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event.js
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event.js
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/**
* Copyright 2017 The AMP HTML Authors. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @constructor
*/
function Event(name, params) {
if (!name) {
throw new TypeError(
"Failed to construct 'Event': 1 argument required but only 0 present",
'event.js',
20
);
}
params = params || {bubbles: false, cancelable: false};
const evt = self.document.createEvent('Event');
evt.initEvent(
name,
params.bubbles,
params.cancelable
);
return evt;
}
/**
* Sets the Event polyfill if it does not exist.
* @param {!Window} win
*/
export function install(win) {
// win.Event is a function on Edge, Chrome, FF, Safari but
// is an object on IE 11.
if (typeof win.Event !== 'function') {
// supports >= IE 9. Below IE 9, window.Event.prototype is undefined
Event.prototype = win.Event.prototype;
win.Object.defineProperty(win, 'Event', {
configurable: false,
enumerable: false,
value: Event,
writable: false,
});
}
}