blob: c1602cf01cb031d58cb4173710dad23ba9ca9f74 (
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// Setup tab focus
const container = document.getElementById('container');
const tabClassName = 'tab-focus';
// Remove class on blur
document.addEventListener('focusout', event => {
if (!event.target.classList || container.contains(event.target)) {
return;
}
event.target.classList.remove(tabClassName);
});
// Add classname to tabbed elements
document.addEventListener('keydown', event => {
if (event.keyCode !== 9) {
return;
}
// Delay the adding of classname until the focus has changed
// This event fires before the focusin event
setTimeout(() => {
const focused = document.activeElement;
if (!focused || !focused.classList || container.contains(focused)) {
return;
}
focused.classList.add(tabClassName);
}, 10);
});
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