infinite slider

[Last]

Can anyone help me transform this carousel into infinity? Every time it reaches the end it returns to the beginning, leaving it infinity? I believe you should use wrap but I couldn't understand how to do that.

 

 

'use client';

 

import { useLayoutEffect, useRef } from 'react';

import gsap from 'gsap';

import { ScrollTrigger } from 'gsap/all';

 

const Carousel = () => {

  const slider = useRef(null);

  const firstSlider = useRef(null);

  const secondSlider = useRef(null);

  let xPercent = 0;

  let direction = -1;

 

  useLayoutEffect(() => {

    gsap.registerPlugin(ScrollTrigger);

    gsap.to(slider.current, {

      scrollTrigger: {

        trigger: document.documentElement,

        scrub: 0.25,

        start: 0,

        end: window.innerHeight,

        onUpdate: (e) => (direction = e.direction * -1),

      },

      // x: '-500px',

    });

    requestAnimationFrame(animate);

  }, []);

 

  const animate = () => {

    if (xPercent < -100) {

      xPercent = 0;

    } else if (xPercent > 0) {

      xPercent = -100;

    }

    gsap.set(firstSlider.current, { xPercent: xPercent * -1 });

    gsap.set(secondSlider.current, { xPercent: xPercent });

    requestAnimationFrame(animate);

    xPercent += 0.01 * direction;

  };

 

  return (

    <div

      ref={slider}

      className='flex flex-col items-center justify-center w-full h-full gap-y-10'

    >

      <div

        className='flex gap-x-10'

        ref={firstSlider}

      >

        {Array(20)

          .fill(null)

          .map((item, index) => (

            <div

              key={index}

              className='bg-blue-500 w-36 h-36'

            >

              {index}

            </div>

          ))}

      </div>

 

      <div

        className='flex gap-x-10'

        ref={secondSlider}

      >

        {Array(20)

          .fill(null)

          .map((item, index) => (

            <div

              key={index}

              className='bg-purple-500 w-36 h-36'

            >

              {index}

            </div>

          ))}

      </div>

    </div>

  );

};

 

export default Carousel;

 

 

[GSAP Helper]

Without a minimal demo, it's very difficult to troubleshoot; the issue could be caused by CSS, markup, a third party library, a 3rd party script, etc. Would you please provide a very simple CodePen or Stackblitz that illustrates the issue? 

 

Please don't include your whole project. Just some colored <div> elements and the GSAP code is best. See if you can recreate the issue with as few dependencies as possible. Start minimal and then incrementally add code bit by bit until it breaks. Usually people solve their own issues during this process! If not, at least we have a reduced test case which greatly increases your chances of getting a relevant answer.

 

See the Pen aYYOdN by GreenSock (@GreenSock) on CodePen

that loads all the plugins. Just click "fork" at the bottom right and make your minimal demo: 

 

Using a framework/library like React, Vue, Next, etc.? 

CodePen isn't always ideal for these tools, so here are some Stackblitz starter templates that you can fork and import the gsap-trial NPM package for using any of the bonus plugins: 

• React (please read this article!)
• Next
• Svelte
• Sveltekit
• Vue
• Nuxt

 

Please share the StackBlitz link directly to the file in question (where you've put the GSAP code) so we don't need to hunt through all the files. 

 

Once we see an isolated demo, we'll do our best to jump in and help with your GSAP-specific questions. ✅

[Rodrigo]

Hi @Last and welcome to the GSAP Forums!

 

Besides echoing the need for a minimal demo I'm super curious about why you're doing this:

const animate = () => {
  if (xPercent < -100) {
    xPercent = 0;
  } else if (xPercent > 0) {
    xPercent = -100;
  }
  gsap.set(firstSlider.current, { xPercent: xPercent * -1 });
  gsap.set(secondSlider.current, { xPercent: xPercent });
  requestAnimationFrame(animate);
  xPercent += 0.01 * direction;
};

Finally maybe you're looking for our Seamless Horizontal Loop helper function:

https://gsap.com/docs/v3/HelperFunctions/helpers/seamlessLoop

 

Here are a couple of demos in React using our useGSAP hook:

https://stackblitz.com/edit/vitejs-vite-auctqy?file=src%2FApp.jsx

 

https://stackblitz.com/edit/vitejs-vite-cljwjs?file=src%2FApp.jsx

 

Hopefully this helps.

Happy Tweening!

[Last]

Thank you, thanks to the links I managed to solve my problem. I just have one last question now, which of the two approaches is more performant using 2 useGSAP or just 1 useGSAP.

I'm currently only using useGSAP but I would like to know if I can start using several useGSAP in my application without problems

 

Thank you for your help🤝

 

 

 // useGSAP(
  //   () => {
  //     const speed = 2.5;

  //     const loop = horizontalLoop('.nft-card-left', {
  //       repeat: -1,
  //       speed: 1.5,
  //       paddingRight: 16,
  //     });

  //     let tl;

  //     Observer.create({
  //       target: window,
  //       type: 'wheel',
  //       onChangeY: (self) => {
  //         tl && tl.kill();
  //         const factor = self.deltaY > 0 ? 1 : -1;
  //         tl = gsap
  //           .timeline()
  //           .to(loop, { timeScale: speed * factor, duration: 0.25 })
  //           .to(loop, { timeScale: 1 * factor, duration: 1 });
  //       },
  //     });
  //   },
  //   {
  //     scope: container,
  //   },
  // );

  // useGSAP(
  //   () => {
  //     const speed = 2.5;

  //     const loop = horizontalLoop('.nft-card', {
  //       reversed: 1,
  //       repeat: -1,
  //       speed: 1.5,
  //       paddingRight: 16,
  //     });

  //     let tl;

  //     Observer.create({
  //       target: window,
  //       type: 'wheel',
  //       onChangeY: (self) => {
  //         tl && tl.kill();
  //         const factor = self.deltaY > 0 ? -1 : 1;
  //         tl = gsap
  //           .timeline()
  //           .to(loop, { timeScale: speed * factor, duration: 0.25 })
  //           .to(loop, { timeScale: 1 * factor, duration: 1 });
  //       },
  //     });
  //   },
  //   {
  //     scope: container,
  //   },
  // );

  useGSAP(
    () => {
      const speed = 2.5;

      const loopLeft = horizontalLoop('.nft-card-left', {
        repeat: -1,
        speed: 1.5,
        paddingRight: 16,
      });

      const loopRight = horizontalLoop('.nft-card', {
        reversed: 1,
        repeat: -1,
        speed: 1.5,
        paddingRight: 16,
      });

      let tlLeft, tlRight;

      Observer.create({
        target: window,
        type: 'wheel',
        onChangeY: (self) => {
          tlLeft && tlLeft.kill();
          tlRight && tlRight.kill();

          const factor = self.deltaY > 0 ? -1 : 1;
          const factorLeft = self.deltaY > 0 ? 1 : -1;

          tlLeft = gsap
            .timeline()
            .to(loopLeft, { timeScale: speed * factorLeft, duration: 0.25 })
            .to(loopLeft, { timeScale: 1 * factorLeft, duration: 1 });

          tlRight = gsap
            .timeline()
            .to(loopRight, { timeScale: speed * factor, duration: 0.25 })
            .to(loopRight, { timeScale: 1 * factor, duration: 1 });
        },
      });
    },
    {
      scope: container,
    },
  );

 

 

 

[Rodrigo]

Hi,

 

Performance-wise there shouldn't be any issues whatsoever, but in terms of code logic and maintenance is far better to use just one useGSAP hook.

 

Happy Tweening!