Pass the field name to the controller task

themes/grav/app/forms/fields/parents.js

@@ -120,7 +120,8 @@ export class Parents {
             url: `${gravConfig.base_url_relative}/ajax.json/task${gravConfig.param_sep}getFolderListing`,
             method: 'post',
             data: {
-                route: b64_encode_unicode(parent.value)
+                route: b64_encode_unicode(parent.value),
+                field: this.field.data('fieldName')
             },
             success: (response) => {
                 this.stopLoader();
@@ -182,6 +183,7 @@ $(document).on('click', '[data-field-parents]', (event) => {
         method: 'post',
         data: {
             route: b64_encode_unicode(field.val()),
+            field: field.data('fieldName'),
             initial: true
         },
         success(response) {

themes/grav/templates/forms/fields/parents/parents.html.twig

@@ -18,7 +18,7 @@
             <span><i class="fa fa-folder-o"></i> <span data-parents-field-label="{{ name }}">{{ value|default('<root>') }}</span></span>
         </div>
 
-        <input type="hidden" class="input" name="{{ name }}" value="{{ value|join(', ') }}" />
+        <input type="hidden" class="input" name="{{ name }}" data-field-name="{{ field.name }}" value="{{ value|join(', ') }}" />
     </div>
 
     {#{% set last_page_route = admin.page.getLastPageRoute %}