confirmation before leaving page

i've a situation, where users have to fill out a very lengthy form. and i want users get confirmation when they try to close the browser or browser tab or click any link on the page. but if they hit the submit or archive button they won't get that alert. any help comment or feedback would be deeply appreciated.


<p><a href="">link</a></p>

<form method="post" name="Form1" action="#">

<input type="text" name="fname" id="fname" size="32" />
<input type="text" name="lname" id="lname" size="32" />
<br />
<input type="submit" name="archive" id="archive" value="archive" />
<input type="submit" name="submit" id="submit" value="save" />

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Test page :
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var submit_or_archive = false;

window.onbeforeunload = function() {
    if(!submit_or_archive) return "You're going to leave\nCancel to complete and\npost the form first!"

window.onload = function() {
    document.getElementById("mySubmitButton").onclick = function() {
        submit_or_archive = true;
    document.getElementById("myArchiveButton").onclick = function() {
        submit_or_archive = true;

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