Fixed Dropdown/Selectize bugs

Fixes #12880

CHANGELOG.md

@@ -9,6 +9,8 @@
 - Fixed a bug where multi-value field inputs would be considered modified even if they weren’t, if the field type’s `isValueEmpty()` method returned `true`. ([#12858](https://github.com/craftcms/cms/issues/12858))
 - Fixed a bug where asset thumbnails within secondary slideout tabs weren’t loading immediately. ([#12859](https://github.com/craftcms/cms/issues/12859))
 - Fixed a bug where rebuilding the project config would lose track of image transforms’ `fill` and `upscale` settings. ([#12879](https://github.com/craftcms/cms/issues/12879))
+- Fixed a bug where blank Dropdown options weren’t showing up in the Selectize menu. ([#12880](https://github.com/craftcms/cms/issues/12880))
+- Fixed a bug where it was possible to save a Dropdown field without a value, even if the field didn’t have any blank options. ([#12880](https://github.com/craftcms/cms/issues/12880))
 - Added `craft\models\ImageTransform::getConfig()`.
 
 ## 4.4.1 - 2023-03-09

src/fields/BaseOptionsField.php

@@ -399,7 +399,13 @@ public function getElementValidationRules(): array
         }
 
         return [
-            ['in', 'range' => $range, 'allowArray' => $this->multi],
+            [
+                'in',
+                'range' => $range,
+                'allowArray' => $this->multi,
+                // Don't allow saving invalid blank values via Selectize
+                'skipOnEmpty' => !($this instanceof Dropdown && Craft::$app->getRequest()->getIsCpRequest()),
+            ],
         ];
     }
 

src/fields/Dropdown.php

@@ -51,14 +51,16 @@ protected function inputHtml(mixed $value, ?ElementInterface $element = null): s
         /** @var SingleOptionFieldData $value */
         $options = $this->translatedOptions(true, $value, $element);
 
+        $hasBlankOption = ArrayHelper::contains($options, function($option) {
+            return isset($option['value']) && $option['value'] === '';
+        });
+
         if (!$value->valid) {
             Craft::$app->getView()->setInitialDeltaValue($this->handle, $this->encodeValue($value->value));
             $value = null;
 
             // Add a blank option to the beginning if one doesn't already exist
-            if (!ArrayHelper::contains($options, function($option) {
-                return isset($option['value']) && $option['value'] === '';
-            })) {
+            if (!$hasBlankOption) {
                 array_unshift($options, ['label' => '', 'value' => '']);
             }
         }
@@ -69,6 +71,9 @@ protected function inputHtml(mixed $value, ?ElementInterface $element = null): s
             'name' => $this->handle,
             'value' => $this->encodeValue($value),
             'options' => $options,
+            'selectizeOptions' => [
+                'allowEmptyOption' => $hasBlankOption,
+            ],
         ]);
     }