NB: skrolr relies on CSS transitions, and has no JavaScript backup. All modern browsers support this, but IE9- does not. Everything should work in IE10+, as well as any modern version of Firefox, Chrome, and Safari (as they auto-update). Also, the jQuery library is only included for compatibility purposes. There is no requirement to use jQuery with skrolr.

skrolr library

Live demo

GitHub | npm

✓ No dependencies.

✓ Lightweight.

✓ Easy to use.

skrolr is a JavaScript library intended to make creating responsive, easy to use marquee a piece of cake. skrolr has no dependencies (not even jQuery!), and is very lightweight, so it can be used pretty much everywhere. How small is skrolr? If all you want is the basics, it's only 396 bytes total.

Don't believe how easy it is? Here's all that's required to create a basic skrolr:

<script src="skrolr.basic.min.js"></script>
<link rel="stylesheet" href="skrolr.basic.min.css">
<ul id="obj">
	<li>1</li>
	<li>2</li>
	<li>3</li>
</ul>

<script>
let x = document.getElementById("obj");
skrolr(x);
</script>

And for a full-featured skrolr:

<script src="skrolr.es6.js"></script>
<script rel="stylesheet" href="skrolr.min.css">
<ul id="obj">
	<li>1</li>
	<li>2</li>
	<li>3</li>
</ul>

<script>
new skrolr( "obj", { // can pass an HTMLElement or ID
	waitTime: 2000,
	moveTime: 750,
	size: "100% 400px",
	arrows: true,
	buttons: true,
	numWide: [
		[   0,  500, 1],
		[ 500,  750, 2],
		[ 750, 1000, 3],
		[1000, 1250, 4],
		[1250, 1500, 5],
		[1500, 1750, 6],
		[1750,     , 7]
	]
});
</script>

What file do I use?

There are many files to choose from. If you want to do create your own API for skrolr, you probably want the basic version. For most people, you'll either want the ES6 or ES3 file, minified of course. The functionality is identical, but ES6 is smaller and much easier to read.

If you're helping in development, use the TypeScript file. Running auto-compile.js in the background (with node) does just that, automatically compiling and minifying the TypeScript to ES3 and ES6.

Timing

Let's set some timing when we initialize a skrolr.

new skrolr( "id", {
	waitTime: 1000,
	moveTime: 350
});

Stopping

What if you want to stop a skrolr?

skObject.stop();

Forward and backward

Lots of scrollers have controls to go forwards and backwards. skrolr can do that too. The best part? There's tons of ways to call it, so it's easy to remember.

skObject.forward();
skObject.backward();

Number of objects wide

Having the ability to only show a certain number of objects at a time can be immensely useful. skrolr allows you to do this by default, and it's as easy as you'd hope.

new skrolr( "id", {
	// [minSize, maxSize, numberShown]
	[   0,  500, 1], // if width of parent is 0-499px, show 1 <li> element
	[ 500,  750, 2], // " 500-749 px, show 2 <li> elements
	[ 750, 1000, 3],
	[1000, 1250, 4],
	[1250, 1500, 5],
	[1500, 1750, 6],
	[1750,     , 7] // for the highest number, don't set a maximum size
});

Transition timing

By default, skrolr uses ease-in-out for the transition-timing property in CSS. If you want to use another timing function, here's how you can set it: javascript

new skrolr( "id", {
	transitionTiming: 'linear'
});

Arrows

If you want to add forward/back arrows to skrolr, just tell skrolr to show the arrows and don't worry about anything else.

new skrolr( "id", {
	arrows: true
});

Buttons

Similar to arrows, control buttons allow you to jump to a certain location.

new skrolr( "id", {
	buttons: true
});

Size

Give skrolr a certain size with an auto-generated parent element.

new skrolr( "id", {
	width: '100%',
	height: '400px'
});

Or if you prefer a shorthand

new skrolr( "id", {
	size: '100% 400px' // width then height
});

Scroll by

It's possible to scroll by multiple elements at once. To scroll backwards, scroll by a negative number.

Scrolling by zero is allowed, but useless.

new skrolr( "id", {
	scrollBy: 1 // default value
	// scrollBy: -1 // reverse direction
});

Randomize

You can randomize the order of the children on load.

new skrolr( "id", {
	randomize: true
});

Additional features

• Stop scrolling if viewport is blurred
• Stop scrolling if element not in viewport
• Creation of object with id or HTMLElement object
• .each() method on skrolr class, allowing a function to be run on every skrolr in the page

Namespace

All JavaScript is contained within the skrolr namespace, including a custom polyfill class. All CSS is in the namespace sk-*.