59 lines
1.5 KiB
JavaScript
59 lines
1.5 KiB
JavaScript
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import EventEmitter from 'events';
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import { ONLINE_STATE_CHANGED_EVENT } from './events';
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/**
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* The network info service implementation for web (Chrome, Firefox and Safari).
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*/
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export default class NetworkInfoService extends EventEmitter {
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/**
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* Creates new instance...
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*/
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constructor() {
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super();
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this._onlineStateListener = this._handleOnlineStatusChange.bind(this, /* online */ true);
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this._offlineStateListener = this._handleOnlineStatusChange.bind(this, /* offline */ false);
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}
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/**
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* Callback function to track the online state.
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*
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* @param {boolean} isOnline - Is the browser online or not.
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* @private
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* @returns {void}
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*/
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_handleOnlineStatusChange(isOnline) {
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this.emit(ONLINE_STATE_CHANGED_EVENT, { isOnline });
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}
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/**
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* Checks for support.
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*
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* @returns {boolean}
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*/
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static isSupported() {
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return window.addEventListener && typeof navigator.onLine !== 'undefined';
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}
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/**
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* Starts the service.
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*
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* @returns {void}
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*/
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start() {
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window.addEventListener('online', this._onlineStateListener);
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window.addEventListener('offline', this._offlineStateListener);
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}
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/**
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* Stops the service.
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*
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* @returns {void}
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*/
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stop() {
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window.removeEventListener('online', this._onlineStateListener);
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window.removeEventListener('offline', this._offlineStateListener);
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}
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}
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