diff --git a/code/model/UserDefinedForm.php b/code/model/UserDefinedForm.php
index 8deebd3..e1abcdf 100755
--- a/code/model/UserDefinedForm.php
+++ b/code/model/UserDefinedForm.php
@@ -87,6 +87,15 @@ class UserDefinedForm extends Page {
 	 */
 	private static $error_container_id = 'error-container';
 
+	/**
+	 * The configuration used to determine whether a confirmation message is to
+	 * appear when navigating away from a partially completed form.
+	 *
+	 * @var boolean
+	 * @config
+	 */
+	private static $enable_are_you_sure = true;
+
 	/**
 	 * Temporary storage of field ids when the form is duplicated.
 	 * Example layout: array('EditableCheckbox3' => 'EditableCheckbox14')
@@ -335,6 +344,12 @@ class UserDefinedForm_Controller extends Page_Controller {
 		if($this->HideFieldLabels) {
 			Requirements::javascript(USERFORMS_DIR . '/thirdparty/Placeholders.js/Placeholders.min.js');
 		}
+
+		// Bind a confirmation message when navigating away from a partially completed form.
+		$page = $this->data();
+		if($page::config()->enable_are_you_sure) {
+			Requirements::javascript(USERFORMS_DIR . '/thirdparty/jquery.are-you-sure/jquery.are-you-sure.js');
+		}
 	}
 
 	/**
diff --git a/javascript/UserForm.js b/javascript/UserForm.js
index e913837..5e7eac6 100644
--- a/javascript/UserForm.js
+++ b/javascript/UserForm.js
@@ -612,7 +612,7 @@ jQuery(function ($) {
 	 */
 	FormActions.prototype.update = function () {
 		var numberOfSteps = userform.steps.length,
-			stepID = userform.currentStep.id,
+			stepID = userform.currentStep ? userform.currentStep.id : 0,
 			i, lastStep;
 
 		// Update the "Prev" button.
@@ -721,6 +721,14 @@ jQuery(function ($) {
 		setInterval(function () {
 			$.ajax({ url: 'UserDefinedForm_Controller/ping' });
 		}, 180 * 1000);
+
+		// Bind a confirmation message when navigating away from a partially completed form.
+		var form = $('form.userform');
+		if(typeof form.areYouSure != 'undefined') {
+			form.areYouSure({
+				message: ss.i18n._t('UserForms.LEAVE_CONFIRMATION', 'You have unsaved changes!')
+			});
+		}
 	}
 
 	main();
diff --git a/javascript/lang/en.js b/javascript/lang/en.js
index 41915ee..d11a2b2 100644
--- a/javascript/lang/en.js
+++ b/javascript/lang/en.js
@@ -15,6 +15,7 @@ if(typeof(ss) == 'undefined' || typeof(ss.i18n) == 'undefined') {
     "UserForms.ERROR_CREATING_OPTION": "Error creating option",
     "UserForms.REMOVED_OPTION": "Removed option",
     "UserForms.ADDING_RULE": "Adding rule",
+    "UserForms.LEAVE_CONFIRMATION": "You have unsaved changes!",
     "GRIDFIELD.ERRORINTRANSACTION": "An error occured while fetching data from the server\n Please try again later."
 });
-}
\ No newline at end of file
+}
diff --git a/javascript/lang/src/en.js b/javascript/lang/src/en.js
index 3990fbd..c8a4306 100644
--- a/javascript/lang/src/en.js
+++ b/javascript/lang/src/en.js
@@ -10,5 +10,6 @@
     "UserForms.ERROR_CREATING_OPTION": "Error creating option",
     "UserForms.REMOVED_OPTION": "Removed option",
     "UserForms.ADDING_RULE": "Adding rule",
+    "UserForms.LEAVE_CONFIRMATION": "You have unsaved changes!",
     "GRIDFIELD.ERRORINTRANSACTION": "An error occured while fetching data from the server\n Please try again later."
-}
\ No newline at end of file
+}
diff --git a/readme.md b/readme.md
index b4c8ef3..1749c8d 100644
--- a/readme.md
+++ b/readme.md
@@ -22,6 +22,7 @@ See the "require" section of [composer.json](https://github.com/silverstripe/sil
 *  Define custom error messages and validation settings
 *  Optionally display and hide fields using javascript based on users input
 *  Pre fill your form fields, by passing your values by url (http://yoursite.com/formpage?EditableField1=MyValue)
+*  Displays a confirmation message when navigating away from a partially completed form.
 
