Fix Javascript

static/js/core.js

@@ -0,0 +1,53 @@
+// Navbar color change on scroll
+        window.addEventListener('scroll', function() {
+            const navbar = document.getElementById('navbar');
+            if (window.scrollY > 50) {
+                navbar.classList.add('scrolled');
+            } else {
+                navbar.classList.remove('scrolled');
+            }
+        });
+
+        // Back to top button
+        const backToTopButton = document.getElementById('back-to-top');
+
+        window.addEventListener('scroll', function() {
+            if (window.scrollY > 300) {
+                backToTopButton.style.display = 'block';
+            } else {
+                backToTopButton.style.display = 'none';
+            }
+        });
+
+        backToTopButton.addEventListener('click', function() {
+            window.scrollTo({
+                top: 0,
+                behavior: 'smooth'
+            });
+        });
+
+        // Activate animation when elements come into view
+        const animateOnScroll = function() {
+            const elements = document.querySelectorAll('.animate__animated');
+
+            elements.forEach(function(element) {
+                const position = element.getBoundingClientRect();
+
+                // If the element is in the viewport
+                if(position.top < window.innerHeight && position.bottom >= 0) {
+                    // Get the animation class
+                    const animationClass = Array.from(element.classList).find(className =>
+                        className.startsWith('animate__') && className !== 'animate__animated'
+                    );
+
+                    // If it has 'animate__fadeIn' class and is not already visible
+                    if(animationClass && !element.classList.contains('animated-in')) {
+                        element.classList.add('animated-in');
+                    }
+                }
+            });
+        };
+
+        window.addEventListener('scroll', animateOnScroll);
+        // Trigger on page load
+        window.addEventListener('load', animateOnScroll);