Basic GSAP Slider (Watch CSS) [Resource]

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Webflow

Code

Setup: External Scripts

HTML

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<script src="https://cdn.jsdelivr.net/npm/gsap@3.13.0/dist/gsap.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.13.0/dist/Draggable.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.13.0/dist/InertiaPlugin.min.js"></script>

Step 1: Copy structure to Webflow

Copy to Webflow

Webflow structure is not required for this resource.

Step 1: Add HTML

HTML

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<div aria-label="Slider" data-gsap-slider-init="" role="region" aria-roledescription="carousel" class="gsap-slider">
  <div data-gsap-slider-collection="" class="gsap-slider__collection">
    <div data-gsap-slider-list="" class="gsap-slider__list">
      <!-- Slide 1 -->
      <div data-gsap-slider-item="" class="gsap-slider__item">
        <div class="demo-card">
          <div class="before__125"></div>
          <svg xmlns="http://www.w3.org/2000/svg" width="100%" viewbox="0 0 160 160" fill="none" class="osmo-icon-svg"><path d="M94.8284 53.8578C92.3086 56.3776 88 54.593 88 51.0294V0H72V59.9999C72 66.6273 66.6274 71.9999 60 71.9999H0V87.9999H51.0294C54.5931 87.9999 56.3777 92.3085 53.8579 94.8283L18.3431 130.343L29.6569 141.657L65.1717 106.142C67.684 103.63 71.9745 105.396 72 108.939V160L88.0001 160L88 99.9999C88 93.3725 93.3726 87.9999 100 87.9999H160V71.9999H108.939C105.407 71.9745 103.64 67.7091 106.12 65.1938L106.142 65.1716L141.657 29.6568L130.343 18.3432L94.8284 53.8578Z" fill="currentColor"></path></svg>
          <div class="demo-card__tag"><p class="demo-card__tag-p">Slide 1</p></div>
        </div>
      </div>
      <!-- Slide 2 -->
      <div data-gsap-slider-item="" class="gsap-slider__item">
        <div class="demo-card">
          <div class="before__125"></div>
          <svg xmlns="http://www.w3.org/2000/svg" width="100%" viewbox="0 0 160 160" fill="none" class="osmo-icon-svg"><path d="M94.8284 53.8578C92.3086 56.3776 88 54.593 88 51.0294V0H72V59.9999C72 66.6273 66.6274 71.9999 60 71.9999H0V87.9999H51.0294C54.5931 87.9999 56.3777 92.3085 53.8579 94.8283L18.3431 130.343L29.6569 141.657L65.1717 106.142C67.684 103.63 71.9745 105.396 72 108.939V160L88.0001 160L88 99.9999C88 93.3725 93.3726 87.9999 100 87.9999H160V71.9999H108.939C105.407 71.9745 103.64 67.7091 106.12 65.1938L106.142 65.1716L141.657 29.6568L130.343 18.3432L94.8284 53.8578Z" fill="currentColor"></path></svg>
          <div class="demo-card__tag"><p class="demo-card__tag-p">Slide 2</p></div>
        </div>
      </div>
      <!-- Etc. -->
    </div>
  </div>
  <div data-gsap-slider-controls="" class="gsap-slider__controls">
    <button data-gsap-slider-control="prev" class="gsap-slider__control">Prev</button>
    <button data-gsap-slider-control="next" class="gsap-slider__control">Next</button>
  </div>
</div>

HTML structure is not required for this resource.

Step 2: Add CSS

CSS

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.gsap-slider {
  grid-column-gap: 3em;
  grid-row-gap: 3em;
  flex-flow: column;
  align-items: center;
  width: 100%;
  padding-left: 5vw;
  padding-right: 5vw;
  display: flex;
  position: relative;
  overflow: hidden;
}

.gsap-slider__collection {
  width: 100%;
  max-width: 72em;
}

.gsap-slider__list {
  -webkit-user-select: none;
  user-select: none;
  will-change: transform;
  touch-action: pan-y;
  backface-visibility: hidden;
  display: flex;
}

