52 lines
1.8 KiB
JavaScript
52 lines
1.8 KiB
JavaScript
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/* *
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*
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* (c) 2009-2020 Øystein Moseng
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*
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* Create announcer to speak messages to screen readers and other AT.
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*
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* License: www.highcharts.com/license
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*
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* !!!!!!! SOURCE GETS TRANSPILED BY TYPESCRIPT. EDIT TS FILE ONLY. !!!!!!!
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*
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* */
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'use strict';
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import H from '../../../parts/Globals.js';
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import DOMElementProvider from './DOMElementProvider.js';
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import HTMLUtilities from './htmlUtilities.js';
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var visuallyHideElement = HTMLUtilities.visuallyHideElement;
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var Announcer = /** @class */ (function () {
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function Announcer(chart, type) {
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this.chart = chart;
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this.domElementProvider = new DOMElementProvider();
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this.announceRegion = this.addAnnounceRegion(type);
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}
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Announcer.prototype.destroy = function () {
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this.domElementProvider.destroyCreatedElements();
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};
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Announcer.prototype.announce = function (message) {
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var _this = this;
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this.announceRegion.innerHTML = message;
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// Delete contents after a little while to avoid user finding the live
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// region in the DOM.
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if (this.clearAnnouncementRegionTimer) {
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clearTimeout(this.clearAnnouncementRegionTimer);
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}
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this.clearAnnouncementRegionTimer = setTimeout(function () {
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_this.announceRegion.innerHTML = '';
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delete _this.clearAnnouncementRegionTimer;
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}, 1000);
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};
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Announcer.prototype.addAnnounceRegion = function (type) {
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var chartContainer = this.chart.renderTo;
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var div = this.domElementProvider.createElement('div');
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div.setAttribute('aria-hidden', false);
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div.setAttribute('aria-live', type);
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visuallyHideElement(div);
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chartContainer.insertBefore(div, chartContainer.firstChild);
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return div;
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};
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return Announcer;
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}());
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H.Announcer = Announcer;
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export default Announcer;
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