Javascript Smooth Scroll to Element

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<nav class="navbar">
  <div class="nav-content">
    <div class="logo">
      <ion-icon name="rocket-outline"></ion-icon>
      Smooth Scroll
    </div>
    <div class="nav-links">
      <button class="nav-btn" data-scroll="home">
        <ion-icon name="home-outline"></ion-icon>
        Home
      </button>
      <button class="nav-btn" data-scroll="features">
        <ion-icon name="sparkles-outline"></ion-icon>
        Features
      </button>
      <button class="nav-btn" data-scroll="methods">
        <ion-icon name="code-slash-outline"></ion-icon>
        Methods
      </button>
      <button class="nav-btn" data-scroll="examples">
        <ion-icon name="bulb-outline"></ion-icon>
        Examples
      </button>
      <button class="nav-btn" data-scroll="contact">
        <ion-icon name="mail-outline"></ion-icon>
        Contact
      </button>
    </div>
  </div>
</nav>

<div class="content">
  <section class="hero" id="home">
    <h1>Smooth Scroll to Element</h1>
    <p>Learn how to implement smooth scrolling to specific elements on your webpage using JavaScript. Click the navigation buttons above to see smooth scrolling in action!</p>
  </section>

  <section class="section" id="features">
    <h2>
      <ion-icon name="star-outline"></ion-icon>
      Key Features
    </h2>
    <p>Smooth scrolling enhances user experience by providing seamless navigation between different sections of your webpage. Here are the main benefits:</p>

    <div class="feature-grid">
      <div class="feature-card">
        <ion-icon name="flash-outline"></ion-icon>
        <h3>Instant Navigation</h3>
        <p>Jump to any section instantly with smooth animation</p>
      </div>
      <div class="feature-card">
        <ion-icon name="eye-outline"></ion-icon>
        <h3>Visual Appeal</h3>
        <p>Creates a modern, polished user experience</p>
      </div>
      <div class="feature-card">
        <ion-icon name="layers-outline"></ion-icon>
        <h3>Easy Integration</h3>
        <p>Simple to implement with vanilla JavaScript</p>
      </div>
      <div class="feature-card">
        <ion-icon name="construct-outline"></ion-icon>
        <h3>Customizable</h3>
        <p>Full control over scroll behavior and timing</p>
      </div>
    </div>

    <div class="demo-buttons">
      <button class="demo-btn" data-scroll="methods">
        <ion-icon name="arrow-down-outline"></ion-icon>
        Scroll to Methods
      </button>
      <button class="demo-btn" data-scroll="examples">
        <ion-icon name="arrow-down-outline"></ion-icon>
        Scroll to Examples
      </button>
    </div>
  </section>

  <section class="section" id="methods">
    <h2>
      <ion-icon name="code-working-outline"></ion-icon>
      Implementation Methods
    </h2>
    <p>There are several ways to implement smooth scrolling to elements. Here are the most common approaches:</p>

    <div class="info-box">
      <h3>
        <ion-icon name="information-circle-outline"></ion-icon>
        Method 1: CSS Only
      </h3>
      <div class="code-block">
        <span class="keyword">html</span> {
        scroll-behavior: <span class="string">smooth</span>;
        }
      </div>
      <p>The simplest method - just add this to your CSS and all anchor links will scroll smoothly.</p>
    </div>

    <div class="info-box">
      <h3>
        <ion-icon name="information-circle-outline"></ion-icon>
        Method 2: scrollIntoView()
      </h3>
      <div class="code-block">
        <span class="comment">// Scroll to element smoothly</span>
        <span class="keyword">const</span> element = document.<span class="function">getElementById</span>(<span class="string">'section-id'</span>);
        element.<span class="function">scrollIntoView</span>({
        behavior: <span class="string">'smooth'</span>,
        block: <span class="string">'start'</span>
        });
      </div>
      <p>Native JavaScript method with good browser support and customization options.</p>
    </div>

    <div class="info-box">
      <h3>
        <ion-icon name="information-circle-outline"></ion-icon>
        Method 3: Custom Animation
      </h3>
      <div class="code-block">
        <span class="keyword">function</span> <span class="function">smoothScrollTo</span>(element) {
        <span class="keyword">const</span> targetPosition = element.<span class="function">getBoundingClientRect</span>().top;
        <span class="keyword">const</span> startPosition = window.pageYOffset;
        <span class="keyword">const</span> distance = targetPosition;
        <span class="keyword">const</span> duration = <span class="string">1000</span>;
        <span class="keyword">let</span> start = <span class="keyword">null</span>;

        <span class="keyword">function</span> <span class="function">animation</span>(currentTime) {
        <span class="keyword">if</span> (start === <span class="keyword">null</span>) start = currentTime;
        <span class="keyword">const</span> timeElapsed = currentTime - start;
        <span class="keyword">const</span> run = <span class="function">ease</span>(timeElapsed, startPosition, distance, duration);
        window.<span class="function">scrollTo</span>(<span class="string">0</span>, run);
        <span class="keyword">if</span> (timeElapsed < duration) <span class="function">requestAnimationFrame</span>(animation);
      }

