SonataAdminBundle/Resources/public/jquery/jquery.confirmExit.js

/*!
* jQuery confirmExit plugin
* https://github.com/dunglas/jquery.confirmExit
*
* Copyright 2012 Kévin Dunglas <dunglas@gmail.com>
* Released under the MIT license
* http://www.opensource.org/licenses/mit-license.php
*/
(function ($) {
	$.fn.confirmExit = function(message) {
		var confirmExit = false;

		$('input, textarea, select', this).on('change keyup', function() {
			// Do not set the event handler if not needed
			if (!confirmExit) {
				confirmExit = true;

				window.onbeforeunload = function(event) {
					var e = event || window.event;

					// For old IE and Firefox
					if (e) {
						e.returnValue = message;
					}

					return message;
				}
			}
		});

		this.submit(function() {
			window.onbeforeunload = null;
			confirmExit = false;
		});

		return this;
	}
	})(jQuery);