Window: online event

{{APIRef}} 

The online event of the {{domxref("Window")}}  interface is fired when the browser has gained access to the network and the value of {{domxref("Navigator.onLine")}}  switches to true.

[!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 like {{domxref("EventTarget.addEventListener", "addEventListener()")}} , or set an event handler property.

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

Event type

A generic {{domxref("Event")}} .

Event handler aliases

In addition to the Window interface, the event handler property ononline is also available on the following targets:

• {{domxref("HTMLBodyElement")}} 
• {{domxref("HTMLFrameSetElement")}} 
• {{domxref("SVGSVGElement")}} 

Examples

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

// ononline version
window.ononline = (event) => {
  console.log("You are now connected to the network.");
};

Specifications

{{Specifications}} 

Browser compatibility

{{Compat}} 

See also

• offline