Search the Community

Are you guilty of any of the most common mistakes people make in their ScrollTrigger code? Loading the wrong "ScrollTrigger" Creating to() logic issues Nesting ScrollTriggers inside multiple timeline tweens Using one ScrollTrigger for multiple "sections" Forgetting to use function-based start/end values for things that are dependent on viewport sizing Start animation mid-viewport, but reset it offscreen Why does my "scrub" animation jump on initial load? Tip: How to make scrub animations take longer Note: There's also a separate article that covers the most common GSAP mistakes. Loading the wrong "ScrollTrigger" There's a different JavaScript library out there called "ScrollTrigger" which is totally unrelated to GSAP. Avoid that! It's pretty common, for example, to add GSAP to a CodePen by typing "gsap" into the search field in JS settings but you can’t add GSAP plugins this way. Instead, just copy the whole official GSAP URL, paste it and swap "gsap.min.js" with "ScrollTrigger.min.js" (load both GSAP and the correct ScrollTrigger plugin). Or just fork the GSAP starter pen. Creating to() logic issues If you want to animate the same properties of the same element in multiple ScrollTriggers, it’s common to create logic issues like this: gsap.to('h1', { x: 100, scrollTrigger: { trigger: 'h1', start: 'top bottom', end: 'center center', scrub: true } }); gsap.to('h1', { x: 200, scrollTrigger: { trigger: 'h1', start: 'center center', end: 'bottom top', scrub: true } }); Did you catch the mistake? You might think that it will animate the x value to 100 and then directly to 200 when the second ScrollTrigger starts. However if you scroll through the page you’ll see that it animates to 100 then jumps back to 0 (the starting x value) then animates to 200. This is because the starting values of ScrollTriggers are cached when the ScrollTrigger is created. See the Pen ScrollTrigger to() logic issue by GreenSock (@GreenSock) on CodePen. To work around this either use set immediateRender: false (like this demo shows) or use .fromTo()s for the later tweens (like this demo shows) or set a ScrollTrigger on a timeline and put the tweens in that timelines instead (like this demo shows). Nesting ScrollTriggers inside multiple timeline tweens A very common mistake is applying ScrollTrigger to a bunch of tweens inside a timeline. This doesn’t make much sense because both the timeline and the ScrollTrigger would try to control the tweens' playhead. It's best to apply a ScrollTrigger to either a standalone tween or to a parent timeline. Using one ScrollTrigger for multiple "sections" If you want to apply the same effect to multiple sections/elements so that they animate when they come into view, for example, it's common for people to try to use a single tween which targets all the elements but that ends up animating them all at once. For example: See the Pen ScrollTrigger generic target issue by GreenSock (@GreenSock) on CodePen. Since each of the elements would get triggered at a different scroll position, and of course their animations would be distinct, just do a simple loop instead, like this: See the Pen ScrollTrigger generic target issue - fixed with scoping by GreenSock (@GreenSock) on CodePen. Forgetting to use function-based start/end values for things that are dependent on viewport sizing For example, let's say you've got a start or end value that references the height of an element which may change if/when the viewport resizes. ScrollTrigger will refresh() automatically when the viewport resizes, but if you hard-coded your value when the ScrollTrigger was created that won't get updated...unless you use a function-based value. end: `+=${elem.offsetHeight}` // won't be updated on refresh end: () => `+=${elem.offsetHeight}` // will be updated Additionally, if you want the animation values to update, make sure the ones you want to update are function-based values and set invalidateOnRefresh: true in the ScrollTrigger. Start animation mid-viewport, but reset it offscreen For example try scrolling down then back up in this demo: See the Pen ScrollTrigger reset issue by GreenSock (@GreenSock) on CodePen. Notice that we want the animation to start mid-screen, but when scrolling backwards we want it to reset at a completely different place (when the element goes offscreen). The solution is to use two ScrollTriggers - one for the playing and one for the resetting once the element is off screen. See the Pen ScrollTrigger reset issue - fixed with two ScrollTriggers by GreenSock (@GreenSock) on CodePen. Why does my "scrub" animation jump on initial load? Most likely the ScrollTrigger’s start value is before the starting scroll position. This usually happens when the start is something like "top bottom" (the default start value) and the element is at the very top of the page. If you don’t want this to happen simply adjust the start value to one that’s after a scroll position of 0. Tip: How to make "scrub" animations take longer The duration of a "scrub" animation will always be forced to fit exactly between the start and end of the ScrollTrigger position, so increasing the duration value won't do anything if the start and end of the ScrollTrigger stay the same. To make the animation longer, just push the end value down further. For example, instead of end: "+=300", make it "+=600" and the animation will take twice as long. If you want to add blank space between parts of a scrubbed animation, just use empty tweens as the docs cover. Still need some help? The GreenSock forums are the best place to get your questions answered. We love helping people develop their animation superpowers.