.gsap-slider__item {
  width: calc(((100% - 1px)  - (var(--slider-spv)  - 1) * var(--slider-gap)) / var(--slider-spv));
  margin-right: var(--slider-gap);
  flex: none;
}

.demo-card {
  background-color: #2c2c2c;
  border: 1px solid #2c2c2c;
  border-radius: 1.5em;
  justify-content: center;
  align-items: center;
  width: 100%;
  display: flex;
  position: relative;
  overflow: hidden;
}

.before__125 {
  padding-top: 125%;
}

.osmo-icon-svg {
  opacity: .1;
  width: 40%;
  position: absolute;
}

.demo-card__tag {
  position: absolute;
  top: 2em;
  left: 2em;
}

.demo-card__tag-p {
  margin-bottom: 0;
  font-size: 2em;
  line-height: 1;
}

/* Setup */

[data-gsap-slider-init] {
  --slider-status: on; /* Turn slider on/off */
  --slider-spv: 3; /* Slides per view */ 
  --slider-gap: 1.5em; /* Slides Gap */
}

@media screen and (max-width: 991px) {
   [data-gsap-slider-init] {
    --slider-status: on; /* Turn slider on/off */
    --slider-spv: 2.25; /* Slides per view */ 
    --slider-gap: 1.5em; /* Slides Gap */
  } 
}

@media screen and (max-width: 767px) {
  [data-gsap-slider-init] { 
    --slider-status: on; /* Turn slider on/off */
    --slider-spv: 1.15; /* Slides per view */ 
    --slider-gap: 1em; /* Gap */
  }
}

[data-gsap-slider-item]:last-child {
  margin-right: 0;
}

/* Controls */

.gsap-slider__controls {
  grid-column-gap: .5em;
  grid-row-gap: .5em;
  justify-content: center;
  align-items: center;
  display: flex;
}

.gsap-slider__control {
  color: #efeeec;
  background-color: #131313;
  border: 1px solid #2c2c2c;
  border-radius: .25em;
  padding: .75em 1.5em;
  font-size: 1em;
}

[data-gsap-slider-status="not-active"] [data-gsap-slider-controls] {
  display: none;
}

[data-gsap-slider-control-status="not-active"] { 
  opacity: 0.2;
  pointer-events: none;
}

/* Customization */

.gsap-slider__control {
  transition: opacity 0.3s ease;
}

.demo-card {
  transition: all 0.3s ease;
}

[data-gsap-slider-item-status="not-active"] .demo-card {
  background-color: #131313;
}

.demo-card__tag {
  transition: all 0.3s ease;
}

[data-gsap-slider-item-status="not-active"] .demo-card__tag {
  opacity: 0;
}

Step 2: Add custom Javascript

Step 2: Add Javascript

Step 3: Add Javascript

Javascript

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gsap.registerPlugin(Draggable, InertiaPlugin);

function initBasicGSAPSlider() {
  document.querySelectorAll('[data-gsap-slider-init]').forEach(root => {
    if (root._sliderDraggable) root._sliderDraggable.kill();

    const collection = root.querySelector('[data-gsap-slider-collection]');
    const track      = root.querySelector('[data-gsap-slider-list]');
    const items      = Array.from(root.querySelectorAll('[data-gsap-slider-item]'));
    const controls   = Array.from(root.querySelectorAll('[data-gsap-slider-control]'));

    // Inject aria attributes
    root.setAttribute('role','region');
    root.setAttribute('aria-roledescription','carousel');
    root.setAttribute('aria-label','Slider');
    collection.setAttribute('role','group');
    collection.setAttribute('aria-roledescription','Slides List');
    collection.setAttribute('aria-label','Slides');
    items.forEach((slide,i) => {
      slide.setAttribute('role','group');
      slide.setAttribute('aria-roledescription','Slide');
      slide.setAttribute('aria-label',`Slide ${i+1} of ${items.length}`);
      slide.setAttribute('aria-hidden','true');
      slide.setAttribute('aria-selected','false');
      slide.setAttribute('tabindex','-1');
    });
    controls.forEach(btn => {
      const dir = btn.getAttribute('data-gsap-slider-control');
      btn.setAttribute('role','button');
      btn.setAttribute('aria-label', dir==='prev' ? 'Previous Slide' : 'Next Slide');
      btn.disabled = true;
      btn.setAttribute('aria-disabled','true');
    });

