@oat-sa/tao-core-sdk/dist/core/connectivity.js

Core libraries of TAO

define(['core/eventifier'], function (eventifier) { 'use strict';

    eventifier = eventifier && Object.prototype.hasOwnProperty.call(eventifier, 'default') ? eventifier['default'] : eventifier;

    /**
     * This program is free software; you can redistribute it and/or
     * modify it under the terms of the GNU General Public License
     * as published by the Free Software Foundation; under version 2
     * of the License (non-upgradable).
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program; if not, write to the Free Software
     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
     *
     * Copyright (c) 2017-2019 (original work) Open Assessment Technologies SA ;
     */

    /**
     * @type {Boolean} the current status, true means online
     */
    var status = navigator.onLine;

    /**
     * The connectivity module
     * @typedef {connectivity}
     */
    var connectivity = eventifier({
      /**
       * Set manually as online
       * @returns {connectivity} chains
       * @fires {connectivity#online}
       * @fires {connectivity#change}
       */
      setOnline: function setOnline() {
        if (this.isOffline()) {
          status = true;
          this.trigger('online').trigger('change', status);
        }
        return this;
      },
      /**
       * Set manually as offline
       * @returns {connectivity} chains
       * @fires {connectivity#offline}
       * @fires {connectivity#change}
       */
      setOffline: function setOffline() {
        if (this.isOnline()) {
          status = false;
          this.trigger('offline').trigger('change', status);
        }
        return this;
      },
      /**
       * Are we online ?
       * @returns {Boolean}
       */
      isOnline: function isOnline() {
        return status;
      },
      /**
       * Are we offline
       * @returns {Boolean}
       */
      isOffline: function isOffline() {
        return !status;
      }
    });

    //DOM Events : online/offline
    window.addEventListener('online', function () {
      connectivity.setOnline();
    });
    window.addEventListener('offline', function () {
      connectivity.setOffline();
    });

    return connectivity;

});