Check if changes saved before unload

Question

I have the following JavaScript

EDIT: included assignments for changesSaved

 var changesSaved = true;

    $(document).ready(function ()         


        

Answer 1

window.onbeforeunload = function () {
     var changesSaved = confirm("You havent saved your changes. Are you sure you want to leave the page?");
    if (changesSaved) {
        return true;
    } else {
        return false;
    }