2015-07-27 02:57:43 +00:00
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# Detección del evento en línea/fuera de línea
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La detección de estos eventos puede ser implementada en el proceso renderer utilizando las APIs HTML5 estándar,
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como en este ejemplo:
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_main.js_
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```javascript
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2016-10-03 03:47:16 +00:00
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var app = require('app')
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var BrowserWindow = require('browser-window')
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var onlineStatusWindow
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app.on('ready', function () {
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onlineStatusWindow = new BrowserWindow({ width: 0, height: 0, show: false })
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2016-10-03 22:48:04 +00:00
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onlineStatusWindow.loadURL(`file://${__dirname}/online-status.html`)
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2016-10-03 03:47:16 +00:00
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})
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2015-07-27 02:57:43 +00:00
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```
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_online-status.html_
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```html
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<!DOCTYPE html>
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<html>
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<body>
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<script>
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var alertOnlineStatus = function() {
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window.alert(navigator.onLine ? 'online' : 'offline');
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};
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window.addEventListener('online', alertOnlineStatus);
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window.addEventListener('offline', alertOnlineStatus);
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alertOnlineStatus();
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</script>
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</body>
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</html>
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```
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Existen casos en donde necesitas responder a estos eventos desde el proceso principal.
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El proceso principal no posee un objeto `navigator`, por lo tanto no puede detectar estos eventos directamente.
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Es posible reenviar el evento al proceso principal mediante la utilidad de intercomunicación entre procesos (ipc):
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_main.js_
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```javascript
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2016-10-03 03:47:16 +00:00
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var app = require('app')
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var ipc = require('ipc')
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var BrowserWindow = require('browser-window')
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var onlineStatusWindow
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app.on('ready', function () {
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onlineStatusWindow = new BrowserWindow({ width: 0, height: 0, show: false })
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2016-10-03 22:48:04 +00:00
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onlineStatusWindow.loadURL(`file://${__dirname}/online-status.html`)
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2016-10-03 03:47:16 +00:00
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})
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ipc.on('online-status-changed', function (event, status) {
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console.log(status)
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})
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2015-07-27 02:57:43 +00:00
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```
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_online-status.html_
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```html
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<!DOCTYPE html>
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<html>
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<body>
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<script>
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var ipc = require('ipc');
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var updateOnlineStatus = function() {
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ipc.send('online-status-changed', navigator.onLine ? 'online' : 'offline');
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};
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window.addEventListener('online', updateOnlineStatus);
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window.addEventListener('offline', updateOnlineStatus);
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updateOnlineStatus();
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</script>
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</body>
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</html>
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```
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