diff --git a/src/Bundle/ChillActivityBundle/Resources/views/Activity/editAccompanyingCourse.html.twig b/src/Bundle/ChillActivityBundle/Resources/views/Activity/editAccompanyingCourse.html.twig
index 617e5fa78..a40b1d721 100644
--- a/src/Bundle/ChillActivityBundle/Resources/views/Activity/editAccompanyingCourse.html.twig
+++ b/src/Bundle/ChillActivityBundle/Resources/views/Activity/editAccompanyingCourse.html.twig
@@ -12,8 +12,10 @@
 {% block js %}
     {{ encore_entry_link_tags('async_upload') }}
     <script type="text/javascript">
-        //chill.displayAlertWhenLeavingModifiedForm('form[name="{{ edit_form.vars.form.vars.name }}"]', 
-        //    '{{ "You are going to leave a page with unsubmitted data. Are you sure you want to leave ?"|trans }}');
+        window.addEventListener('DOMContentLoaded', function (e) {
+            chill.displayAlertWhenLeavingModifiedForm('form[name="{{ edit_form.vars.form.vars.name }}"]', 
+            '{{ "You are going to leave a page with unsubmitted data. Are you sure you want to leave ?"|trans }}');
+        });
         window.activity = {{ activity_json|json_encode|raw }}; 
     </script>
     {{ encore_entry_script_tags('vue_activity') }}
diff --git a/src/Bundle/ChillActivityBundle/Resources/views/Activity/editPerson.html.twig b/src/Bundle/ChillActivityBundle/Resources/views/Activity/editPerson.html.twig
index 5f39db090..1022bdd5b 100644
--- a/src/Bundle/ChillActivityBundle/Resources/views/Activity/editPerson.html.twig
+++ b/src/Bundle/ChillActivityBundle/Resources/views/Activity/editPerson.html.twig
@@ -28,8 +28,10 @@
 {% block js %}
     {{ encore_entry_link_tags('async_upload') }}
     <script type="text/javascript">
-        //chill.displayAlertWhenLeavingModifiedForm('form[name="{{ edit_form.vars.form.vars.name }}"]', 
-        //    '{{ "You are going to leave a page with unsubmitted data. Are you sure you want to leave ?"|trans }}');
+        window.addEventListener('DOMContentLoaded', function (e) {
+            chill.displayAlertWhenLeavingModifiedForm('form[name="{{ edit_form.vars.form.vars.name }}"]', 
+            '{{ "You are going to leave a page with unsubmitted data. Are you sure you want to leave ?"|trans }}');
+        });
         window.activity = {{ activity_json|json_encode|raw }};
     </script>
     {{ encore_entry_script_tags('vue_activity') }}
diff --git a/src/Bundle/ChillActivityBundle/Resources/views/Activity/newAccompanyingCourse.html.twig b/src/Bundle/ChillActivityBundle/Resources/views/Activity/newAccompanyingCourse.html.twig
index 75e3fcc81..bcf386ffd 100644
--- a/src/Bundle/ChillActivityBundle/Resources/views/Activity/newAccompanyingCourse.html.twig
+++ b/src/Bundle/ChillActivityBundle/Resources/views/Activity/newAccompanyingCourse.html.twig
@@ -12,8 +12,10 @@
 {% block js %}
     {{ encore_entry_script_tags('async_upload') }}
     <script type="text/javascript">
-        //chill.displayAlertWhenLeavingUnsubmittedForm('form[name="{{ form.vars.form.vars.name }}"]', 
-        //    '{{ "You are going to leave a page with unsubmitted data. Are you sure you want to leave ?"|trans }}');
+        window.addEventListener('DOMContentLoaded', function (e) {
+            chill.displayAlertWhenLeavingUnsubmittedForm('form[name="{{ form.vars.form.vars.name }}"]', 
+            '{{ "You are going to leave a page with unsubmitted data. Are you sure you want to leave ?"|trans }}');
+        });
         window.activity = {{ activity_json|json_encode|raw }}; 
     </script>
     {{ encore_entry_script_tags('vue_activity') }}
diff --git a/src/Bundle/ChillActivityBundle/Resources/views/Activity/newPerson.html.twig b/src/Bundle/ChillActivityBundle/Resources/views/Activity/newPerson.html.twig
index 4205bdbe8..6b1613a90 100644
--- a/src/Bundle/ChillActivityBundle/Resources/views/Activity/newPerson.html.twig
+++ b/src/Bundle/ChillActivityBundle/Resources/views/Activity/newPerson.html.twig
@@ -12,8 +12,10 @@
 {% block js %}
     {{ encore_entry_link_tags('async_upload') }}
     <script type="text/javascript">
-        //chill.displayAlertWhenLeavingUnsubmittedForm('form[name="{{ form.vars.form.vars.name }}"]', 
-        //    '{{ "You are going to leave a page with unsubmitted data. Are you sure you want to leave ?"|trans }}');
+        window.addEventListener('DOMContentLoaded', function (e) {
+            chill.displayAlertWhenLeavingUnsubmittedForm('form[name="{{ form.vars.form.vars.name }}"]', 
+            '{{ "You are going to leave a page with unsubmitted data. Are you sure you want to leave ?"|trans }}');
+        });
         window.activity = {{ activity_json|json_encode|raw }};
     </script>
     {{ encore_entry_script_tags('vue_activity') }}