2/28/2024 0 Comments Smooth parallax cssScrollTrigger is an official GreenSock plugin for GSAP. It uses a custom, more maintained version of ScrollMagic and adds additional features like video playback, scene init breakpoints, and scene duration breakpoints. ScrollScene is essentially a wrapper to try and make ScrollMagic and/or the intersection observer more usable. However, it has become less maintained over the past few years, which lead to the creation of ScrollScene. ScrollMagic provides a relatively simple API to create various effects on scroll and can be hooked into different animation libraries like GSAP and Velocity.js. There are a few holistic scrolling libraries that attempt to give you full control over animations on scroll without you having to perform all of the calculations yourself. Some can even handle a lot of the resizing issues for you! Tools to create generic scroll behaviors This is why it’s oftentimes helpful to use a good scrolling library that can handle the throttling for you and give you a more handy API to work with. With that being said, it can also be intense on performance if it isn’t throttled correctly and doesn’t have a convenient API to create particular behaviors. It allows you to affect an element on scroll no matter where it is in terms of the viewport and set up starting and ending points exactly as you need for your project. Using the scroll event will give you the most freedom in controlling animations on scroll. Intersection observers also aren’t very helpful if you want to do any scroll animations when an element is in between and not overlapping with the start and end points. Even then, some things are difficult (though not impossible) using intersection observers, such as firing different animations depending on the direction an element enters the viewport. This makes them a good option for reveal animations. Intersection observers are great if all you need for your animation is information related to whether or not and how much of an element is visible in the viewport. There are two broad methods of using JavaScript to fire animations on scroll: using intersection observers and using the scroll event. As such, if you want to animate elements on scroll, you’ll need to use at least some JavaScript to create the effect you want. Technologies for generic scroll behaviorsĬurrently, there is no way to create or fire generic animations based on the scroll position using just CSS (though there is a proposal that could support some form of generic scroll based animations in CSS in the distant future) or to scrub through part of an animation. Plus, smooth scrolling isn’t always good in the first place. There are various JavaScript libraries that attempt to add smooth scroll support for the mousewheel action, but I’ve yet to find one that is bug-free and plays nicely with all other scroll technologies. Generic smooth scrolling that smooths out mouse wheel actions is not supported natively in all browsers at this time. Smooth scrolling is supported natively when jumping from section to section within a page using window.scrollTo() in JavaScript or even the scroll-behavior property in CSS. For a solid overview, check out this article by Preethi. That said, a polyfill is required for IE support and some mobile browsers. It’s straightforward and built into modern browsers. If all you need is for an element to stay in the same place on scroll for a portion of the page, using position: sticky is a good option. In some limited use cases, they can be sufficient for your scroll animation needs. There are a few simple native CSS scroll effects that are supported by modern browsers. Technologies for specific scroll-related behaviors I’d argue that these technologies can be broken down into two broad categories: ones for specific scroll-related behaviors and ones for more generic scroll-related behaviors. There are a number of scroll-related technologies out there, so this article’s aim is to provide an overview of them and tools to help choose the one that’s right for you. In recent years, they’ve started to become more common, perhaps in part due to devices being higher-performing and thus able to handle more animation. Scroll-related animations have been used on the web for years.
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