Activating OnBeforeUnload ONLY when field values have changed

Question

What I\'m trying to achieve is to Warn the user of unsaved changes if he/she tries to close a page or navigate away from it without saving first.

I\'ve managed to g

Answer 1

The following works well in jQuery:

var needToConfirm = false;

$("input,textarea").on("input", function() {
  needToConfirm = true;
});

$("select").change(function() {
  needToConfirm = true;
});

window.onbeforeunload = function(){        
  if(needToConfirm) {
    return "If you exit this page, your unsaved changes will be lost.";        
  }
}   

And if the user is submitting a form to save the changes, you might want to add this (change #mainForm to the ID of the form they're submitting):

$("#mainForm").submit(function() {
  needToConfirm = false;
});