| 1 | /**
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| 2 | * The helper functions here will make the target element as modal to screen readers, by placing aria-hidden on elements
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| 3 | * that are siblings to the target element and the target element's ancestors (because aria-hidden gets inherited).
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| 4 | * That way, all other elements on the page are hidden to the screen reader.
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| 5 | */
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| 6 | import { getDocument } from './dom/getDocument';
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| 7 | /**
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| 8 | * Call this on a target element to make it modal to screen readers.
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| 9 | * Returns a function that undoes the changes it made.
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| 10 | */
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| 11 | export function modalize(target) {
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| 12 | var _a;
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| 13 | var affectedNodes = [];
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| 14 | var targetDocument = getDocument(target) || document;
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| 15 | // start at target, then recurse and do the same for parent, until we reach <body>
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| 16 | while (target !== targetDocument.body) {
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| 17 | // grab all siblings of current element
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| 18 | for (var _i = 0, _b = target.parentElement.children; _i < _b.length; _i++) {
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| 19 | var sibling = _b[_i];
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| 20 | // but ignore elements that are already aria-hidden
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| 21 | if (sibling !== target && ((_a = sibling.getAttribute('aria-hidden')) === null || _a === void 0 ? void 0 : _a.toLowerCase()) !== 'true') {
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| 22 | affectedNodes.push(sibling);
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| 23 | }
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| 24 | }
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| 25 | if (!target.parentElement) {
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| 26 | break;
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| 27 | }
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| 28 | target = target.parentElement;
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| 29 | }
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| 30 | // take all those elements and set aria-hidden=true on them
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| 31 | affectedNodes.forEach(function (node) {
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| 32 | node.setAttribute('aria-hidden', 'true');
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| 33 | });
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| 34 | return function () {
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| 35 | unmodalize(affectedNodes);
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| 36 | affectedNodes = []; // dispose
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| 37 | };
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| 38 | }
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| 39 | /**
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| 40 | * Undoes the changes that modalize() did.
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| 41 | */
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| 42 | function unmodalize(affectedNodes) {
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| 43 | affectedNodes.forEach(function (node) {
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| 44 | // set instead of removing in case other components explicitly set aria-hidden and do =="true" or =="false"
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| 45 | node.setAttribute('aria-hidden', 'false');
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| 46 | });
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| 47 | }
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| 48 | //# sourceMappingURL=modalize.js.map |
| \ | No newline at end of file |