With over 100,000 posts in the popular GreenSock forums, we've noticed some common mistakes that you'd be wise to avoid. We threw in a few tips as well. Here is a summary of the mistakes: Creating from() logic issues Not setting ALL transforms with GSAP Not using xPercent and yPercent Recreating animations over and over Adding tweens to completed timelines Not using loops Importing things incorrectly Using the old/verbose syntax Creating from() logic issues It's usually smart to use .to() and .from() tweens instead of .fromTo() because they're more dynamic - they pull either the starting or ending values from whatever they happen to CURRENTLY be at the time that tween renders for the first time. It’s one of the tips in the article on animating efficiently. But be careful because that dynamic nature can bite you in a few scenarios. First, keep in mind that .from() tweens go from the provided value to the current value. Take a look at this example: See the Pen Illustrating .from() effects - Part 1 by GreenSock (@GreenSock) on CodePen. Try clicking it one time and letting it play. It works, fading in the element. Now try clicking it multiple times right after each other. The box stops showing up because it uses the current opacity as the end point which, if the animation has not completed, is some value less than 1. The fix for this is simple: use a .fromTo(). Alternatively you could create the animation beforehand and use a control method (we'll talk more about this approach later in this article). See the Pen Illustrating .from() effects - Part 1 by GreenSock (@GreenSock) on CodePen. Second, keep in mind that by default immediateRender is true by default for .from() and .fromTo() tweens because that's typically the most intuitive behavior (if you're animating from a certain value, it should start there right away). But if you create a .from() tween after a .to() tween affecting the same properties of the same object, try to figure out what will happen: const tl = gsap.timeline() tl.to(".box", {x: 100}); tl.from(".box", {x: 100}); You might expect the box to animate x from 0 to 100 and then back to 0. Or maybe you'd expect it to animate from 0 to 100 and then stay at 100. Let’s see what happens: See the Pen Illustrating .from() effects - Part 1 by GreenSock (@GreenSock) on CodePen. The box animates x from 100 to 100 and then back to 0. Why is that? By default .to() tweens wait to render until their playhead actually moves (it's a waste of CPU cycles to render at a time of 0 because nothing will have changed). But since from() has immediateRender: true, x jumps to 100 immediately on the current tick! Then it runs the .to() tween on the next tick (since it’s first in the timeline) and records the current starting value which is 100! So it animates 100 to 100 over 0.5 seconds. Then it runs the .from() tween which has the cached value of 0 as the end value. If you have several timelines affecting the same element, situations like this can be a little tricky to catch. So just be mindful of how things work when using .to() and .from() tweens. They’re very powerful but with power comes responsibility. A simple solution here is to set immediateRender: true on the .to() tween, or immediateRender: false on the .from() tween. The third situation is similar but involves repeatRefresh and repeats. Let’s say you have a situation where you want a looped animation that fades in some text and fades it out. You could create a timeline, use a .from() to fade in the text, then use a .to() to fade it out: const tl = gsap.timeline({repeat:-1}); tl.set(".text", { color: "random([green, gray, orange, pink])" }, 2); tl.from(chars, { opacity: 0 }); tl.to(chars, { opacity: 0 }); This will work just fine! Here’s the same thing but staggered using SplitText to make it look a little nicer: See the Pen Fade in and out text by GreenSock (@GreenSock) on CodePen. But this only randomizes the colors at the start. What if we want new random values each repeat? That’s where repeatRefresh comes in. Let’s add repeatRefresh: true to see what happens: See the Pen Random on Reset (wrong way) by GreenSock (@GreenSock) on CodePen. The animation plays correctly the first time but after that the elements don’t fade in a second time! Why is that? repeatRefresh uses the end values of the animation as the starting values of the next iteration. In this case, the opacity of our text elements are all 0 at the end. So when the animation gets to the .from() the second time around, the opacity animates from a value of 0 to a value of 0 since the tween is relative. What we want to do instead is always animate