Zabbix

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** 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 Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

​

/**

 * Amount of seconds for keep-alive interval.

 */

ZBX_BrowserTab.keep_alive_interval = 30;

​

/**

 * This object is representing a browser tab. Implements singleton pattern. It ensures there are only non-crashed tabs

 * in store.

 *

 * @param {ZBX_LocalStorage} store  A localStorage wrapper.

 */

function ZBX_BrowserTab(store) {

    if (ZBX_BrowserTab.instance) {

        return ZBX_BrowserTab.instance;

    }

​

    if (!(store instanceof ZBX_LocalStorage)) {

        throw 'Unmatched signature!';

    }

​

    ZBX_BrowserTab.instance = this;

​

    this.uid = (Math.random() % 9e6).toString(36).substr(2);

    this.store = store;

​

    var ctx_lastseen = this.store.readKey('tabs.lastseen', {});

    ctx_lastseen[this.uid] = Math.floor(+new Date / 1000);

​

    this.lastseen = ctx_lastseen;

​

    this.on_focus_cbs = [];

    this.on_blur_cbs = [];

    this.on_unload_cbs = [];

    this.on_crashed_cbs = [];

​

    this.bindEventHandlers();

    this.pushLastseen();

}

​

/**

 * @param {object} lastseen

 */

ZBX_BrowserTab.prototype.handlePushedLastseen = function(lastseen) {

    this.lastseen = lastseen;

};

​

/**

 * Checks and updates current lastseen object.