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Task-12: Build a new Form
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name: Lotus | |
description: Build a basic form. | |
type: module | |
core: 8.x |
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lotus.simple_form: | |
path: '/simple-form' | |
defaults: | |
_form: '\Drupal\lotus\Form\SimpleForm' | |
_title: 'Simple Form Example' | |
requirements: | |
_permission: 'access content' |
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<?php | |
namespace Drupal\lotus\Form; | |
use Drupal\Core\Form\FormBase; | |
use Drupal\Core\Form\FormStateInterface; | |
/** | |
* Implements a simple form. | |
*/ | |
class SimpleForm extends FormBase { | |
/** | |
* Build the simple form. | |
* | |
* @param array $form | |
* Default form array structure. | |
* @param FormStateInterface $form_state | |
* Object containing current form state. | |
*/ | |
public function buildForm(array $form, FormStateInterface $form_state) { | |
$form['title'] = [ | |
'#type' => 'textfield', | |
'#title' => $this->t('Title'), | |
'#description' => $this->t('Title must be at least 15 characters in length.'), | |
'#required' => TRUE, | |
]; | |
// Group submit handlers in an actions element with a key of "actions" so | |
// that it gets styled correctly, and so that other modules may add actions | |
// to the form. This is not required, but is convention. | |
$form['actions'] = [ | |
'#type' => 'actions', | |
]; | |
// Add a submit button that handles the submission of the form. | |
$form['actions']['submit'] = [ | |
'#type' => 'submit', | |
'#value' => $this->t('Submit'), | |
]; | |
return $form; | |
} | |
/** | |
* Getter method for Form ID. | |
* | |
* The form ID is used in implementations of hook_form_alter() to allow other | |
* modules to alter the render array built by this form controller. it must | |
* be unique site wide. It normally starts with the providing module's name. | |
* | |
* @return string | |
* The unique ID of the form defined by this class. | |
*/ | |
public function getFormId() { | |
return 'lotus_simple_form'; | |
} | |
/** | |
* Implements form validation. | |
* | |
* The validateForm method is the default method called to validate input on | |
* a form. | |
* | |
* @param array $form | |
* The render array of the currently built form. | |
* @param FormStateInterface $form_state | |
* Object describing the current state of the form. | |
*/ | |
public function validateForm(array &$form, FormStateInterface $form_state) { | |
$title = $form_state->getValue('title'); | |
if (strlen($title) < 15) { | |
// Set an error for the form element with a key of "title". | |
$form_state->setErrorByName('title', $this->t('The title must be at least 15 characters long.')); | |
} | |
} | |
/** | |
* Implements a form submit handler. | |
* | |
* The submitForm method is the default method called for any submit elements. | |
* | |
* @param array $form | |
* The render array of the currently built form. | |
* @param FormStateInterface $form_state | |
* Object describing the current state of the form. | |
*/ | |
public function submitForm(array &$form, FormStateInterface $form_state) { | |
/* | |
* This would normally be replaced by code that actually does something | |
* with the title. | |
*/ | |
$title = $form_state->getValue('title'); | |
drupal_set_message($this->t('You specified a title of %title.', ['%title' => $title])); | |
} | |
} |
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