from a value of 0 to a value of 1 so here the easiest fix is to use a .fromTo(): See the Pen Random on Reset by GreenSock (@GreenSock) on CodePen. Now it does what we want. There are other solutions like using a .set() before the .from() but most often it’s easiest to just use a .fromTo() in cases like this. Not setting ALL transforms with GSAP If you are going to animate an element with GSAP, even the initial transform values (including on SVG elements) should be set with GSAP because it delivers better: Accuracy - The browser always reports computed values in pixels, thus it's impossible for GSAP to discern when you use another unit like % or vw in your CSS rule. Also, computed values are in matrix() or matrix3d() which are inherently ambiguous when it comes to rotation and scale. The matrix for 0, 360, and 720 degrees are identical. A scaleX of -1 results in the same matrix as something with rotation of 180 degrees and scaleY of -1. There are infinite combinations that are identical, but when you set transform-related values with GSAP, everything is saved in a perfectly accurate way. Performance - GSAP caches transform-related values to make things super fast. Parsing all of the components from a computed value is more expensive. If you are worried about a flash of unstyled content, you can handle that by using a technique that hides the element initially and then shows it via JavaScript as this post covers. Or you can set the initial styles with CSS rules and ALSO set them in GSAP. Not using xPercent and yPercent Did you know that you can combine percentage-based translation and other units? This is super useful if, for example, you'd like to align the center of an element with a particular offset, like {xPercent: -50, yPercent: -50, x: 100, y: 300}. We often see people use percent values in the x and y properties which is technically possible but can cause confusion at times. For example, if you set x and y to "-50%" and then later you set xPercent: -50, you'd see it move as if it's at xPercent: -100 because the x and xPercent both have -50%. Whenever you're setting a percentage-based translation, it's typically best to use the xPercent and yPercent properties. // Not recommended x: "50%", y: "50%", // Recommended xPercent: 50, yPercent: 50 Recreating animations over and over Creating your tweens and timelines beforehand has several advantages: Performance - Instead of having to create them right as they’re needed, you can do it ahead of time. Additionally, you need fewer instances of animations. Most of the time you’d never notice, but it’s good practice. Simplified logic - This is especially true when related to user interaction events. Freedom - Want to pause an animation when an event happens? Do it. Want to reverse an animation when the user does something? No problem. This sort of thing is much more difficult to handle when you create animations inside of event callbacks. Most of the time when you create animations beforehand, you will want to keep them paused until they’re needed. Then you can use control methods like .play(), .pause(), .reverse(), .progress(), .seek(), .restart(), and .timeScale() to affect their play state. Here’s a simple example: See the Pen Playing and reversing an animation on hover by GreenSock (@GreenSock) on CodePen. For more information related to creating animations beforehand, you can see the animating efficiently article. One exception to this rule is when you need things to be dynamic, like if the initial values may vary. For example, if you’re animating the height of the bars in a chart between various states and the user may click different buttons quickly, it’d make sense to create the animation each time to ensure they flow from whatever the current state is (even if it's mid-tween) like the demo below. See the Pen Playing and reversing an animation on hover by GreenSock (@GreenSock) on CodePen. Adding tweens to completed timelines A common pattern of mistakes that I’ve seen goes like this: const tl = gsap.timeline() tl.to(myElem, { x: 100 }); myElem.addEventListener("click", () => tl.to(myElem, { x: 300 }) ); Did you catch the mistake? If you add new tweens to a timeline that is already completed, they won’t be called unless you re-run the timeline. Almost always in these situations you should just use control methods for a previously created animation or create a new animation instead (not using an existing timeline) following the guidelines that we covered in the previous section. Not using loops If you want to apply the same effect to multiple elements (sections, cards, buttons, etc.) when a certain