The change event of the ScreenOrientation interface fires when the orientation of the screen has changed, for example when a user rotates their mobile phone.

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

addEventListener("change", (event) => {});

onchange = (event) => {};

A generic Event.

In the following example, the change callback prints the new screen orientation type and angle.

screen.orientation.addEventListener("change", (event) => {
  const type = event.target.type;
  const angle = event.target.angle;
  console.log(`ScreenOrientation change: ${type}, ${angle} degrees.`);
});