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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 initFaqSchema(wrap) { |
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var allowMultiple = wrap.getAttribute('data-allow-multiple') === '1'; |
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var speed = parseInt(wrap.getAttribute('data-speed'), 10) || 300; |
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var items = toArray(wrap.querySelectorAll('.bkbg-faq-item')); |
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var questions = toArray(wrap.querySelectorAll('.bkbg-faq-question')); |
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|
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// Generate accessible IDs |
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var blockId = 'bkbg-faq-' + Math.random().toString(36).substr(2, 9); |
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|
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questions.forEach(function (question, index) { |
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var item = items[index]; |
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var answer = item ? item.querySelector('.bkbg-faq-answer') : null; |
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|
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var qId = blockId + '-q-' + index; |
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var aId = blockId + '-a-' + index; |
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|
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question.id = qId; |
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question.setAttribute('aria-controls', aId); |
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|
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if (answer) { |
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answer.id = aId; |
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answer.setAttribute('aria-labelledby', qId); |
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|
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// Set proper max-height based on initial state |
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var isActive = item.classList.contains('is-active'); |
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if (isActive) { |
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answer.style.maxHeight = answer.scrollHeight + 'px'; |
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} |
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} |
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|
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question.addEventListener('click', function () { |
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var isExpanded = question.getAttribute('aria-expanded') === 'true'; |
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|
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if (!allowMultiple && !isExpanded) { |
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// Close all other items |
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items.forEach(function (otherItem, otherIndex) { |
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if (otherIndex !== index) { |
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var otherQ = questions[otherIndex]; |
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var otherA = otherItem.querySelector('.bkbg-faq-answer'); |
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if (otherQ.getAttribute('aria-expanded') === 'true') { |
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otherQ.setAttribute('aria-expanded', 'false'); |
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otherItem.classList.remove('is-active'); |
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if (otherA) { |
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otherA.setAttribute('aria-hidden', 'true'); |
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otherA.style.maxHeight = '0'; |
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} |
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} |
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} |
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}); |
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} |
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|
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// Toggle current |
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var newState = !isExpanded; |
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question.setAttribute('aria-expanded', newState ? 'true' : 'false'); |
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item.classList.toggle('is-active', newState); |
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|
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if (answer) { |
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answer.setAttribute('aria-hidden', newState ? 'false' : 'true'); |
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if (newState) { |
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// Force repaint to allow transition |
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answer.style.maxHeight = answer.scrollHeight + 'px'; |
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// After transition, set to 'none' so auto-height changes work |
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answer.addEventListener('transitionend', function onEnd() { |
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if (item.classList.contains('is-active')) { |
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answer.style.maxHeight = 'none'; |
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} |
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answer.removeEventListener('transitionend', onEnd); |
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}); |
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} else { |
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// Must set exact height before animating to 0 |
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answer.style.maxHeight = answer.scrollHeight + 'px'; |
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requestAnimationFrame(function () { |
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requestAnimationFrame(function () { |
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answer.style.maxHeight = '0'; |
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}); |
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}); |
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} |
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} |
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}); |
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}); |
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|
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// Keyboard navigation (arrow keys between questions) |
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questions.forEach(function (question, index) { |
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question.addEventListener('keydown', function (e) { |
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var nextIndex = -1; |
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switch (e.key) { |
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case 'ArrowDown': |
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nextIndex = (index + 1) % questions.length; |
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e.preventDefault(); |
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break; |
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case 'ArrowUp': |
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nextIndex = (index - 1 + questions.length) % questions.length; |
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e.preventDefault(); |
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break; |
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case 'Home': |
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nextIndex = 0; |
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e.preventDefault(); |
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break; |
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case 'End': |
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nextIndex = questions.length - 1; |
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e.preventDefault(); |
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break; |
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} |
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if (nextIndex >= 0 && questions[nextIndex]) { |
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questions[nextIndex].focus(); |
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} |
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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-faq-wrap')).forEach(initFaqSchema); |
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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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|
