Implement required fields in a simple way

Author: jissereitsma

Form/Field/Field.php

@@ -67,7 +67,13 @@ public function getBlock(): AbstractBlock
 
     public function getFieldAttributes(): array
     {
-        return (array)$this->getData('field_attributes');
+        $fieldAttributes = (array)$this->getData('field_attributes');
+
+        if ($this->isRequired()) {
+            $fieldAttributes['required'] = null;
+        }
+
+        return $fieldAttributes;
     }
 
     public function getLabelAttributes(): array

view/adminhtml/templates/form/field.phtml

@@ -44,6 +44,9 @@ if (!empty($depends)) {
     <div class="admin__field-label">
         <label for="<?= $escaper->escapeHtml($field->getCode()) ?>">
             <span><?= $escaper->escapeHtml($field->getLabel()) ?></span>
+            <?php if ($field->isRequired()): ?>
+                <span style="color:red">*</span>
+            <?php endif; ?>
         </label>
     </div>
 

view/adminhtml/templates/form/field_type/input.phtml

@@ -30,7 +30,11 @@ if (isset($fieldAttributes['type'])) {
     name="<?= $escaper->escapeHtml($field->getCode()) ?>"
     data-name="<?= $escaper->escapeHtml($field->getCode()) ?>"
     <?php foreach ($fieldAttributes as $attributeName => $attributeValue) : ?>
-        <?= /* @noEscape */ $attributeName ?>="<?= /* @noEscape */ $attributeValue ?>"
+        <?php if ($attributeValue === null): ?>
+            <?= /* @noEscape */ $attributeName ?>
+        <?php else: ?>
+            <?= /* @noEscape */ $attributeName ?>="<?= /* @noEscape */ $attributeValue ?>"
+        <?php endif; ?>
     <?php endforeach; ?>
     :value="<?= $escaper->escapeHtml($field->getScope()) ?>.<?= $escaper->escapeHtml($field->getCode()) ?>"
     @change="<?= $escaper->escapeHtml($field->getAlpineSetter()) ?>"