Ulala

Show the right things when you scroll

Usage

Include the script in your page. I suggest you to use the RAWGIT CDN.

<script src="https://unpkg.com/kopiro/ulala/master/ulala.min.js"></script>
<script>
  Ulala.init(/* config */);
</script>

Features out of the box

Lazy loading

Just set data-image=[URL] to your tag HTML. The image will be loaded when it's visible and the -loaded class will be added.

If the tag is an IMG, the src attribute will be used. Otherwise, the image will be applied with a background-image.

Futhermore, unless you don't specify noSuffixes: true the image path will be rewritten based on device pixel ratio and the width.

Waypoint

Set data-waypoint on your tag, and when the scroll reach your element, the -visible class will be added.

NOTE: If the tag is an image or a lazy loading image, the class will be added only when the image is fully loaded.

Parallax

Set the data-parallax=[RATIO] on your image, and wrap it in a simple <div data-parallax-wrapper></div>.

So the HTML must looks like this:

<div data-parallax-wrapper>
    <img data-parallax="0.5" src="[URL]" />
</div>

The ratio value sets how much enlarge the image to apply the parallax; the default value is 0.25.

Config in .init()

Property	Default	Description
preloadIn	1	Ratio of the window to trigger the loading
visibilityIn	0	Ratio of the window to trigger the visibility
visibleClass	-visible	The class to add when visible
loadedClass	-loaded	The class to add when an image is loaded
useSuffixes	true	Tell the lib to use / not use suffix for images (like @2x

LICENSE

MIT