    // Determine if slider runs
    const styles      = getComputedStyle(root);
    const statusVar   = styles.getPropertyValue('--slider-status').trim();
    let   spvVar      = parseFloat(styles.getPropertyValue('--slider-spv'));
    const rect        = items[0].getBoundingClientRect();
    const marginRight = parseFloat(getComputedStyle(items[0]).marginRight);
    const slideW      = rect.width + marginRight;
    if (isNaN(spvVar)) {
      spvVar = collection.clientWidth / slideW;
    }
    const spv           = Math.max(1, Math.min(spvVar, items.length));
    const sliderEnabled = statusVar==='on' && spv < items.length;
    root.setAttribute('data-gsap-slider-status', sliderEnabled ? 'active' : 'not-active');

    if (!sliderEnabled) {
      // Teardown when disabled
      track.removeAttribute('style');
      track.onmouseenter = null;
      track.onmouseleave = null;
      track.removeAttribute('data-gsap-slider-list-status');
      root.removeAttribute('role');
      root.removeAttribute('aria-roledescription');
      root.removeAttribute('aria-label');
      collection.removeAttribute('role');
      collection.removeAttribute('aria-roledescription');
      collection.removeAttribute('aria-label');
      items.forEach(slide => {
        slide.removeAttribute('role');
        slide.removeAttribute('aria-roledescription');
        slide.removeAttribute('aria-label');
        slide.removeAttribute('aria-hidden');
        slide.removeAttribute('aria-selected');
        slide.removeAttribute('tabindex');
        slide.removeAttribute('data-gsap-slider-item-status');
      });
      controls.forEach(btn => {
        btn.disabled = false;
        btn.removeAttribute('role');
        btn.removeAttribute('aria-label');
        btn.removeAttribute('aria-disabled');
        btn.removeAttribute('data-gsap-slider-control-status');
      });
      return;
    }

    // Track hover state
    track.onmouseenter = () => {
      track.setAttribute('data-gsap-slider-list-status','grab');
    };
    track.onmouseleave = () => {
      track.removeAttribute('data-gsap-slider-list-status');
    };

    //Ccalculate bounds and snap points
    const vw        = collection.clientWidth;
    const tw        = track.scrollWidth;
    const maxScroll = Math.max(tw - vw, 0);
    const minX      = -maxScroll;
    const maxX      = 0;
    const maxIndex  = maxScroll / slideW;
    const full      = Math.floor(maxIndex);
    const snapPoints = [];
    for (let i = 0; i <= full; i++) {
      snapPoints.push(-i * slideW);
    }
    if (full < maxIndex) {
      snapPoints.push(-maxIndex * slideW);
    }

    let activeIndex    = 0;
    const setX         = gsap.quickSetter(track,'x','px');
    let collectionRect = collection.getBoundingClientRect();

    function updateStatus(x) {
      if (x > maxX || x < minX) {
        return;
      }

      // Clamp and find closest snap
      const calcX = x > maxX ? maxX : (x < minX ? minX : x);
      let closest = snapPoints[0];
      snapPoints.forEach(pt => {
        if (Math.abs(pt - calcX) < Math.abs(closest - calcX)) {
          closest = pt;
        }
      });
      activeIndex = snapPoints.indexOf(closest);

      // Update Slide Attributes
      items.forEach((slide,i) => {
        const r           = slide.getBoundingClientRect();
        const leftEdge    = r.left - collectionRect.left;
        const slideCenter = leftEdge + r.width/2;
        const inView      = slideCenter > 0 && slideCenter < collectionRect.width;
        const status      = i === activeIndex ? 'active' : inView ? 'inview' : 'not-active';

        slide.setAttribute('data-gsap-slider-item-status', status);
        slide.setAttribute('aria-selected',    i === activeIndex ? 'true' : 'false');
        slide.setAttribute('aria-hidden',      inView ? 'false' : 'true');
        slide.setAttribute('tabindex',         i === activeIndex ? '0'    : '-1');
      });

