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(function () { |
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'use strict'; |
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|
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document.addEventListener('DOMContentLoaded', function () { |
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initServiceCards(); |
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}); |
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|
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function initServiceCards() { |
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if (!('IntersectionObserver' in window)) return; |
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|
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document.querySelectorAll('.bkbg-sk-wrapper').forEach(function (wrapper) { |
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/* Responsive column CSS vars from data attributes */ |
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var colsTablet = wrapper.dataset.colsTablet; |
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var colsMobile = wrapper.dataset.colsMobile; |
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|
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if (colsTablet) wrapper.style.setProperty('--bkbg-sk-cols-tablet', colsTablet); |
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if (colsMobile) wrapper.style.setProperty('--bkbg-sk-cols-mobile', colsMobile); |
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|
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/* Staggered card entrance animation */ |
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var cards = Array.from(wrapper.querySelectorAll('.bkbg-sk-card')); |
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if (!cards.length) return; |
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|
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/* Hide cards initially */ |
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cards.forEach(function (card) { |
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card.classList.add('bkbg-sk--hidden'); |
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card.style.opacity = '0'; |
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card.style.transform = 'translateY(20px)'; |
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}); |
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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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var card = entry.target; |
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var idx = cards.indexOf(card); |
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var delay = idx * 80; /* ms stagger */ |
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|
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setTimeout(function () { |
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card.style.opacity = ''; |
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card.style.transform = ''; |
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card.style.transition = 'opacity 0.45s ease, transform 0.45s ease'; |
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card.classList.remove('bkbg-sk--hidden'); |
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card.classList.add('bkbg-sk--visible'); |
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}, delay); |
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|
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observer.unobserve(card); |
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} |
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}); |
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}, { threshold: 0.12 }); |
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|
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cards.forEach(function (card) { |
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observer.observe(card); |
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}); |
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}); |
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} |
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})(); |
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|
