JsonSchemaFormWidget.php

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<?php
 
namespace Drupal\json_schema_field\Plugin\Field\FieldWidget;
 
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\WidgetBase;
use Drupal\Core\Form\FormStateInterface;
 
class JsonSchemaFormWidget extends WidgetBase {
 
  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
    $value = isset($items[$delta]->value) ? $items[$delta]->value : '';
    ksm($value);
    ksm('y');
    $element += [
      '#type' => 'textfield',
      '#default_value' => $value,
      '#size' => 7,
      '#maxlength' => 7,
      '#element_validate' => [
      [$this, 'validate'],
      ],
    ];
    return ['value' => $element];
  }
 
  public function validate($element, FormStateInterface $form_state) {
    $value = $element['#value'];
    ksm('h');
    ksm($value);
    if (strlen($value) == 0) {
      $form_state->setValueForElement($element, '');
      return;
    }
    if (!preg_match('/^#([a-f0-9]{6})$/iD', strtolower($value))) {
      $form_state->setError($element, $this->t("Color must be a 6-digit hexadecimal value, suitable for CSS."));
    }
  }
 
}