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(function () { |
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'use strict'; |
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|
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function initSlider(wrapper) { |
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var slider = wrapper.querySelector('.bkbg-is-slider'); |
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if (!slider) return; |
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|
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var slides = Array.prototype.slice.call(wrapper.querySelectorAll('.bkbg-is-slide')); |
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var dots = Array.prototype.slice.call(wrapper.querySelectorAll('.bkbg-is-dot')); |
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var prevBtn = wrapper.querySelector('.bkbg-is-arrow-prev'); |
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var nextBtn = wrapper.querySelector('.bkbg-is-arrow-next'); |
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var total = slides.length; |
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if (total < 2) return; |
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|
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var current = 0; |
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var autoplay = wrapper.dataset.autoplay === '1'; |
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var speed = parseInt(wrapper.dataset.speed, 10) || 4000; |
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var loop = wrapper.dataset.loop === '1'; |
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var pauseHover = wrapper.dataset.pauseHover === '1'; |
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var transition = wrapper.dataset.transition || 'slide'; |
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var timer = null; |
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var touching = false; |
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var touchStartX = 0; |
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|
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function goTo(n) { |
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if (!loop && (n < 0 || n >= total)) return; |
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var prev = current; |
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current = (n + total) % total; |
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if (prev === current) return; |
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|
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slides[prev].classList.remove('bkbg-is-slide-active'); |
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if (transition === 'slide') slides[prev].classList.add('bkbg-is-slide-exit'); |
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|
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slides[current].classList.add('bkbg-is-slide-active'); |
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if (dots[prev]) dots[prev].classList.remove('bkbg-is-dot-active'); |
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if (dots[current]) dots[current].classList.add('bkbg-is-dot-active'); |
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|
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if (transition === 'slide') { |
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var exPrev = prev; |
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setTimeout(function () { slides[exPrev].classList.remove('bkbg-is-slide-exit'); }, 600); |
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} |
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} |
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|
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function next() { goTo(current + 1); } |
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function prev() { goTo(current - 1); } |
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|
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function startTimer() { |
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if (!autoplay) return; |
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timer = setInterval(next, speed); |
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} |
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|
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function stopTimer() { clearInterval(timer); timer = null; } |
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|
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if (nextBtn) nextBtn.addEventListener('click', function () { stopTimer(); next(); startTimer(); }); |
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if (prevBtn) prevBtn.addEventListener('click', function () { stopTimer(); prev(); startTimer(); }); |
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|
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dots.forEach(function (dot, idx) { |
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dot.addEventListener('click', function () { stopTimer(); goTo(idx); startTimer(); }); |
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}); |
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|
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if (pauseHover) { |
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wrapper.addEventListener('mouseenter', stopTimer); |
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wrapper.addEventListener('mouseleave', function () { if (autoplay) startTimer(); }); |
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} |
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|
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/* Touch/swipe */ |
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wrapper.addEventListener('touchstart', function (e) { |
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touching = true; |
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touchStartX = e.touches[0].clientX; |
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}, { passive: true }); |
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|
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wrapper.addEventListener('touchend', function (e) { |
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if (!touching) return; |
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touching = false; |
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var delta = touchStartX - e.changedTouches[0].clientX; |
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if (Math.abs(delta) > 40) { |
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stopTimer(); |
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delta > 0 ? next() : prev(); |
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startTimer(); |
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} |
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}); |
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|
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/* Keyboard support */ |
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wrapper.setAttribute('tabindex', '0'); |
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wrapper.addEventListener('keydown', function (e) { |
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if (e.key === 'ArrowLeft') { stopTimer(); prev(); startTimer(); } |
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if (e.key === 'ArrowRight') { stopTimer(); next(); startTimer(); } |
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}); |
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|
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startTimer(); |
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} |
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|
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function init() { |
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document.querySelectorAll('.bkbg-is-wrapper').forEach(initSlider); |
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} |
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|
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if (document.readyState === 'loading') { |
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document.addEventListener('DOMContentLoaded', init); |
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} else { |
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init(); |
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} |
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})(); |
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|