event happens to each one, you should almost always use a loop. For example, don’t use a selector like "button" when you want it to affect just one button. For example, if you wanted to fire an effect when each button is clicked: // BAD: immediately animates ALL buttons at once! gsap.effects.explode("button", { direction: "up", duration: 3 }); // GOOD: animation is specific to each button, and only when clicked gsap.utils.toArray("button").forEach(btn => btn.addEventListener("click", () => gsap.effects.explode(btn, { direction: "up", duration: 3 })) }); Inside of this loop, you can use a selector that is scoped to the given element so that you're only getting things INSIDE that element. For example: gsap.utils.toArray(".container").forEach(container => { let info = container.querySelector(".information"), silhouette = container.querySelector(".silhouette .cover"), tl = gsap.timeline({ paused: true }); tl.to(info, { yPercent: 0 }) .to(silhouette, { opacity: 0 }, 0); container.addEventListener("mouseenter", () => tl.play() ); container.addEventListener("mouseleave", () => tl.reverse() ); }); See the Pen Who's That Pokémon? - forEach example demo by GreenSock (@GreenSock) on CodePen. Importing GSAP incorrectly A common issue people face when using GSAP in a module environment is importing GSAP or its plugins incorrectly. Most of the time import errors error can be avoided by thoroughly reading the relevant parts of the installation page. I won't copy all of the details into this post, but be sure to make use of that page if you're facing any sort of import error. It even has a very handy GSAP install helper tool that can generate the correct import code to use in most environments. Using the old/verbose syntax Drop the Lite/Max I regularly see people using the old syntax even though they are loading GSAP 3. Old habits die hard. Even though the old syntax still technically works, the new modern GSAP 3 syntax is sleeker and simpler. Plus the old syntax won't be supported in GSAP 4 (which is far off in the future, but it's still a good idea to write future-friendly code). For example instead of using something that has Lite/Max in it, just use gsap: // old TweenLite.to() TweenMax.from() new TimelineMax() // new gsap.to() gsap.from() gsap.timeline() Use the string form for eases The shorter string form of eases requires less typing and lets you avoid extra import statements in module environments. // old Power2.easeOut Sine.easeInOut // new "power2" // The default is .out "sine.inOut" Duration belongs in the vars parameter Putting the duration inside of the vars parameter does require a bit more typing, but it makes things more readable and intuitive. GSAP’s defaults and effects are very helpful but you can’t make use of them if you’re putting the duration as the second parameter. // old gsap.to(elem, 1, { x: 100 }); // new gsap.to(elem, { duration: 1, x: 100}); // using GSAP’s defaults: const tl = gsap.timeline({ defaults: { duration: 1 } }); tl.to(elem, { x: 100 }); // no duration necessary! tl.to(elem, { y: 100, duration: 3 }); // easily overwrite the default value For a more full listing of changes in GSAP 3, check out the GSAP 3 Migration Guide. Numerical values don’t usually need to be strings For example if you want to set the x transform to 100 pixels, you don’t need to say x: "100px", you can just say x: 100. Simple! The only time when you need to pass numerical values as strings are if you need to change the unit (like x: "10vw") or pass in a complex value (like transformOrigin: "0px 50px"). The target of a tween can be a selector string I often see people do something like this: gsap.to(document.querySelectorAll(".box"), { x: 100 }); Or even with jQuery: gsap.to($(".box"), { x: 100 }); Both of the above will work but could be simplified by passing a selector string in as the target; GSAP will automatically use .querySelectorAll() to get a list of all of the elements that match. So the above can be written simple as gsap.to(".box", { x: 100 }); You could also pass in a complex selector string like ".box, .card" and it will select all boxes and cards. Or use an Array of elements so long as they are of the same type (selector string, variable reference, generic object, etc.). Conclusion So how'd you do? Is your GSAP code clear of these common mistakes? Hopefully you learned a few things. As always, if you need any help, the GreenSock forums are a fantastic resource. We love to help people develop their animation superpowers. If you're looking for another great learning resource, read how to animate efficiently! Now go forth and tween responsibly!

