Window: online event - Web APIs 编辑

The online event of the Window interface is fired when the browser has gained access to the network and the value of 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.

Bubbles	No
Cancelable	No
Interface	Event
Event handler property	ononline

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

Specification	Status
HTML Living Standard The definition of 'online event' in that specification.	Living Standard

Browser compatibility

BCD tables only load in the browser

See also

• offline