JSFiddle - React, Tailwind, and code Playground

by Thomas Gladdines

HTML

<h1>HTML Ipsum Presents</h1>
	       
<p><strong>Pellentesque habitant morbi tristique</strong> senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. <em>Aenean ultricies mi vitae est.</em> Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, <code>commodo vitae</code>, ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis tempus lacus enim ac dui. <a href="#">Donec non enim</a> in turpis pulvinar facilisis. Ut felis.</p>

<h2>Header Level 2</h2>

<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
	       
<ol>
   <li>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</li>
   <li>Aliquam tincidunt mauris eu risus.</li>
</ol>

<blockquote><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus magna. Cras in mi at felis aliquet congue. Ut a est eget ligula molestie gravida. Curabitur massa. Donec eleifend, libero at sagittis mollis, tellus est malesuada tellus, at luctus turpis elit sit amet quam. Vivamus pretium ornare est.</p></blockquote>

<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>

<h3>Header Level 3</h3>

<ul>
   <li>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</li>
   <li>Aliquam tincidunt mauris eu risus.</li>
</ul>

<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas....

JavaScript

(function iDirection() {
	var preventLoop = true;
	var currentScroll = scrollTop();
	function scroll() {
		if(preventLoop) {
			
			//Get new scroll position 
			var newScroll = scrollTop();
			
			//Get new scroll height
			var newScrollHeight = scrollHeight();

			//Stop scrolling
			preventLoop = false;
			freeze(newScroll);
			
			//Check direction
			var move = 500;
			
			if(newScroll > currentScroll) {
				move = newScrollHeight - newScroll - $(window).height() > move ? move : newScrollHeight - newScroll - $(window).height();
				//scroll down animation  here
				$("html").animate({
					top: "-="+move+"px"
				}, 2000);
			} else {
				move = newScroll < move ? newScroll : move;
				//scroll up animation here
				$("html").animate({
					top: "+="+move+"px"
				}, 2000);
			}

			/*
			Time in milliseconds the scrolling is disabled,
			in most cases this is equal to the time the animation takes
			*/
			setTimeout(function() {
				//Enable scrolling
				unfreeze();

				//Update scroll position
				currentScroll = scrollTop();
				/*
				Wait 100ms before enabling the direction function again
				(to prevent a loop from occuring).
				*/
				setTimeout(function() {
					preventLoop = true;
				}, 100);
			}, 2000);
		}
	}
	$(window).on("scroll", scroll);
})();

//Helper functions
function freeze(top) {
	if(window.innerWidth > document.documentElement.clientWidth) {
		$("html").css("overflow-y", "scroll");
	}
	$("html").css({"width": "100%", "height": "100%", "position": "fixed", "top": -top});
}
function unfreeze() {
	$("html").css("position", "static");
	$("html, body").scrollTop(-parseInt($("html").css("top")));
	$("html, body").scrollLeft(-parseInt($("html").css("left")));
	$("html").css({"position": "", "width": "", "height": "", "top": "", "left": "", "overflow-y": "", "overflow-x": ""});
}
function scrollTop() {
	return $("html").scrollTop() ? $("html").scrollTop() : $("body").scrollTop();
}
function scrollHeight() {
    return...