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(function () { |
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function toArray(nl) { |
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return Array.prototype.slice.call(nl || []); |
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} |
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|
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function initToggle(wrap) { |
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var trigger = wrap.querySelector('.bkbg-tgl-trigger'); |
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var content = wrap.querySelector('.bkbg-tgl-content'); |
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if (!trigger || !content) return; |
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|
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var speed = parseInt(wrap.getAttribute('data-speed'), 10) || 280; |
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|
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// Set initial max-height for open state |
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if (wrap.classList.contains('is-open')) { |
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content.style.maxHeight = content.scrollHeight + 'px'; |
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} |
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|
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trigger.addEventListener('click', function () { |
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var isOpen = wrap.classList.contains('is-open'); |
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|
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if (isOpen) { |
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// Closing: set explicit height first, then animate to 0 |
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content.style.maxHeight = content.scrollHeight + 'px'; |
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requestAnimationFrame(function () { |
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requestAnimationFrame(function () { |
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content.style.maxHeight = '0'; |
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wrap.classList.remove('is-open'); |
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trigger.setAttribute('aria-expanded', 'false'); |
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content.setAttribute('aria-hidden', 'true'); |
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}); |
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}); |
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} else { |
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// Opening |
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wrap.classList.add('is-open'); |
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trigger.setAttribute('aria-expanded', 'true'); |
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content.setAttribute('aria-hidden', 'false'); |
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content.style.maxHeight = content.scrollHeight + 'px'; |
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|
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content.addEventListener('transitionend', function onEnd() { |
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if (wrap.classList.contains('is-open')) { |
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content.style.maxHeight = 'none'; |
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} |
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content.removeEventListener('transitionend', onEnd); |
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}); |
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} |
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}); |
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|
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// Keyboard support |
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trigger.addEventListener('keydown', function (e) { |
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if (e.key === 'Enter' || e.key === ' ') { |
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e.preventDefault(); |
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trigger.click(); |
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} |
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}); |
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} |
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|
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function init() { |
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toArray(document.querySelectorAll('.bkbg-tgl-wrap')).forEach(initToggle); |
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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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|
