Window: online event

BaselineWidely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Theonline event of theWindow interface is fired when the browser has gained access to the network and the value ofNavigator.onLine switches totrue.

Note:This event shouldn't be used to determine the availability of a particular website. Network problems or firewalls might still prevent the website from being reached.

Syntax

Use the event name in methods likeaddEventListener(), or set an event handler property.

addEventListener("online", (event) => { })ononline = (event) => { }

Event type

A genericEvent.

Event handler aliases

In addition to theWindow interface, the event handler propertyononline is also available on the following targets:

Examples

// addEventListener versionwindow.addEventListener("online", (event) => {  console.log("You are now connected to the network.");});// ononline versionwindow.ononline = (event) => {  console.log("You are now connected to the network.");};