The event fires when an application goes offline, and the device is not connected to the Internet.

document.addEventListener("offline", yourCallbackFunction, false);


The offline event fires when a previously connected device loses a network connection so that an application can no longer access the Internet. It relies on the same information as the Connection API, and fires when the [connection.type](../connection/connection.type.html) changes from NONE to any other value.

Applications typically should use document.addEventListener to attach an event listener once the [deviceready](events.deviceready.html) event fires.

Supported Platforms

  • Amazon Fire OS
  • Android
  • BlackBerry 10
  • iOS
  • Windows Phone 7 and 8
  • Tizen
  • Windows 8

Quick Example

document.addEventListener("offline", onOffline, false);

function onOffline() {
    // Handle the offline event

Full Example

<!DOCTYPE html>
    <title>Offline Example</title>

    <script type="text/javascript" charset="utf-8" src="cordova.js"></script>
    <script type="text/javascript" charset="utf-8">

    // Wait for device API libraries to load
    function onLoad() {
        document.addEventListener("deviceready", onDeviceReady, false);

    // device APIs are available
    function onDeviceReady() {
        document.addEventListener("offline", onOffline, false);

    // Handle the offline event
    function onOffline() {

  <body onload="onLoad()">

iOS Quirks

During initial startup, the first offline event (if applicable) takes at least a second to fire.

Windows Phone 7 Quirks

When running in the Emulator, the connection.status is always unknown, so this event does not fire.

Windows Phone 8 Quirks

The Emulator reports the connection.type as Cellular, which does not change, so the event does not fire.