ScreenDetails: screenschange event

Limited availabilitySecure context

The screenschange event of the ScreenDetails interface is fired when the set of screens available to the system has changed: that is, a new screen has become available or an existing screen has become unavailable. This will be reflected in a change in the screens array.

Syntax

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

addEventListener("screenschange", (event) => { })

onscreenschange = (event) => { }

Event type

A generic Event.

Examples

You could use the screenschange event to detect when the available screens have changed, report the change, close all windows, and then reopen them all to suit the new configuration:

const screenDetails = await window.getScreenDetails();

// Return the number of screens
let noOfScreens = screenDetails.screens.length;

screenDetails.addEventListener("screenschange", () => {
  // If the new number of screens is different to the old number of screens, report the difference
  if (screenDetails.screens.length !== noOfScreens) {
    console.log(
      `The screen count changed from ${noOfScreens} to ${screenDetails.screens.length}`,
    );

    // Update noOfScreens value
    noOfScreens = screenDetails.screens.length;
  }

  // Open, close, or rearrange windows as needed, to fit the new screen configuration
  updateWindows();
});

Specifications

Browser compatibility

See also

• Window Management API