در این اموزش به فرم ها در دروپال ۸ میپردازیم

فرم ها در دروپال 8

ما در این مرحله ماژولی را که نوشه بودیم گسترش میدهیم

ابتدا در روت اصلی ماژول یه پوشه جدید به اسم Form ایجاد میکنیم و در پوشه ایجاد شده فایل به نام CustomForm.php ایجاد میکنیم و در فایل ایجاد شده کد ها را به صورت زیر مینویسیم

<?<?php
namespace Drupal\custom\form;
use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormInterface;
use Drupal\Core\Form\FormStateInterface;

class CustomForm extends FormBase {
}

در اینجا بک namespace برای فرم خودمون تعریف میکنم

و مقادیر FormInterface و FormStateInterface برای این شاخه use میکنیم

در ادامه باید برای این فرم یک form id ایجاد کینم

  /**
   * Returns a unique string identifying the form.
   *
   * The returned ID should be a unique string that can be a valid PHP function
   * name, since it's used in hook implementation names such as
   * hook_form_FORM_ID_alter().
   *
   * @return string
   *   The unique string identifying the form.
   */
  public function getFormId() {
    return 'my_custom_form';
  }

بعد میتوانیم فیلد های خودمون رابه صورت زیر ایجاد کینم

  /**
   * Form constructor.
   *
   * @param array $form
   *   An associative array containing the structure of the form.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   The current state of the form.
   *
   * @return array
   *   The form structure.
   */
  public function buildForm(array $form, FormStateInterface $form_state) {

    $form['description'] = [
      '#type' => 'item',
      '#markup' => $this->t('Please enter the title and accept the terms of use of the site.'),
    ];
    $form['title'] = [
      '#type' => 'textfield',
      '#title' => $this->t('Title'),
      '#description' => $this->t('Enter the title of the book. Note that the title must be at least 10 characters in length.'),
      '#required' => TRUE,
    ];

    $form['accept'] = array(
      '#type' => 'checkbox',
      '#title' => $this
        ->t('I accept the terms of use of the site'),
      '#description' => $this->t('Please read and accept the terms of use'),
    );
    $form['actions'] = [
      '#type' => 'actions',
    ];
    $form['actions']['submit'] = [
      '#type' => 'submit',
      '#value' => $this->t('Submit'),
    ];

    return $form;

  }

برای فرم میتوانیم یک ولیدت ایجاد کنیم

  public function validateForm(array &$form, FormStateInterface $form_state) {
    parent::validateForm($form, $form_state);

    $title = $form_state->getValue('title');
    $accept = $form_state->getValue('accept');

    if (strlen($title) < 10) {
      // Set an error for the form element with a key of "title".
      $form_state->setErrorByName('title', $this->t('The title must be at least 10 characters long.'));
    }

    if (empty($accept)){
      // Set an error for the form element with a key of "accept".
      $form_state->setErrorByName('accept', $this->t('You must accept the terms of use to continue'));
    }

  }

و در انتها مقدار submit را تعریف میکنم

 public function submitForm(array &$form, FormStateInterface $form_state) {
    drupal_set_message($form_state->getValue('title'));
    return;
  }

در نهایت ماژول به صورت زیر خواهد بود

<?php
namespace Drupal\custom\form;
use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormInterface;
use Drupal\Core\Form\FormStateInterface;

class CustomForm extends FormBase {

  /**
   * Returns a unique string identifying the form.
   *
   * The returned ID should be a unique string that can be a valid PHP function
   * name, since it's used in hook implementation names such as
   * hook_form_FORM_ID_alter().
   *
   * @return string
   *   The unique string identifying the form.
   */
  public function getFormId() {
    return 'my_custom_form';
  }
  /**
   * Form constructor.
   *
   * @param array $form
   *   An associative array containing the structure of the form.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   The current state of the form.
   *
   * @return array
   *   The form structure.
   */
  public function buildForm(array $form, FormStateInterface $form_state) {

    $form['description'] = [
      '#type' => 'item',
      '#markup' => $this->t('Please enter the title and accept the terms of use of the site.'),
    ];
    $form['title'] = [
      '#type' => 'textfield',
      '#title' => $this->t('Title'),
      '#description' => $this->t('Enter the title of the book. Note that the title must be at least 10 characters in length.'),
      '#required' => TRUE,
    ];

    $form['accept'] = array(
      '#type' => 'checkbox',
      '#title' => $this
        ->t('I accept the terms of use of the site'),
      '#description' => $this->t('Please read and accept the terms of use'),
    );
    $form['actions'] = [
      '#type' => 'actions',
    ];
    $form['actions']['submit'] = [
      '#type' => 'submit',
      '#value' => $this->t('Submit'),
    ];

    return $form;

  }
  public function validateForm(array &$form, FormStateInterface $form_state) {
    parent::validateForm($form, $form_state);

    $title = $form_state->getValue('title');
    $accept = $form_state->getValue('accept');

    if (strlen($title) < 10) {
      // Set an error for the form element with a key of "title".
      $form_state->setErrorByName('title', $this->t('The title must be at least 10 characters long.'));
    }

    if (empty($accept)){
      // Set an error for the form element with a key of "accept".
      $form_state->setErrorByName('accept', $this->t('You must accept the terms of use to continue'));
    }

  }
  public function submitForm(array &$form, FormStateInterface $form_state) {
    drupal_set_message($form_state->getValue('title'));
    return;
  }
}

میتوانیم یک route جدید برای فرم تعرف کنیم \

mycustom.content:
  path: '/hello'
  defaults:
    _controller: 'Drupal\mycustom\Controller\MycustomController::content'
    _title: 'Hello world'
  requirements:
    _permission: 'my custom permisstion'
mycustom.form:
  path: '/csfrom'
  defaults:
    _form: 'Drupal\mycustom\Form\MycustomForm'
    _title: 'Hello world'
  requirements:
    _permission: 'my custom permisstion'