      <span class="keyword">function</span> <span class="function">ease</span>(t, b, c, d) {
      t /= d / <span class="string">2</span>;
      <span class="keyword">if</span> (t < <span class="string">1</span>) <span class="keyword">return</span> c / <span class="string">2</span> * t * t + b;
    t--;
    <span class="keyword">return</span> -c / <span class="string">2</span> * (t * (t - <span class="string">2</span>) - <span class="string">1</span>) + b;
    }

    <span class="function">requestAnimationFrame</span>(animation);
    }
    </div>
  <p>Full control with custom easing functions and animation timing.</p>
</div>
</section>

<section class="section" id="examples">
  <h2>
    <ion-icon name="create-outline"></ion-icon>
    Practical Examples
  </h2>
  <p>Here are some real-world use cases for smooth scrolling:</p>

  <div class="highlight-box">
    <h3>📱 Single Page Applications</h3>
    <p>Perfect for one-page websites with multiple sections like portfolios, landing pages, and product showcases. Users can navigate seamlessly between different sections without page reloads.</p>
  </div>

  <div class="highlight-box">
    <h3>📚 Documentation Sites</h3>
    <p>Great for technical documentation and knowledge bases where users need to jump between different topics. Smooth scrolling makes navigation feel natural and intuitive.</p>
  </div>

  <div class="highlight-box">
    <h3>🛒 E-commerce Sites</h3>
    <p>Useful for product pages with multiple sections like reviews, specifications, and related products. Smooth scrolling enhances the shopping experience.</p>
  </div>

  <div class="info-box">
    <h3>
      <ion-icon name="checkmark-circle-outline"></ion-icon>
      Best Practices
    </h3>
    <ul>
      <li>Use <code>scroll-margin-top</code> to account for fixed headers</li>
      <li>Keep animation duration between 500-1000ms for optimal UX</li>
      <li>Test on mobile devices - touch scrolling behaves differently</li>
      <li>Provide fallbacks for older browsers</li>
      <li>Consider accessibility - some users prefer reduced motion</li>
      <li>Ensure keyboard navigation still works properly</li>
    </ul>
  </div>

  <div class="demo-buttons">
    <button class="demo-btn" data-scroll="home">
      <ion-icon name="arrow-up-outline"></ion-icon>
      Back to Top
    </button>
    <button class="demo-btn" data-scroll="contact">
      <ion-icon name="arrow-down-outline"></ion-icon>
      Go to Contact
    </button>
  </div>
</section>

<section class="section" id="contact">
  <h2>
    <ion-icon name="chatbubbles-outline"></ion-icon>
    Contact Section
  </h2>
  <p>This is the final section of the page. You've successfully scrolled through all sections using smooth scrolling!</p>
  <p>Notice how the navigation buttons in the header and throughout the page all use smooth scrolling to navigate between sections. The scroll animation provides a much better user experience compared to instant jumping.</p>

  <div class="info-box">
    <h3>
      <ion-icon name="globe-outline"></ion-icon>
      Browser Support
    </h3>
    <ul>
      <li><strong>CSS scroll-behavior:</strong> Supported in Chrome, Firefox, Edge (90%+ coverage)</li>
      <li><strong>scrollIntoView():</strong> Excellent support across all modern browsers</li>
      <li><strong>Custom animations:</strong> Universal support with requestAnimationFrame</li>
    </ul>
  </div>

  <div class="demo-buttons">
    <button class="demo-btn" data-scroll="home">
      <ion-icon name="home-outline"></ion-icon>
      Return Home
    </button>
  </div>
</section>

<footer>
  <p style="font-size: 18px; font-weight: 600; color: #ff6b35; margin-bottom: 10px;">
    Smooth Scroll Demo
  </p>
  <p>Built with HTML, CSS & JavaScript • Try clicking any navigation button!</p>
</footer>
</div>

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: auto;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            background: linear-gradient(to bottom, #ff6b35 0%, #f7931e 50%, #ff8c42 100%);
            color: #333;
        }

        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(10px);
            padding: 20px 40px;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
            z-index: 1000;
        }

        .nav-content {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .logo {
            font-size: 24px;
            font-weight: 700;
            color: #ff6b35;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .nav-links {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
        }

        .nav-btn {
            background: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
            color: white;
            border: none;
            border-radius: 8px;
            padding: 10px 20px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .nav-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
        }

        .content {
            padding-top: 100px;
            max-width: 1000px;
            margin: 0 auto;
            padding-left: 40px;
            padding-right: 40px;
        }

        .hero {
            background: white;
            border-radius: 20px;
            padding: 60px 40px;
            text-align: center;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
            margin-bottom: 40px;
        }

        .hero h1 {
            font-size: 48px;
            color: #ff6b35;
            margin-bottom: 20px;
        }

        .hero p {
            font-size: 18px;
            color: #666;
            line-height: 1.6;
        }

