessary\n\t\t\t// This may not work on IE (or older computer?) as it requires more timeout, around 100 ms\n\t\t\tif (window.location.hash) {\n\t\t\t\tsetTimeout(function () {\n\t\t\t\t\t// Adjustment is only needed if there is an edge offset:\n\t\t\t\t\tvar edgeOffset = zenscroll.setup().edgeOffset\n\t\t\t\t\tif (edgeOffset) {\n\t\t\t\t\t\tvar targetElem = document.getElementById(window.location.href.split(\"#\")[1])\n\t\t\t\t\t\tif (targetElem) {\n\t\t\t\t\t\t\tvar targetY = Math.max(0, zenscroll.getTopOf(targetElem) - edgeOffset)\n\t\t\t\t\t\t\tvar diff = zenscroll.getY() - targetY\n\t\t\t\t\t\t\t// Only do the adjustment if the browser is very close to the element:\n\t\t\t\t\t\t\tif (0 <= diff && diff < 9 ) {\n\t\t\t\t\t\t\t\twindow.scrollTo(0, targetY)\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}, 9)\n\t\t\t}\n\n\t\t}, false)\n\n\t\t// Handling clicks on anchors\n\t\tvar RE_noZensmooth = new RegExp(\"(^|\\\\s)noZensmooth(\\\\s|$)\")\n\t\twindow.addEventListener(\"click\", function (event) {\n\t\t\tvar anchor = event.target\n\t\t\twhile (anchor && anchor.tagName !== \"A\") {\n\t\t\t\tanchor = anchor.parentNode\n\t\t\t}\n\t\t\t// Let the browser handle the click if it wasn't with the primary button, or with some modifier keys:\n\t\t\tif (!anchor || event.which !== 1 || event.shiftKey || event.metaKey || event.ctrlKey || event.altKey) {\n\t\t\t\treturn\n\t\t\t}\n\t\t\t// Save the current scrolling position so it can be used for scroll restoration:\n\t\t\tif (isScrollRestorationSupported) {\n\t\t\t\ttry {\n\t\t\t\t\thistory.replaceState({ zenscrollY: zenscroll.getY() }, \"\")\n\t\t\t\t} catch (e) {\n\t\t\t\t\t// Avoid the Chrome Security exception on file protocol, e.g., file://index.html\n\t\t\t\t}\n\t\t\t}\n\t\t\t// Find the referenced ID:\n\t\t\tvar href = anchor.getAttribute(\"href\") || \"\"\n\t\t\tif (href.indexOf(\"#\") === 0 && !RE_noZensmooth.test(anchor.className)) {\n\t\t\t\tvar targetY = 0\n\t\t\t\tvar targetElem = document.getElementById(href.substring(1))\n\t\t\t\tif (href !== \"#\") {\n\t\t\t\t\tif (!targetElem) {\n\t\t\t\t\t\t// Let the browser handle the click if the target ID is not found.\n\t\t\t\t\t\treturn\n\t\t\t\t\t}\n\t\t\t\t\ttargetY = zenscroll.getTopOf(targetElem)\n\t\t\t\t}\n\t\t\t\tevent.preventDefault()\n\t\t\t\t// By default trigger the browser's `hashchange` event...\n\t\t\t\tvar onDone = function () { window.location = href }\n\t\t\t\t// ...unless there is an edge offset specified\n\t\t\t\tvar edgeOffset = zenscroll.setup().edgeOffset\n\t\t\t\tif (edgeOffset) {\n\t\t\t\t\ttargetY = Math.max(0, targetY - edgeOffset)\n\t\t\t\t\tonDone = function () { history.pushState(null, \"\", href) }\n\t\t\t\t}\n\t\t\t\tzenscroll.toY(targetY, null, onDone)\n\t\t\t}\n\t\t}, false)\n\n\t}\n\n\n\treturn zenscroll\n\n\n}));\n"]}
const zenscroll = require('zenscroll');

const top = document.getElementsByClassName('top')[0];
const scroller = zenscroll.createScroller(top, 200);

window.jumpToA = () => {
  const divA = document.getElementsByClassName('a')[0];
  scroller.center(divA);
};

window.jumpToB = () => {
  const divB = document.getElementsByClassName('b')[0];
  scroller.center(divB);
};

window.jumpToC = () => {
  const divC = document.getElementsByClassName('c')[0];
  scroller.center(divC);
};
;}, 0)

package.json

{
  "name": "requirebin-sketch",
  "version": "1.0.0",
  "dependencies": {
    "zenscroll": "4.0.0"
  }
}

page-body.html

<button onclick='jumpToA()'>A (works)</button>
<button onclick='jumpToB()'>B (does not work)</button>
<button onclick='jumpToC()'>C (works)</button>
<div class='top'>
  <div class='a'>
  Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
  </div>
  <div style='position: relative'>
    <div class='b'>
    Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
    </div>
  </div>
  <div class='c'>
  Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
  </div>
</div>

page-head.html

<style>
  html {
    height: 100%; 
  }
  body {
    overflow-y: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
  }
  
  .top {
    position: relative;
    flex: 1 1;
    overflow-y: auto;
  }
 
  .a,
  .b,
  .c {
  height: 800px;
}
</style>

requirebin.md

made with requirebin