Version 1

[yaffs-website] / web / core / lib / Drupal / Core / Render / Element / Hidden.php

diff --git a/web/core/lib/Drupal/Core/Render/Element/Hidden.php b/web/core/lib/Drupal/Core/Render/Element/Hidden.php
new file mode 100644 (file)
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+++ b/web/core/lib/Drupal/Core/Render/Element/Hidden.php
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+<?php
+
+namespace Drupal\Core\Render\Element;
+
+use Drupal\Core\Render\Element;
+
+/**
+ * Provides a form element for an HTML 'hidden' input element.
+ *
+ * Specify either #default_value or #value but not both.
+ *
+ * Properties:
+ * - #default_value: The initial value of the form element. JavaScript may
+ *   alter the value prior to submission.
+ * - #value: The value of the form element. The Form API ensures that this
+ *   value remains unchanged by the browser.
+ *
+ * Usage example:
+ * @code
+ * $form['entity_id'] = array('#type' => 'hidden', '#value' => $entity_id);
+ * @endcode
+ *
+ * @see \Drupal\Core\Render\Element\Value
+ *
+ * @FormElement("hidden")
+ */
+class Hidden extends FormElement {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getInfo() {
+    $class = get_class($this);
+    return [
+      '#input' => TRUE,
+      '#process' => [
+        [$class, 'processAjaxForm'],
+      ],
+      '#pre_render' => [
+        [$class, 'preRenderHidden'],
+      ],
+      '#theme' => 'input__hidden',
+    ];
+  }
+
+  /**
+   * Prepares a #type 'hidden' render element for input.html.twig.
+   *
+   * @param array $element
+   *   An associative array containing the properties of the element.
+   *   Properties used: #name, #value, #attributes.
+   *
+   * @return array
+   *   The $element with prepared variables ready for input.html.twig.
+   */
+  public static function preRenderHidden($element) {
+    $element['#attributes']['type'] = 'hidden';
+    Element::setAttributes($element, ['name', 'value']);
+
+    return $element;
+  }
+
+}