scroll-reveal-libraries

npm install aos@next
# or
yarn add aos@next

import AOS from 'aos';
import 'aos/dist/aos.css';
 
AOS.init();

<!-- Fade in -->
<div data-aos="fade-in">Content</div>
 
<!-- Fade up -->
<div data-aos="fade-up">Content</div>
 
<!-- Slide from right -->
<div data-aos="slide-left">Content</div>
 
<!-- Zoom in -->
<div data-aos="zoom-in">Content</div>

AOS.init({
  // Animation settings
  duration: 800,  // Animation duration (ms): 0-3000
  delay: 0,       // Delay before animation (ms): 0-3000
  offset: 120,    // Offset from trigger point (px)
  easing: 'ease', // Easing function
  once: false,    // Animate only once (true) or every time (false)
  mirror: false,  // Animate out when scrolling past
 
  // Placement
  anchorPlacement: 'top-bottom', // Which position triggers animation
 
  // Performance
  disable: false,                // Disable on mobile/tablet
  startEvent: 'DOMContentLoaded', // Initialization event
  debounceDelay: 50,             // Window resize debounce
  throttleDelay: 99              // Scroll throttle
});

<div
  data-aos="fade-up"
  data-aos-duration="1000"
  data-aos-delay="200"
  data-aos-offset="50"
  data-aos-easing="ease-in-out"
  data-aos-once="true"
  data-aos-mirror="true"
  data-aos-anchor-placement="center-bottom"
>
  Custom configured element
</div>

<section class="hero">
  <!-- Staggered heading words -->
  <h1
    data-aos="fade-down"
    data-aos-duration="800"
  >
    Welcome to the Future
  </h1>
 
  <!-- Delayed subheading -->
  <p
    data-aos="fade-up"
    data-aos-delay="200"
    data-aos-duration="600"
  >
    Transform your ideas into reality
  </p>
 
  <!-- CTA button -->
  <button
    data-aos="zoom-in"
    data-aos-delay="400"
    data-aos-duration="500"
  >
    Get Started
  </button>
</section>

<div class="features-grid">
  <!-- Stagger cards with increasing delays -->
  <div
    class="feature-card"
    data-aos="fade-up"
    data-aos-duration="600"
    data-aos-delay="0"
  >
    <h3>Feature 1</h3>
    <p>Description...</p>
  </div>
 
  <div
    class="feature-card"
    data-aos="fade-up"
    data-aos-duration="600"
    data-aos-delay="100"
  >
    <h3>Feature 2</h3>
    <p>Description...</p>
  </div>
 
  <div
    class="feature-card"
    data-aos="fade-up"
    data-aos-duration="600"
    data-aos-delay="200"
  >
    <h3>Feature 3</h3>
    <p>Description...</p>
  </div>
</div>

<!-- Content from left -->
<div class="section">
  <div
    class="content"
    data-aos="slide-right"
    data-aos-duration="800"
  >
    <h2>Section Title</h2>
    <p>Content slides in from left...</p>
  </div>
  <img
    src="image1.jpg"
    data-aos="fade-left"
    data-aos-delay="200"
  />
</div>
 
<!-- Content from right -->
<div class="section reverse">
  <img
    src="image2.jpg"
    data-aos="fade-right"
  />
  <div
    class="content"
    data-aos="slide-left"
    data-aos-duration="800"
    data-aos-delay="200"
  >
    <h2>Section Title</h2>
    <p>Content slides in from right...</p>
  </div>
</div>

<div class="testimonials">
  <div
    class="testimonial"
    data-aos="zoom-in"
    data-aos-duration="500"
  >
    <blockquote>"Amazing product!"</blockquote>
    <cite>- John Doe</cite>
  </div>
 
  <div
    class="testimonial"
    data-aos="zoom-in"
    data-aos-duration="500"
    data-aos-delay="100"
  >
    <blockquote>"Exceeded expectations"</blockquote>
    <cite>- Jane Smith</cite>
  </div>
</div>

<!-- Fixed sidebar animates based on main content scroll -->
<div class="main-content">
  <div id="trigger-point" data-aos-id="sidebar-trigger">
    <!-- Content -->
  </div>
</div>
 
<aside
  class="sidebar"
  data-aos="fade-left"
  data-aos-anchor="#trigger-point"
>
  Sidebar content
</aside>

<div class="animation-sequence">
  <!-- Step 1: Heading -->
  <h2
    data-aos="fade-down"
    data-aos-duration="600"
    data-aos-delay="0"
  >
    Our Process
  </h2>
 
  <!-- Step 2: Description -->
  <p
    data-aos="fade-up"
    data-aos-duration="600"
    data-aos-delay="200"
  >
    Follow these simple steps
  </p>
 
  <!-- Step 3-5: Process cards -->
  <div
    class="process-step"
    data-aos="flip-left"
    data-aos-delay="400"
  >
    Step 1
  </div>
 
  <div
    class="process-step"
    data-aos="flip-left"
    data-aos-delay="600"
  >
    Step 2
  </div>
 
  <div
    class="process-step"
    data-aos="flip-left"
    data-aos-delay="800"
  >
    Step 3
  </div>
</div>

