@angular/cdk
Version:
Angular Material Component Development Kit
39 lines • 4.73 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { dispatchFakeEvent } from './dispatch-events';
function triggerFocusChange(element, event) {
let eventFired = false;
const handler = () => (eventFired = true);
element.addEventListener(event, handler);
element[event]();
element.removeEventListener(event, handler);
if (!eventFired) {
dispatchFakeEvent(element, event);
}
}
/**
* Patches an elements focus and blur methods to emit events consistently and predictably.
* This is necessary, because some browsers can call the focus handlers asynchronously,
* while others won't fire them at all if the browser window is not focused.
* @docs-private
*/
// TODO: Check if this element focus patching is still needed for local testing,
// where browser is not necessarily focused.
export function patchElementFocus(element) {
element.focus = () => dispatchFakeEvent(element, 'focus');
element.blur = () => dispatchFakeEvent(element, 'blur');
}
/** @docs-private */
export function triggerFocus(element) {
triggerFocusChange(element, 'focus');
}
/** @docs-private */
export function triggerBlur(element) {
triggerFocusChange(element, 'blur');
}
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