The ScreenOrientation interface of the Screen Orientation API provides information about the current orientation of the document.

A ScreenOrientation instance object can be retrieved using the screen.orientation property.

ScreenOrientation.type Read only

Returns the document's current orientation type, one of "portrait-primary", "portrait-secondary", "landscape-primary", or "landscape-secondary".

ScreenOrientation.angle Read only

Returns the document's current orientation angle.

Listen to these events using addEventListener() or by assigning an event listener to the oneventname property of this interface.

change

Fired whenever the screen changes orientation.

ScreenOrientation.lock()

Locks the orientation of the containing document to its default orientation and returns a Promise.

ScreenOrientation.unlock()

Unlocks the orientation of the containing document from its default orientation.

In the following example, we listen for an orientation change event and log 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.`);
});