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