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