      // Update Controls
      controls.forEach(btn => {
        const dir = btn.getAttribute('data-gsap-slider-control');
        const can = dir === 'prev'
          ? activeIndex > 0
          : activeIndex < snapPoints.length - 1;

        btn.disabled = !can;
        btn.setAttribute('aria-disabled', can ? 'false' : 'true');
        btn.setAttribute('data-gsap-slider-control-status', can ? 'active' : 'not-active');
      });
    }

    controls.forEach(btn => {
      const dir = btn.getAttribute('data-gsap-slider-control');
      btn.addEventListener('click', () => {
        if (btn.disabled) return;
        const delta = dir === 'next' ? 1 : -1;
        const target = activeIndex + delta;
        gsap.to(track, {
          duration: 0.4,
          x: snapPoints[target],
          onUpdate: () => updateStatus(gsap.getProperty(track,'x'))
        });
      });
    });

    // Initialize Draggable
    root._sliderDraggable = Draggable.create(track, {
      type: 'x',
      // cursor: 'inherit',
      // activeCursor: 'inherit',
      inertia: true,
      bounds: {minX, maxX},
      throwResistance: 2000,
      dragResistance: 0.05,
      maxDuration: 0.6,
      minDuration: 0.2,
      edgeResistance: 0.75,
      snap: {x: snapPoints, duration: 0.4},
      onPress() {
        track.setAttribute('data-gsap-slider-list-status','grabbing');
        collectionRect = collection.getBoundingClientRect();
      },
      onDrag() {
        setX(this.x);
        updateStatus(this.x);
      },
      onThrowUpdate() {
        setX(this.x);
        updateStatus(this.x);
      },
      onThrowComplete() {
        setX(this.endX);
        updateStatus(this.endX);
        track.setAttribute('data-gsap-slider-list-status','grab');
      },
      onRelease() {
        setX(this.x);
        updateStatus(this.x);
        track.setAttribute('data-gsap-slider-list-status','grab');
      }
    })[0];

    // Initial state
    setX(0);
    updateStatus(0);
  });
}

// Debouncer: For resizing the window
function debounceOnWidthChange(fn, ms) {
  let last = innerWidth, timer;
  return function(...args) {
    clearTimeout(timer);
    timer = setTimeout(() => {
      if (innerWidth !== last) {
        last = innerWidth;
        fn.apply(this, args);
      }
    }, ms);
  };
}

window.addEventListener('resize', debounceOnWidthChange(initBasicGSAPSlider, 200));

// Initialize Basic GSAP Slider
document.addEventListener('DOMContentLoaded', function() {
  initBasicGSAPSlider();
});

Step 3: Add custom CSS

Step 2: Add custom CSS

CSS

Copy

[data-gsap-slider-init] {
  --slider-status: on; /* Turn slider on/off */
  --slider-spv: 3; /* Slides per view */ 
  --slider-gap: 1.5em; /* Slides Gap */
}

@media screen and (max-width: 991px) {
   [data-gsap-slider-init] {
    --slider-status: on; /* Turn slider on/off */
    --slider-spv: 2.25; /* Slides per view */ 
    --slider-gap: 1.5em; /* Slides Gap */
  } 
}

@media screen and (max-width: 767px) {
  [data-gsap-slider-init] { 
    --slider-status: on; /* Turn slider on/off */
    --slider-spv: 1.15; /* Slides per view */ 
    --slider-gap: 1em; /* Gap */
  }
}

[data-gsap-slider-item]:last-child {
  margin-right: 0;
}

/* Controls */
[data-gsap-slider-status="not-active"] [data-gsap-slider-controls] {
  display: none;
}

[data-gsap-slider-control-status="not-active"] { 
  opacity: 0.2;
  pointer-events: none;
}

/* Customization */

.gsap-slider__control {
  transition: opacity 0.3s ease;
}

.demo-card {
  transition: all 0.3s ease;
}

[data-gsap-slider-item-status="not-active"] .demo-card {
  background-color: #131313;
}

.demo-card__tag {
  transition: all 0.3s ease;
}

[data-gsap-slider-item-status="not-active"] .demo-card__tag {
  opacity: 0;
}

Implementation

Slider Group

Wrap your entire slider in a container bearing the [data-gsap-slider-init] attribute. On initialization, the script will toggle [data-gsap-slider-status="active"] (when sliding is enabled) or "not-active" (when disabled), so you can style or query its current state.

