jQuery unload()

Introduction

Alert a message when navigating away from the page:

View in separate window 

<!DOCTYPE html>
<html>
<head>
<script 
 src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
</script>/*from  w ww  .j av  a  2  s .c om*/
<script>
$(document).ready(function(){
  $(window).unload(function(){
    document.getElementById("demo").innerHTML = "Goodbye!";
  });
});
</script>
</head>
<body>

<p id="demo"></p>
<p>When you click <a href="http://java2s.com">this link</a>, 
or close the window, an event will be triggered.</p>

</body>
</html>

The unload() method was deprecated in jQuery version 1.8 and removed in version 3.0.

The unload event occurs when the user navigates away from the page.

The unload() method handles the unload event. 

$(selector).unload(function)
Parameter OptionalDescription
function Required. function to run when the unload event is triggered



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