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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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// Track last focused element before modal opens (for focus restoration) |
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var lastFocused = null; |
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|
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// All focusable selectors |
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var FOCUSABLE = 'a[href],button:not([disabled]),input:not([disabled]),textarea:not([disabled]),select:not([disabled]),[tabindex]:not([tabindex="-1"])'; |
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|
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function trapFocus(modal) { |
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var focusable = toArray(modal.querySelectorAll(FOCUSABLE)).filter(function (el) { |
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return el.offsetParent !== null; |
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}); |
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if (!focusable.length) return; |
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|
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var first = focusable[0]; |
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var last = focusable[focusable.length - 1]; |
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|
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modal.addEventListener('keydown', function onKeyDown(e) { |
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if (e.key !== 'Tab') return; |
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if (focusable.length === 1) { |
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e.preventDefault(); |
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return; |
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} |
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if (e.shiftKey) { |
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if (document.activeElement === first) { |
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e.preventDefault(); |
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last.focus(); |
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} |
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} else { |
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if (document.activeElement === last) { |
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e.preventDefault(); |
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first.focus(); |
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} |
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} |
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}); |
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|
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// Focus first focusable |
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first.focus(); |
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} |
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|
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function openModal(modal) { |
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lastFocused = document.activeElement; |
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modal.setAttribute('aria-hidden', 'false'); |
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modal.classList.add('is-open'); |
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document.body.style.overflow = 'hidden'; |
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trapFocus(modal); |
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} |
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|
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function closeModal(modal) { |
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modal.setAttribute('aria-hidden', 'true'); |
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modal.classList.remove('is-open'); |
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document.body.style.overflow = ''; |
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if (lastFocused) { |
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lastFocused.focus(); |
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lastFocused = null; |
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} |
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} |
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|
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function initModalBlock(block) { |
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var modalId = block.getAttribute('data-modal-id'); |
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if (!modalId) return; |
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|
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var modal = block.querySelector('.bkbg-modal-overlay#' + modalId); |
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var triggers = toArray(block.querySelectorAll('[data-bkbg-modal-open="' + modalId + '"]')); |
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var closeBtns = toArray(block.querySelectorAll('[data-bkbg-modal-close="' + modalId + '"]')); |
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|
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if (!modal) return; |
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|
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var closeOnOverlay = modal.getAttribute('data-close-overlay') !== '0'; |
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var closeOnEsc = modal.getAttribute('data-close-esc') !== '0'; |
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var triggerMode = modal.getAttribute('data-trigger-mode'); |
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var autoDelay = parseInt(modal.getAttribute('data-auto-delay'), 10) || 3000; |
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|
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// Open triggers |
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triggers.forEach(function (btn) { |
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btn.addEventListener('click', function () { |
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openModal(modal); |
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}); |
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}); |
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|
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// Close buttons |
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closeBtns.forEach(function (btn) { |
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btn.addEventListener('click', function () { |
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closeModal(modal); |
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}); |
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}); |
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|
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// Close on overlay click |
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if (closeOnOverlay) { |
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modal.addEventListener('click', function (e) { |
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if (e.target === modal) { |
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closeModal(modal); |
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} |
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}); |
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} |
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|
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// Close on ESC key |
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if (closeOnEsc) { |
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document.addEventListener('keydown', function (e) { |
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if (e.key === 'Escape' && modal.classList.contains('is-open')) { |
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closeModal(modal); |
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} |
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}); |
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} |
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|
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// Auto-open |
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if (triggerMode === 'auto') { |
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// Only auto-open once per session |
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var storageKey = 'bkbg_modal_seen_' + modalId; |
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if (!sessionStorage.getItem(storageKey)) { |
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setTimeout(function () { |
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openModal(modal); |
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sessionStorage.setItem(storageKey, '1'); |
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}, autoDelay); |
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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-modal-block')).forEach(initModalBlock); |
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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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|