Slider Collection

Immediately inside the slider group, include an element with [data-gsap-slider-collection]. The script treats this as the viewport: it measures its width to determine how many slides are visible and locates the actual track within it.

Slider List

Within the collection, add the drag‐able track element marked with [data-gsap-slider-list]. This is the element that GSAP’s Draggable plugin transforms—everything you swipe or throw is applied to this list.

Slider Slides

Each slide item must carry [data-gsap-slider-item]. As you interact, the script will inject a [data-gsap-slider-item-status] attribute with one of:

active (the current slide)
inview (a partially visible slide)
not-active (completely off‐screen)

Previous/Next Buttons *optional

Previous Button: An element with [data-gsap-slider-control="prev"] lets users navigate to the previous slide. The script automatically disables this button when the first slide is active.
Next Button: An element with [data-gsap-slider-control="next"] lets users navigate to the next slide. This button is disabled when there are no more slides to show—especially considering the number of visible slides.
You can use the [data-gsap-slider-control-status="active/not-active"] attribute to style the disabled control.

Multiple Sliders

The script supports multiple independent slider instances on the same page: each [data-gsap-slider-init] container is initialized separately so its navigation controls and slide states stay isolated and never conflict with one another.

Accessibility

The slider enhances screen-reader and keyboard support by automatically injecting the appropriate aria roles, properties, and states at runtime.

Responsive Behavior (Watch CSS)

Set slides per view & gap

The number of slides visible at one time is controlled by the CSS custom property var(--slider-spv) on the slider. The gap can be set via var(--slider-gap) variable.

[data-gsap-slider-init] {
  --slider-status: on; /* Turn slider on/off */
  --slider-spv: 3; /* Slides per view */ 
  --slider-gap: 1.5em; /* Slides Gap */
}

Enable/Disable Slider with CSS

If you want to disable the slider on desktop, and enable on a mobile device you can use the --slider-status: on/off; CSS variable.

[data-gsap-slider-init] {
  --slider-status: off; /* Turn slider on/off */
}

@media screen and (max-width: 767px) {
  [data-gsap-slider-init] { 
    --slider-status: on; /* Turn slider on/off */
  }
}

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Resource details

Last updated
September 30, 2025
Category
Sliders & Marquees
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Slider

GSAP

Draggable

Inertia

Swipe

Slideshow

CSS

Card

Original source

Dennis Snellenberg

Basic GSAP Slider (Watch CSS)

Documentation

External Scripts in Webflow

Copy structure to Webflow

Custom Javascript in Webflow

Custom CSS in Webflow

Implementation

Slider Group

Slider Collection

Slider List

Slider Slides

Previous/Next Buttons *optional

Multiple Sliders

Accessibility

Responsive Behavior (Watch CSS)

Set slides per view & gap

Enable/Disable Slider with CSS

Flickity Slider Setup (Watch CSS)

Flickity Slider Setup (Watch CSS)

Centered Looping Slider

Creator Credits

Need help?

Join the Osmo Slack Community

Unlock the Osmo Vault

Upgrade toLifetime

Basic GSAP Slider (Watch CSS)

Documentation

External Scripts in Webflow

Copy structure to Webflow

Custom Javascript in Webflow

Custom CSS in Webflow

Implementation

Slider Group

Slider Collection

Slider List

Slider Slides

Previous/Next Buttons *optional

Multiple Sliders

Accessibility

Responsive Behavior (Watch CSS)

Set slides per view & gap

Enable/Disable Slider with CSS

Related resources

Flickity Slider Setup (Watch CSS)

Flickity Slider Setup (Watch CSS)

Centered Looping Slider

Creator Credits

Unlock the
Osmo Vault

Upgrade to
Lifetime