onoffline Event

Call a function when the browser starts to work offline:

More examples below.

Description

The onoffline event occurs when the browser starts to work offline.

The onoffline event is the opposite of the ononline event.

You can also use the navigator.onLine property to find out if the browser offline.

In HTML:

< element onoffline=" myScript">

In JavaScript:

object.onoffline = function(){ myScript};

In JavaScript, using the addEventListener() method:

object.addEventListener("offline", myScript);

onoffline is a DOM Level 3 (2004) feature.

It is fully supported in all modern browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	11