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/** |
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* Timeline Block Frontend |
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* Handles scroll animations |
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*/ |
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(function() { |
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'use strict'; |
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|
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function initTimeline() { |
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var timelines = document.querySelectorAll('.bkbg-tl-wrap[data-animate="1"]'); |
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|
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if (!timelines.length) return; |
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|
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// Check if IntersectionObserver is supported |
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if (!('IntersectionObserver' in window)) { |
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// Fallback: show all items immediately |
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timelines.forEach(function(timeline) { |
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var items = timeline.querySelectorAll('.bkbg-tl-item'); |
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items.forEach(function(item) { |
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item.classList.add('is-visible'); |
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}); |
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}); |
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return; |
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} |
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|
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timelines.forEach(function(timeline) { |
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var items = timeline.querySelectorAll('.bkbg-tl-item'); |
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|
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var observer = new IntersectionObserver(function(entries) { |
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entries.forEach(function(entry) { |
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if (entry.isIntersecting) { |
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// Add staggered delay based on item index |
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var item = entry.target; |
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var index = Array.from(items).indexOf(item); |
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|
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setTimeout(function() { |
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item.classList.add('is-visible'); |
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}, index * 150); |
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|
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// Stop observing once visible |
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observer.unobserve(item); |
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} |
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}); |
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}, { |
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threshold: 0.2, |
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rootMargin: '0px 0px -50px 0px' |
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}); |
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|
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items.forEach(function(item) { |
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observer.observe(item); |
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}); |
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}); |
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} |
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|
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// Initialize on DOM ready |
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if (document.readyState === 'loading') { |
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document.addEventListener('DOMContentLoaded', initTimeline); |
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} else { |
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initTimeline(); |
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} |
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})(); |
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|
