From d12196a7b12662aea752e84404834a9641571875 Mon Sep 17 00:00:00 2001
From: Luca Benati <webbati@gmail.com>
Date: Sat, 16 Aug 2025 16:16:12 +0200
Subject: [PATCH 1/2] Set allowClear option if class is found

Set allowClear option to false if element has class 'select-no-clearable'
---
 modules/system/assets/ui/js/select.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/modules/system/assets/ui/js/select.js b/modules/system/assets/ui/js/select.js
index bd2718a53a..3f5cae94ee 100644
--- a/modules/system/assets/ui/js/select.js
+++ b/modules/system/assets/ui/js/select.js
@@ -173,6 +173,10 @@
                 extraOptions.allowClear = true
             }
 
+            if ($element.hasClass('select-no-clearable')) {
+                extraOptions.allowClear = false
+            }
+
             $element.select2($.extend({}, selectOptions, extraOptions))
         })
     })

From 6dbdf3cc54ce9bacd53d1444c5ba7eb98213f7ee Mon Sep 17 00:00:00 2001
From: Luca Benati <webbati@gmail.com>
Date: Sat, 16 Aug 2025 16:20:34 +0200
Subject: [PATCH 2/2] Add allowClear option to disable it on dropdown

---
 modules/backend/widgets/form/partials/_field_dropdown.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules/backend/widgets/form/partials/_field_dropdown.php b/modules/backend/widgets/form/partials/_field_dropdown.php
index eecb194ed7..d32a341074 100644
--- a/modules/backend/widgets/form/partials/_field_dropdown.php
+++ b/modules/backend/widgets/form/partials/_field_dropdown.php
@@ -3,6 +3,7 @@
 $useSearch = $field->getConfig('showSearch', true);
 $emptyOption = $field->getConfig('emptyOption', $field->placeholder);
 $allowCustom = $field->getConfig('allowCustom', false);
+$allowClear = $field->getConfig('allowClear', true);
 ?>
 
 <!-- Dropdown -->
@@ -15,7 +16,7 @@
     <select
         id="<?= $field->getId() ?>"
         name="<?= $field->getName() ?>"
-        class="form-control custom-select <?= $useSearch ? '' : 'select-no-search' ?> <?= $allowCustom ? 'select-modifiable' : '' ?>"
+        class="form-control custom-select <?= $useSearch ? '' : 'select-no-search' ?> <?= $allowCustom ? 'select-modifiable' : '' ?> <?= !$allowClear ? 'select-no-clearable' : '' ?>"
         <?= $field->getAttributes() ?>
         <?= $field->placeholder ? 'data-placeholder="'.e(trans($field->placeholder)).'"' : '' ?>
         >