control [removed] event

Question

From out of curiosity can i Control window.onbeforeunload event like check if the user decided to leave the page or stay in it and can I raise an alert or some function based on

Answer 1

Put a timer of one second. Clear it on unload. Should work, but didn't test it.

window.addEventListener('beforeunload', function (event) {

  var timeId = setTimeout(yourFunctionIfTheUserStays, 1000);

  window.addEventListener('unload', function (event) {
    clearTimeout(timeId);
  })
  return 'Are you sure you want to leave this page?';
});