system/admin/publish.php

<?php
namespace Habari;
if ( !defined( 'HABARI_PATH' ) ) { die('No direct access'); }
?>
<?php include('header.php'); ?>

  <?php $form->out(); ?>


<script type="text/javascript">
$(document).ready(function(){


  // Submit when the publish button is clicked.
  $('#publish').click( function() {
    $('#create_content').submit();
  });

  $('#create_content').submit(function(){
    $('.check-change').each(function() {
      $(this).data('checksum', crc32($(this).val()));
    });
  });

  $('.check-change').each(function() {
    $(this).data('checksum', crc32($(this).val()));
    $(this).data('oldvalue', $(this).val());
  });

  window.onbeforeunload = function(){
    changed = false;
    $('.check-change').each(function() {
      if ($(this).data('checksum') != crc32($(this).val())) {
        console.log([$(this).data('oldvalue'), $(this).val()]);
        changed = true;
      }
    });
    if (changed) {
      spinner.start(); spinner.stop();
      return '<?php
        // Note to translators: the 'new-line character' is an actual "\n" not a new-line character
        _e('You did not save the changes you made. \nLeaving this page will result in the loss of data.');
        ?>';
    }
  };

});
</script>

<?php include('footer.php'); ?>