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closest.ts
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closest.ts
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/*
* Copyright 2019 LABOR.digital
*
* 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.
*
* Last modified: 2019.01.11 at 19:43
*/
import {isFunction} from '../Types/isFunction';
import {isObject} from '../Types/isObject';
/**
* A polifill for "closest()" element in internet explorer without jquery:
* https://stackoverflow.com/questions/18663941/finding-closest-element-without-jquery
*
* @param selector The selector to find
* @param to The element to use as starting point
*/
export function closest(selector: string, to: HTMLElement): HTMLElement | null
{
if (!isObject(to)) {
return null;
}
if (isFunction(to.closest)) {
return to.closest(selector) as HTMLElement | null;
}
let el = to;
while (el) {
const matches = isFunction(el.matches) ? el.matches : (el as any).msMatchesSelector.bind(el);
if (matches(selector)) {
return el;
}
if (!el.parentElement) {
return null;
}
el = el.parentElement;
}
return null;
}