BUG Add flag on form whether to notify user when there's unsaved changes

src/Forms/Form.php

@@ -262,6 +262,11 @@ class Form extends ViewableData implements HasRequestHandler
      */
     protected $securityTokenAdded = false;
 
+    /**
+     * @var bool
+     */
+    protected $notifyUnsavedChanges = false;
+
     /**
      * Create a new form, with the given fields an action buttons.
      *
@@ -309,6 +314,22 @@ class Form extends ViewableData implements HasRequestHandler
         $this->setupDefaultClasses();
     }
 
+    /**
+     * @return bool
+     */
+    public function getNotifyUnsavedChanges()
+    {
+        return $this->notifyUnsavedChanges;
+    }
+
+    /**
+     * @param bool
+     */
+    public function setNotifyUnsavedChanges($flag)
+    {
+        $this->notifyUnsavedChanges = $flag;
+    }
+
     /**
      * Load form state from session state
      *

src/Forms/Schema/FormSchema.php

@@ -127,6 +127,7 @@ class FormSchema
             'id' => $form->FormName(),
             'fields' => [],
             'messages' => [],
+            'notifyUnsavedChanges' => $form->getNotifyUnsavedChanges(),
         ];
 
         // flattened nested fields are returned, rather than only top level fields.

tests/php/Forms/FormSchemaTest.php

@@ -55,6 +55,7 @@ class FormSchemaTest extends SapphireTest
                 ]
             ],
             'messages' => [],
+            'notifyUnsavedChanges' => false
         ];
 
         $state = $formSchema->getState($form);
@@ -84,6 +85,7 @@ class FormSchemaTest extends SapphireTest
                 'value' => 'All saved',
                 'type' => 'good'
             ]],
+            'notifyUnsavedChanges' => false
         ];
 
         $state = $formSchema->getState($form);
@@ -126,7 +128,8 @@ class FormSchemaTest extends SapphireTest
                     'name' => 'SecurityID',
                 ]
             ],
-            'messages' => []
+            'messages' => [],
+            'notifyUnsavedChanges' => false
         ];
 
         $state = $formSchema->getState($form);