<div class="gallery">
  <img
    src="photo1.jpg"
    data-aos="zoom-in-up"
    data-aos-duration="800"
  />
  <img
    src="photo2.jpg"
    data-aos="zoom-in-up"
    data-aos-duration="800"
    data-aos-delay="100"
  />
  <img
    src="photo3.jpg"
    data-aos="zoom-in-up"
    data-aos-duration="800"
    data-aos-delay="200"
  />
</div>

import { useEffect } from 'react';
import AOS from 'aos';
import 'aos/dist/aos.css';
 
function App() {
  useEffect(() => {
    AOS.init({
      duration: 800,
      once: true,
      offset: 100
    });
  }, []);
 
  return (
    <div>
      <h1 data-aos="fade-down">Welcome</h1>
      <p data-aos="fade-up">Content here</p>
    </div>
  );
}

import { useEffect } from 'react';
import { useLocation } from 'react-router-dom';
import AOS from 'aos';
 
function App() {
  const location = useLocation();
 
  useEffect(() => {
    AOS.init({ duration: 800 });
  }, []);
 
  // Refresh AOS on route change
  useEffect(() => {
    AOS.refresh();
  }, [location]);
 
  return <Routes>{/* routes */}</Routes>;
}

import { useState, useEffect } from 'react';
import AOS from 'aos';
 
function DynamicList() {
  const [items, setItems] = useState([]);
 
  useEffect(() => {
    AOS.init();
  }, []);
 
  const addItem = () => {
    setItems([...items, { id: Date.now(), text: 'New Item' }]);
 
    // Refresh AOS to detect new elements
    setTimeout(() => AOS.refresh(), 50);
  };
 
  return (
    <div>
      <button onClick={addItem}>Add Item</button>
      <ul>
        {items.map((item) => (
          <li key={item.id} data-aos="fade-in">
            {item.text}
          </li>
        ))}
      </ul>
    </div>
  );
}

import AOS from 'aos';
import 'aos/dist/aos.css';
 
function AnimatedSection({ children, animation = "fade-up", delay = 0, ...props }) {
  return (
    <div
      data-aos={animation}
      data-aos-delay={delay}
      {...props}
    >
      {children}
    </div>
  );
}
 
// Usage
<AnimatedSection animation="slide-right" delay={200}>
  <h2>Animated Content</h2>
</AnimatedSection>

<template>
  <div>
    <h1 data-aos="fade-down">Vue + AOS</h1>
    <div
      v-for="(item, index) in items"
      :key="item.id"
      data-aos="fade-up"
      :data-aos-delay="index * 100"
    >
      {{ item.text }}
    </div>
  </div>
</template>
 
<script>
import AOS from 'aos';
import 'aos/dist/aos.css';
 
export default {
  mounted() {
    AOS.init({ duration: 800 });
  },
  updated() {
    // Refresh when component updates
    this.$nextTick(() => {
      AOS.refresh();
    });
  },
  data() {
    return {
      items: [/*...*/]
    };
  }
};
</script>

// pages/_app.js
import { useEffect } from 'react';
import AOS from 'aos';
import 'aos/dist/aos.css';
 
function MyApp({ Component, pageProps }) {
  useEffect(() => {
    AOS.init({
      duration: 800,
      once: true
    });
  }, []);
 
  return <Component {...pageProps} />;
}
 
export default MyApp;

// pages/index.js
export default function Home() {
  return (
    <main>
      <h1 data-aos="fade-down">Next.js + AOS</h1>
      <p data-aos="fade-up">Server-side rendered content with animations</p>
    </main>
  );
}

AOS.init({
  disable: 'mobile', // Disable on mobile
  // Or use function for custom logic
  disable: function() {
    return window.innerWidth < 768;
  }
});

AOS.init({
  once: true, // Animate only once (better performance)
  mirror: false // Don't animate out
});

AOS.init({
  throttleDelay: 99,  // Scroll event throttle (default)
  debounceDelay: 50   // Resize event debounce (default)
});

AOS.init({
  disableMutationObserver: true // Disable for fully static content
});

<!-- Simpler animations perform better -->
<div data-aos="fade-in">Simple fade</div>
 
<!-- Complex animations may cause jank -->
<div data-aos="flip-left">Complex flip</div>

if ('requestIdleCallback' in window) {
  requestIdleCallback(() => {
    AOS.init({ duration: 800 });
  });
} else {
  AOS.init({ duration: 800 });
}

// After adding elements to DOM
const newElement = document.createElement('div');
newElement.setAttribute('data-aos', 'fade-in');
container.appendChild(newElement);
 
// Refresh AOS
AOS.refresh(); // Recalculate positions
// or
AOS.refreshHard(); // Reinitialize completely

useEffect(() => {
  AOS.init();
  return () => AOS.refresh(); // Cleanup
}, []);
 
useEffect(() => {
  AOS.refresh(); // Refresh on route change
}, [location.pathname]);

AOS.init({
  once: true, // Animate only once
  disable: window.innerWidth < 768 // Disable on mobile
});

/* Bad: Conflicts with AOS */
div {
  opacity: 1 !important;
}
 
/* Good: Specific selector */
.my-content > div {
  /* styles */
}

// Triggers when element's top hits viewport bottom
data-aos-anchor-placement="top-bottom"
 
// Triggers when element's center hits viewport center
data-aos-anchor-placement="center-center"
 
// Triggers when element's bottom hits viewport top
data-aos-anchor-placement="bottom-top"

body[data-aos-duration='4000'] [data-aos],
[data-aos][data-aos][data-aos-duration='4000'] {
  transition-duration: 4000ms;
}

<div data-aos="fade-in" data-aos-duration="4000">
  Long animation
</div>

[data-aos="custom-slide-bounce"] {
  opacity: 0;
  transform: translateY(100px);
  transition-property: transform, opacity;
}
 
[data-aos="custom-slide-bounce"].aos-animate {
  opacity: 1;
  transform: translateY(0);
  animation: bounce 0.5s;
}
 
@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-10px);
  }
  60% {
    transform: translateY(-5px);
  }
}

<div data-aos="custom-slide-bounce">
  Custom animation
</div>