        .section {
            background: white;
            border-radius: 16px;
            padding: 50px 40px;
            margin-bottom: 40px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
            scroll-margin-top: 100px;
        }

        .section h2 {
            font-size: 32px;
            color: #ff6b35;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .section h2 ion-icon {
            font-size: 36px;
        }

        .section p {
            font-size: 16px;
            color: #555;
            line-height: 1.8;
            margin-bottom: 15px;
        }

        .code-block {
            background: #2d2d2d;
            color: #f8f8f2;
            padding: 25px;
            border-radius: 12px;
            font-family: 'Courier New', monospace;
            font-size: 14px;
            overflow-x: auto;
            margin: 25px 0;
            line-height: 1.8;
        }

        .code-block .keyword {
            color: #ff79c6;
        }

        .code-block .string {
            color: #f1fa8c;
        }

        .code-block .comment {
            color: #6272a4;
        }

        .code-block .function {
            color: #50fa7b;
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }

        .feature-card {
            background: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
            color: white;
            padding: 30px;
            border-radius: 12px;
            text-align: center;
            transition: transform 0.3s ease;
        }

        .feature-card:hover {
            transform: translateY(-5px);
        }

        .feature-card ion-icon {
            font-size: 48px;
            margin-bottom: 15px;
        }

        .feature-card h3 {
            font-size: 20px;
            margin-bottom: 10px;
        }

        .feature-card p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.9);
        }

        .info-box {
            background: #fff4ed;
            border-left: 4px solid #ff6b35;
            padding: 20px;
            border-radius: 8px;
            margin: 25px 0;
        }

        .info-box h3 {
            color: #ff6b35;
            margin-bottom: 12px;
            font-size: 18px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .info-box ul {
            margin-left: 20px;
            color: #555;
            line-height: 1.8;
        }

        .info-box li {
            margin: 8px 0;
        }

        .demo-buttons {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
            margin: 25px 0;
        }

        .demo-btn {
            background: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
            color: white;
            border: none;
            border-radius: 10px;
            padding: 12px 24px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .demo-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(255, 107, 53, 0.4);
        }

        .demo-btn:active {
            transform: translateY(0);
        }

        footer {
            background: white;
            padding: 40px;
            text-align: center;
            color: #666;
            margin-top: 40px;
            border-radius: 16px 16px 0 0;
        }

        .highlight-box {
            background: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
            color: white;
            padding: 30px;
            border-radius: 12px;
            margin: 25px 0;
        }

        .highlight-box h3 {
            font-size: 22px;
            margin-bottom: 15px;
        }

        @media (max-width: 768px) {
            .navbar {
                padding: 15px 20px;
            }

            .content {
                padding-left: 20px;
                padding-right: 20px;
            }

            .hero h1 {
                font-size: 32px;
            }

            .section {
                padding: 30px 20px;
            }

            .nav-links {
                width: 100%;
            }

            .nav-btn {
                flex: 1;
                justify-content: center;
            }
        }

     // Get all navigation buttons
        const navButtons = document.querySelectorAll('[data-scroll]');

        // Add click event to each button
        navButtons.forEach(button => {
            button.addEventListener('click', () => {
                const targetId = button.getAttribute('data-scroll');
                const targetElement = document.getElementById(targetId);
                
                if (targetElement) {
                    // Use custom smooth scroll for consistent animation
                    smoothScrollTo(targetElement);
                }
            });
        });

        // Custom smooth scroll function (alternative approach)
        function smoothScrollTo(element) {
            const targetPosition = element.getBoundingClientRect().top + window.pageYOffset - 90;
            const startPosition = window.pageYOffset;
            const distance = targetPosition - startPosition;
            const duration = 1000;
            let start = null;

            function animation(currentTime) {
                if (start === null) start = currentTime;
                const timeElapsed = currentTime - start;
                const progress = Math.min(timeElapsed / duration, 1);
                
                // Easing function (easeInOutCubic for smoother animation)
                const easeProgress = progress < 0.5
                    ? 4 * progress * progress * progress
                    : 1 - Math.pow(-2 * progress + 2, 3) / 2;
                
                window.scrollTo(0, startPosition + distance * easeProgress);
                
                if (progress < 1) {
                    requestAnimationFrame(animation);
                }
            }

            requestAnimationFrame(animation);
        }

        // Optional: Highlight active section on scroll
        window.addEventListener('scroll', () => {
            const sections = document.querySelectorAll('.section, .hero');
            const scrollPosition = window.pageYOffset + 150;

            sections.forEach(section => {
                const sectionTop = section.offsetTop;
                const sectionHeight = section.offsetHeight;
                const sectionId = section.getAttribute('id');

                if (scrollPosition >= sectionTop && scrollPosition < sectionTop + sectionHeight) {
                    // Remove active class from all buttons
                    navButtons.forEach(btn => {
                        if (btn.getAttribute('data-scroll') === sectionId) {
                            btn.style.opacity = '1';
                        } else {
                            btn.style.opacity = '0.7';
                        }
                    });
                }
            });
        });