62 lines
2.4 KiB
JavaScript
62 lines
2.4 KiB
JavaScript
"use strict";
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/**
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* The helper functions here will make the target element as modal to screen readers, by placing aria-hidden on elements
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* that are siblings to the target element and the target element's ancestors (because aria-hidden gets inherited).
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* That way, all other elements on the page are hidden to the screen reader.
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.modalize = void 0;
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var getDocument_1 = require("./dom/getDocument");
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/** Tag names to ignore when modalizing */
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var tagsToIgnore = ['TEMPLATE', 'STYLE', 'SCRIPT'];
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/**
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* Call this on a target element to make it modal to screen readers.
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* Returns a function that undoes the changes it made.
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*/
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function modalize(target) {
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var targetDocument = (0, getDocument_1.getDocument)(target);
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if (!targetDocument) {
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// can't do this in SSR
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return function () { return undefined; };
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}
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var affectedNodes = [];
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// start at target, then recurse and do the same for parent, until we reach <body>
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while (target !== targetDocument.body && target.parentElement) {
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// grab all siblings of current element
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for (var _i = 0, _a = target.parentElement.children; _i < _a.length; _i++) {
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var sibling = _a[_i];
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// but ignore elements that are already aria-hidden
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var ariaHidden = sibling.getAttribute('aria-hidden');
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if (sibling !== target && (ariaHidden === null || ariaHidden === void 0 ? void 0 : ariaHidden.toLowerCase()) !== 'true' && tagsToIgnore.indexOf(sibling.tagName) === -1) {
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affectedNodes.push([sibling, ariaHidden]);
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}
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}
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target = target.parentElement;
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}
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// take all those elements and set aria-hidden=true on them
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affectedNodes.forEach(function (_a) {
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var node = _a[0];
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node.setAttribute('aria-hidden', 'true');
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});
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return function () {
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unmodalize(affectedNodes);
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affectedNodes = []; // dispose
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};
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}
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exports.modalize = modalize;
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/**
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* Undoes the changes that modalize() did.
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*/
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function unmodalize(affectedNodes) {
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affectedNodes.forEach(function (_a) {
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var node = _a[0], originalValue = _a[1];
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// Restore the original value (false or unset)
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if (originalValue) {
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node.setAttribute('aria-hidden', originalValue);
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}
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else {
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node.removeAttribute('aria-hidden');
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}
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});
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}
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//# sourceMappingURL=modalize.js.map
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