import Utils from './aria-utils';
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/**
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* @constructor
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* @desc Dialog object providing modal focus management.
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*
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* Assumptions: The element serving as the dialog container is present in the
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* DOM and hidden. The dialog container has role='dialog'.
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*
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* @param dialogId
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* The ID of the element serving as the dialog container.
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* @param focusAfterClosed
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* Either the DOM node or the ID of the DOM node to focus when the
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* dialog closes.
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* @param focusFirst
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* Optional parameter containing either the DOM node or the ID of the
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* DOM node to focus when the dialog opens. If not specified, the
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* first focusable element in the dialog will receive focus.
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*/
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var aria = aria || {};
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var tabEvent;
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aria.Dialog = function(dialog, focusAfterClosed, focusFirst) {
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this.dialogNode = dialog;
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if (this.dialogNode === null || this.dialogNode.getAttribute('role') !== 'dialog') {
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throw new Error('Dialog() requires a DOM element with ARIA role of dialog.');
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}
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if (typeof focusAfterClosed === 'string') {
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this.focusAfterClosed = document.getElementById(focusAfterClosed);
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} else if (typeof focusAfterClosed === 'object') {
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this.focusAfterClosed = focusAfterClosed;
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} else {
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this.focusAfterClosed = null;
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}
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if (typeof focusFirst === 'string') {
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this.focusFirst = document.getElementById(focusFirst);
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} else if (typeof focusFirst === 'object') {
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this.focusFirst = focusFirst;
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} else {
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this.focusFirst = null;
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}
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if (this.focusFirst) {
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this.focusFirst.focus();
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} else {
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Utils.focusFirstDescendant(this.dialogNode);
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}
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this.lastFocus = document.activeElement;
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tabEvent = (e) => {
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this.trapFocus(e);
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};
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this.addListeners();
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};
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aria.Dialog.prototype.addListeners = function() {
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document.addEventListener('focus', tabEvent, true);
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};
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aria.Dialog.prototype.removeListeners = function() {
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document.removeEventListener('focus', tabEvent, true);
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};
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aria.Dialog.prototype.closeDialog = function() {
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this.removeListeners();
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if (this.focusAfterClosed) {
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setTimeout(() => {
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this.focusAfterClosed.focus();
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});
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}
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};
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aria.Dialog.prototype.trapFocus = function(event) {
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if (Utils.IgnoreUtilFocusChanges) {
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return;
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}
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if (this.dialogNode.contains(event.target)) {
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this.lastFocus = event.target;
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} else {
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Utils.focusFirstDescendant(this.dialogNode);
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if (this.lastFocus === document.activeElement) {
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Utils.focusLastDescendant(this.dialogNode);
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}
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this.lastFocus = document.activeElement;
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}
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};
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export default aria.Dialog;
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