Learn to control your animations on scroll with GreenSock's powerful ScrollTrigger in this mini-course by SnorklTV.

This is a guest post from one of the best teachers of GSAP, Carl Schooff, also known as SnorklTV. If you're new to GSAP or just looking to learn about the GSAP 3 syntax, his video courses are second to none! I can't tell you how many hundred's of questions I've seen in the GreenSock forums about controlling GSAP animations on scroll. I'm so happy there is finally a genuine GreenSock tool to power the future of scroll-driven animations. Before I get into the specifics, it's worth a moment of time to honor those that got us here. A short history of Scroll-driven Animations John Polacek paved the way in 2013 with Superscrollorama, a jQuery plugin that used GSAP under the hood. Many amazing sites were created with this highly-acclaimed, ground-breaking, and trend-setting tool. In 2014 Jan Paepke took the reins and did a complete re-write and SuperScrollarama became ScrollMagic. ScrollMagic was hugely successful as it offered a slew of new features. Excellent demo files made the tool easy for beginners to understand. Awards sites exploded with many clever effects made with the ScrollMagic and GSAP combo. However, as with many solo-led open source projects, it's popularity created a hefty support burden that couldn't be managed. As issues went unanswered in the ScrollMagic repo, more users found their way to the GreenSock forums asking for support on a product GreenSock didn't create or have any way of fixing. ScrollTrigger is born On June 1st, 2020, GreenSock released ScrollTrigger to a sold out audience via a historic YouTube Premiere. ScrollTrigger was built with a totally fresh perspective on how GreenSock animations should be controlled via scroll. Not only does the API offer more features than it's predecessors, but it has a strong focus on performance which really shines in this "mobile-first" world. And as you can expect with any GreenSock product support is phenomenal. For a full list of features, you'll need to check out GreenSock's ScrollTrigger API Docs, but my job here is to get you up and running quickly... so let's go! Watch the Video This video is from my course GSAP 3 Express. I've got over 6 hours of training and loads of exclusive demos to help you master the GreenSock Animation Platform from the ground up at creativeCodingClub.com As always, I load my videos up with info so that I don't have to write a ton of stuff, but here are some key points. Get ScrollTrigger and GSAP ScrollTrigger is hosted on a CDN along with GSAP. Just use the script tags below to load it into your page. <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.5.1/gsap.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.5.1/ScrollTrigger.min.js"></script> Register ScrollTrigger It's recommended to register ScrollTrigger in your JavaScript to avoid tree-shaking with build tools. gsap.registerPlugin(ScrollTrigger); You can get recent CDN Urls from the GSAP Overview in the docs. For use with npm or more advanced build tools check out the GSAP installation videos. Super Basic Demo with a Single Tween The animation is super slow so that you can see how the animation reacts to entering and leaving the scroller-start and scroller-end positions. See the Pen ScrollTrigger QuickStart by Snorkl.tv (@snorkltv) on CodePen. Control a Timeline with ScrollTrigger See the Pen GreenSock ScrollTrigger Timeline by Snorkl.tv (@snorkltv) on CodePen. GreenSock's Toggle Action Demo In the video I explained how toggleActions work and how important they are. For each toggle event (onEnter, onLeave, onEnterBack, onLeaveBack) you can assign an action (play, pause, restart, reset, resume, complete, reverse, none). You'll assign a toggleAction via a 4-part string like "restart pause resume reverse". The best way to understand how they work is to play with the values in the demos above and study the demo below. See the Pen toggleActions - ScrollTrigger by GreenSock (@GreenSock) on CodePen. I'm hoping these resources help get you up and running quickly. For more inspiration check GreenSock's massive collection of ScrollTrigger Demos. What's next? I've only scratched the surface of what ScrollTrigger can do. I'll definitely be creating more training on this awesome tool. If you need help learning GSAP and want to take your skills to the next level check out my courses at CreativeCodingClub.com.