2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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import Utils from './aria-utils';
/**
* @constructor
* @desc Dialog object providing modal focus management.
*
* Assumptions: The element serving as the dialog container is present in the
* DOM and hidden. The dialog container has role='dialog'.
*
* @param dialogId
* The ID of the element serving as the dialog container.
* @param focusAfterClosed
* Either the DOM node or the ID of the DOM node to focus when the
* dialog closes.
* @param focusFirst
* Optional parameter containing either the DOM node or the ID of the
* DOM node to focus when the dialog opens. If not specified, the
* first focusable element in the dialog will receive focus.
*/
var aria = aria || {};
var tabEvent;
aria.Dialog = function(dialog, focusAfterClosed, focusFirst) {
this.dialogNode = dialog;
if (this.dialogNode === null || this.dialogNode.getAttribute('role') !== 'dialog') {
throw new Error('Dialog() requires a DOM element with ARIA role of dialog.');
}
if (typeof focusAfterClosed === 'string') {
this.focusAfterClosed = document.getElementById(focusAfterClosed);
} else if (typeof focusAfterClosed === 'object') {
this.focusAfterClosed = focusAfterClosed;
} else {
this.focusAfterClosed = null;
}
if (typeof focusFirst === 'string') {
this.focusFirst = document.getElementById(focusFirst);
} else if (typeof focusFirst === 'object') {
this.focusFirst = focusFirst;
} else {
this.focusFirst = null;
}
if (this.focusFirst) {
this.focusFirst.focus();
} else {
Utils.focusFirstDescendant(this.dialogNode);
}
this.lastFocus = document.activeElement;
tabEvent = (e) => {
this.trapFocus(e);
};
this.addListeners();
};
aria.Dialog.prototype.addListeners = function() {
document.addEventListener('focus', tabEvent, true);
};
aria.Dialog.prototype.removeListeners = function() {
document.removeEventListener('focus', tabEvent, true);
};
aria.Dialog.prototype.closeDialog = function() {
this.removeListeners();
if (this.focusAfterClosed) {
setTimeout(() => {
this.focusAfterClosed.focus();
});
}
};
aria.Dialog.prototype.trapFocus = function(event) {
if (Utils.IgnoreUtilFocusChanges) {
return;
}
if (this.dialogNode.contains(event.target)) {
this.lastFocus = event.target;
} else {
Utils.focusFirstDescendant(this.dialogNode);
if (this.lastFocus === document.activeElement) {
Utils.focusLastDescendant(this.dialogNode);
}
this.lastFocus = document.activeElement;
}
};
export default aria.Dialog;
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