Version 1

[yaffs-website] / web / core / modules / system / tests / modules / form_test / src / Form / FormTestRebuildPreserveValuesForm.php

diff --git a/web/core/modules/system/tests/modules/form_test/src/Form/FormTestRebuildPreserveValuesForm.php b/web/core/modules/system/tests/modules/form_test/src/Form/FormTestRebuildPreserveValuesForm.php
new file mode 100644 (file)
index 0000000..58934a7
--- /dev/null
+++ b/web/core/modules/system/tests/modules/form_test/src/Form/FormTestRebuildPreserveValuesForm.php
@@ -0,0 +1,98 @@
+<?php
+
+namespace Drupal\form_test\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Form builder for testing preservation of values during a rebuild.
+ */
+class FormTestRebuildPreserveValuesForm extends FormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'form_test_form_rebuild_preserve_values_form';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    // Start the form with two checkboxes, to test different defaults, and a
+    // textfield, to test more than one element type.
+    $form = [
+      'checkbox_1_default_off' => [
+        '#type' => 'checkbox',
+        '#title' => t('This checkbox defaults to unchecked'),
+        '#default_value' => FALSE,
+      ],
+      'checkbox_1_default_on' => [
+        '#type' => 'checkbox',
+        '#title' => t('This checkbox defaults to checked'),
+        '#default_value' => TRUE,
+      ],
+      'text_1' => [
+        '#type' => 'textfield',
+        '#title' => t('This textfield has a non-empty default value.'),
+        '#default_value' => 'DEFAULT 1',
+      ],
+    ];
+    // Provide an 'add more' button that rebuilds the form with an additional two
+    // checkboxes and a textfield. The test is to make sure that the rebuild
+    // triggered by this button preserves the user input values for the initial
+    // elements and initializes the new elements with the correct default values.
+    if (!$form_state->has('add_more')) {
+      $form['add_more'] = [
+        '#type' => 'submit',
+        '#value' => 'Add more',
+        '#submit' => ['::addMoreSubmitForm'],
+      ];
+    }
+    else {
+      $form += [
+        'checkbox_2_default_off' => [
+          '#type' => 'checkbox',
+          '#title' => t('This checkbox defaults to unchecked'),
+          '#default_value' => FALSE,
+        ],
+        'checkbox_2_default_on' => [
+          '#type' => 'checkbox',
+          '#title' => t('This checkbox defaults to checked'),
+          '#default_value' => TRUE,
+        ],
+        'text_2' => [
+          '#type' => 'textfield',
+          '#title' => t('This textfield has a non-empty default value.'),
+          '#default_value' => 'DEFAULT 2',
+        ],
+      ];
+    }
+    // A submit button that finishes the form workflow (does not rebuild).
+    $form['submit'] = [
+      '#type' => 'submit',
+      '#value' => 'Submit',
+    ];
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function addMoreSubmitForm(array &$form, FormStateInterface $form_state) {
+    // Rebuild, to test preservation of input values.
+    $form_state->set('add_more', TRUE);
+    $form_state->setRebuild();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    // Finish the workflow. Do not rebuild.
+    drupal_set_message(t('Form values: %values', ['%values' => var_export($form_state->getValues(), TRUE)]));
+  }
+
+}