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(function () { |
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'use strict'; |
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|
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function initTabs(wrapper) { |
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var tabs = Array.prototype.slice.call(wrapper.querySelectorAll('.bkbg-tabs-tab')); |
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var panels = Array.prototype.slice.call(wrapper.querySelectorAll('.bkbg-tabs-panel')); |
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|
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if (!tabs.length || !panels.length) return; |
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|
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function activateTab(index) { |
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tabs.forEach(function (tab, i) { |
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var isActive = i === index; |
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tab.classList.toggle('is-active', isActive); |
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tab.setAttribute('aria-selected', isActive ? 'true' : 'false'); |
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tab.setAttribute('tabIndex', isActive ? '0' : '-1'); |
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}); |
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|
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panels.forEach(function (panel, i) { |
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var isActive = i === index; |
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panel.classList.toggle('is-active', isActive); |
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panel.setAttribute('aria-hidden', isActive ? 'false' : 'true'); |
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if (isActive) { |
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// Restart animation |
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panel.style.animation = 'none'; |
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// Force reflow |
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void panel.offsetHeight; |
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panel.style.animation = ''; |
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} |
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}); |
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} |
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|
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tabs.forEach(function (tab, index) { |
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tab.addEventListener('click', function () { |
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activateTab(index); |
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}); |
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|
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// Keyboard navigation |
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tab.addEventListener('keydown', function (e) { |
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var key = e.key; |
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var tabbar = tab.closest('.bkbg-tabs-tabbar'); |
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var tabList = Array.prototype.slice.call(tabbar ? tabbar.querySelectorAll('.bkbg-tabs-tab') : []); |
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var currentIndex = tabList.indexOf(tab); |
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var isVertical = wrapper.classList.contains('bkbg-tabs-pos-left'); |
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|
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var prevKey = isVertical ? 'ArrowUp' : 'ArrowLeft'; |
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var nextKey = isVertical ? 'ArrowDown' : 'ArrowRight'; |
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|
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if (key === nextKey) { |
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e.preventDefault(); |
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var next = (currentIndex + 1) % tabList.length; |
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tabList[next].focus(); |
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activateTab(next); |
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} else if (key === prevKey) { |
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e.preventDefault(); |
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var prev = (currentIndex - 1 + tabList.length) % tabList.length; |
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tabList[prev].focus(); |
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activateTab(prev); |
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} else if (key === 'Home') { |
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e.preventDefault(); |
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tabList[0].focus(); |
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activateTab(0); |
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} else if (key === 'End') { |
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e.preventDefault(); |
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tabList[tabList.length - 1].focus(); |
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activateTab(tabList.length - 1); |
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} |
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}); |
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}); |
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} |
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|
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// Init on DOMContentLoaded and handle dynamic insertion |
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function init() { |
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var wrappers = Array.prototype.slice.call(document.querySelectorAll('.bkbg-tabs-wrapper')); |
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wrappers.forEach(initTabs); |
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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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