47 lines
1.3 KiB
JavaScript
47 lines
1.3 KiB
JavaScript
/*
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Copyright 2020 Bruno Windels <bruno@windels.cloud>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import {BaseObservableValue} from "../../../observable/ObservableValue.js";
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export class OnlineStatus extends BaseObservableValue {
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constructor() {
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super();
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this._onOffline = this._onOffline.bind(this);
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this._onOnline = this._onOnline.bind(this);
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}
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_onOffline() {
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this.emit(false);
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}
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_onOnline() {
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this.emit(true);
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}
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get value() {
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return navigator.onLine;
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}
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onSubscribeFirst() {
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window.addEventListener('offline', this._onOffline);
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window.addEventListener('online', this._onOnline);
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}
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onUnsubscribeLast() {
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window.removeEventListener('offline', this._onOffline);
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window.removeEventListener('online', this._onOnline);
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}
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}
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