 ## Installation
 
diff --git a/thirdparty/jquery.are-you-sure/jquery.are-you-sure.js b/thirdparty/jquery.are-you-sure/jquery.are-you-sure.js
new file mode 100644
index 0000000..3c41e2f
--- /dev/null
+++ b/thirdparty/jquery.are-you-sure/jquery.are-you-sure.js
@@ -0,0 +1,192 @@
+/*!
+ * jQuery Plugin: Are-You-Sure (Dirty Form Detection)
+ * https://github.com/codedance/jquery.AreYouSure/
+ *
+ * Copyright (c) 2012-2014, Chris Dance and PaperCut Software http://www.papercut.com/
+ * Dual licensed under the MIT or GPL Version 2 licenses.
+ * http://jquery.org/license
+ *
+ * Author:  chris.dance@papercut.com
+ * Version: 1.9.0
+ * Date:    13th August 2014
+ */
+(function($) {
+  
+  $.fn.areYouSure = function(options) {
+      
+    var settings = $.extend(
+      {
+        'message' : 'You have unsaved changes!',
+        'dirtyClass' : 'dirty',
+        'change' : null,
+        'silent' : false,
+        'addRemoveFieldsMarksDirty' : false,
+        'fieldEvents' : 'change keyup propertychange input',
+        'fieldSelector': ":input:not(input[type=submit]):not(input[type=button])"
+      }, options);
+
+    var getValue = function($field) {
+      if ($field.hasClass('ays-ignore')
+          || $field.hasClass('aysIgnore')
+          || $field.attr('data-ays-ignore')
+          || $field.attr('name') === undefined) {
+        return null;
+      }
+
+      if ($field.is(':disabled')) {
+        return 'ays-disabled';
+      }
+
+      var val;
+      var type = $field.attr('type');
+      if ($field.is('select')) {
+        type = 'select';
+      }
+
+      switch (type) {
+        case 'checkbox':
+        case 'radio':
+          val = $field.is(':checked');
+          break;
+        case 'select':
+          val = '';
+          $field.find('option').each(function(o) {
+            var $option = $(this);
+            if ($option.is(':selected')) {
+              val += $option.val();
+            }
+          });
+          break;
+        default:
+          val = $field.val();
+      }
+
+      return val;
+    };
+
+    var storeOrigValue = function($field) {
+      $field.data('ays-orig', getValue($field));
+    };
+
+    var checkForm = function(evt) {
+
+      var isFieldDirty = function($field) {
+        var origValue = $field.data('ays-orig');
+        if (undefined === origValue) {
+          return false;
+        }
+        return (getValue($field) != origValue);
+      };
+
+      var $form = ($(this).is('form')) 
+                    ? $(this)
+                    : $(this).parents('form');
+
+      // Test on the target first as it's the most likely to be dirty
+      if (isFieldDirty($(evt.target))) {
+        setDirtyStatus($form, true);
+        return;
+      }
+
+      $fields = $form.find(settings.fieldSelector);
+
+      if (settings.addRemoveFieldsMarksDirty) {              
+        // Check if field count has changed
+        var origCount = $form.data("ays-orig-field-count");
+        if (origCount != $fields.length) {
+          setDirtyStatus($form, true);
+          return;
+        }
+      }
+
+      // Brute force - check each field
+      var isDirty = false;
+      $fields.each(function() {
+        $field = $(this);
+        if (isFieldDirty($field)) {
+          isDirty = true;
+          return false; // break
+        }
+      });
+      
+      setDirtyStatus($form, isDirty);
+    };
+
+    var initForm = function($form) {
+      var fields = $form.find(settings.fieldSelector);
+      $(fields).each(function() { storeOrigValue($(this)); });
+      $(fields).unbind(settings.fieldEvents, checkForm);
+      $(fields).bind(settings.fieldEvents, checkForm);
+      $form.data("ays-orig-field-count", $(fields).length);
+      setDirtyStatus($form, false);
+    };
+
+    var setDirtyStatus = function($form, isDirty) {
+      var changed = isDirty != $form.hasClass(settings.dirtyClass);
+      $form.toggleClass(settings.dirtyClass, isDirty);
+        
+      // Fire change event if required
+      if (changed) {
+        if (settings.change) settings.change.call($form, $form);
+
+        if (isDirty) $form.trigger('dirty.areYouSure', [$form]);
+        if (!isDirty) $form.trigger('clean.areYouSure', [$form]);
+        $form.trigger('change.areYouSure', [$form]);
+      }
+    };
+
+    var rescan = function() {
+      var $form = $(this);
+      var fields = $form.find(settings.fieldSelector);
+      $(fields).each(function() {
+        var $field = $(this);
+        if (!$field.data('ays-orig')) {
+          storeOrigValue($field);
+          $field.bind(settings.fieldEvents, checkForm);
+        }
+      });
+      // Check for changes while we're here
+      $form.trigger('checkform.areYouSure');
+    };
+
+    var reinitialize = function() {
+      initForm($(this));
+    }
+
+    if (!settings.silent && !window.aysUnloadSet) {
+      window.aysUnloadSet = true;
+      $(window).bind('beforeunload', function() {
+        $dirtyForms = $("form").filter('.' + settings.dirtyClass);
+        if ($dirtyForms.length == 0) {
+          return;
+        }
+        // Prevent multiple prompts - seen on Chrome and IE
+        if (navigator.userAgent.toLowerCase().match(/msie|chrome/)) {
+          if (window.aysHasPrompted) {
+            return;
+          }
+          window.aysHasPrompted = true;
+          window.setTimeout(function() {window.aysHasPrompted = false;}, 900);
+        }
+        return settings.message;
+      });
+    }
+
+    return this.each(function(elem) {
+      if (!$(this).is('form')) {
+        return;
+      }
+      var $form = $(this);
+        
+      $form.submit(function() {
+        $form.removeClass(settings.dirtyClass);
+      });
+      $form.bind('reset', function() { setDirtyStatus($form, false); });
+      // Add a custom events
+      $form.bind('rescan.areYouSure', rescan);
+      $form.bind('reinitialize.areYouSure', reinitialize);
+      $form.bind('checkform.areYouSure', checkForm);
+      initForm($form);
+    });
+  };
+})(jQuery);