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frontblocks-animations.js
96 lines
| 1 | window.addEventListener('load', (event) => { |
| 2 | /** |
| 3 | * onIntersection will be triggered each time an observed item is visible in the viewport. |
| 4 | * |
| 5 | * @param {elements} The list of queried elements |
| 6 | * @param {*} Defines the option parameters for the observer API |
| 7 | */ |
| 8 | const onIntersection = (elements, options) => { |
| 9 | elements.forEach((element) => { |
| 10 | // Check for both old and new animation attribute formats |
| 11 | let animationData = element.target.dataset.frontblocks_animation; |
| 12 | const hasModernFormat = element.target.classList.contains('animate__animated'); |
| 13 | |
| 14 | if (animationData) { |
| 15 | // Handle legacy format |
| 16 | // Check if the data attribute doesn't include the prefix, and add it otherwise. |
| 17 | if (!animationData.includes('animate__')) { |
| 18 | animationData = 'animate__'.concat(animationData); |
| 19 | } |
| 20 | |
| 21 | // Add the CSS class if the element is visible. |
| 22 | if (element.isIntersecting) { |
| 23 | element.target.classList.add('animate__animated', animationData); |
| 24 | } |
| 25 | } else if (hasModernFormat && element.isIntersecting) { |
| 26 | // For modern format (added by block attributes) |
| 27 | // The classes are already there from the block rendering |
| 28 | // Just trigger animation by ensuring animation-play-state is running |
| 29 | element.target.style.visibility = 'visible'; |
| 30 | element.target.style.animationPlayState = 'running'; |
| 31 | |
| 32 | // If this element should repeat, set up the animation to repeat |
| 33 | // Check multiple possible sources for repeat value |
| 34 | const repeatValue = element.target.style.getPropertyValue('--animate-repeat') || |
| 35 | element.target.dataset.animateRepeat || |
| 36 | element.target.getAttribute('data-animate-repeat'); |
| 37 | |
| 38 | if (repeatValue === 'infinite') { |
| 39 | // For infinite animations, set the iteration count to infinite |
| 40 | element.target.style.animationIterationCount = 'infinite'; |
| 41 | } else if (repeatValue && repeatValue !== '1') { |
| 42 | // For numbered repeats, we handle it |
| 43 | const repeat = parseInt(repeatValue); |
| 44 | if (!isNaN(repeat) && repeat > 1) { |
| 45 | // Only add the event listener if it hasn't been added before |
| 46 | if (!element.target.dataset.repeatListenerAdded) { |
| 47 | element.target.dataset.repeatListenerAdded = 'true'; |
| 48 | element.target.dataset.currentRepeat = '0'; |
| 49 | |
| 50 | element.target.addEventListener('animationend', () => { |
| 51 | let currentRepeat = parseInt(element.target.dataset.currentRepeat || 0); |
| 52 | if (currentRepeat < repeat - 1) { |
| 53 | element.target.dataset.currentRepeat = currentRepeat + 1; |
| 54 | // Trigger animation again by restarting it |
| 55 | element.target.style.animation = 'none'; |
| 56 | setTimeout(() => { |
| 57 | element.target.style.animation = ''; |
| 58 | element.target.style.animationPlayState = 'running'; |
| 59 | }, 10); |
| 60 | } |
| 61 | }); |
| 62 | } |
| 63 | } |
| 64 | } |
| 65 | } |
| 66 | }); |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * Declares an instance of the IntersectionObserver API, which receives a function that will execute each time an observed |
| 71 | * item is present in the viewport. |
| 72 | */ |
| 73 | const observer = new IntersectionObserver(onIntersection, { |
| 74 | root: null, |
| 75 | threshold: 0.2, // Lower threshold to start animation sooner |
| 76 | rootMargin: '0px 0px -10% 0px' // Trigger slightly before element is fully in view |
| 77 | }); |
| 78 | |
| 79 | /** |
| 80 | * Gather a list of all the DOM elements which contain animations. |
| 81 | * This includes both legacy data-attribute animations and new class-based animations. |
| 82 | * Then, observe the presence of each one in the viewport. |
| 83 | */ |
| 84 | const animatedElements = document.querySelectorAll('[data-frontblocks_animation], .animate__animated'); |
| 85 | |
| 86 | // For modern animated elements, initially hide them until they're in view |
| 87 | document.querySelectorAll('.animate__animated:not([data-frontblocks_animation])').forEach(el => { |
| 88 | el.style.visibility = 'hidden'; |
| 89 | el.style.animationPlayState = 'paused'; |
| 90 | }); |
| 91 | |
| 92 | // Observe all animated elements |
| 93 | animatedElements.forEach((element) => { |
| 94 | observer.observe(element); |
| 95 | }); |
| 96 | }); |