Detect Print Screen key press and display an alert.

by Katarn

JavaScript

window.addEventListener('keydown', function (event) {
  if (
    event.key === 'PrintScreen' ||
    (event.metaKey && event.shiftKey && (event.key === '3' || event.key === '4' || event.key === '5'))
  ) {
    alert('Captura de pantalla detectada');
  }
});