focus-lock/dist/es2019/utils/tabOrder.js

DOM trap for a focus

import { toArray } from './array';
export const tabSort = (a, b) => {
    const aTab = Math.max(0, a.tabIndex);
    const bTab = Math.max(0, b.tabIndex);
    const tabDiff = aTab - bTab;
    const indexDiff = a.index - b.index;
    if (tabDiff) {
        if (!aTab) {
            return 1;
        }
        if (!bTab) {
            return -1;
        }
    }
    return tabDiff || indexDiff;
};
const getTabIndex = (node) => {
    if (node.tabIndex < 0) {
        // all "focusable" elements are already preselected
        // but some might have implicit negative tabIndex
        // return 0 for <audio without tabIndex attribute - it is "tabbable"
        if (!node.hasAttribute('tabindex')) {
            return 0;
        }
    }
    return node.tabIndex;
};
export const orderByTabIndex = (nodes, filterNegative, keepGuards) => toArray(nodes)
    .map((node, index) => {
    const tabIndex = getTabIndex(node);
    return {
        node,
        index,
        tabIndex: keepGuards && tabIndex === -1 ? ((node.dataset || {}).focusGuard ? 0 : -1) : tabIndex,
    };
})
    .filter((data) => !filterNegative || data.tabIndex >= 0)
    .sort(tabSort);