class Autotextfields
Same name in other branches
- 4.0.x modules/ajax_example/src/Form/Autotextfields.php \Drupal\ajax_example\Form\Autotextfields
Show textfields based on AJAX-enabled checkbox clicks.
Hierarchy
- class \Drupal\Core\Form\FormBase implements \Drupal\Core\Form\FormInterface, \Drupal\Core\DependencyInjection\ContainerInjectionInterface uses \Drupal\Core\DependencyInjection\DependencySerializationTrait, \Drupal\Core\Logger\LoggerChannelTrait, \Drupal\Core\Messenger\MessengerTrait, \Drupal\Core\Routing\RedirectDestinationTrait, \Drupal\Core\StringTranslation\StringTranslationTrait
- class \Drupal\ajax_example\Form\Autotextfields extends \Drupal\Core\Form\FormBase
Expanded class hierarchy of Autotextfields
Related topics
1 string reference to 'Autotextfields'
- ajax_example.routing.yml in modules/
ajax_example/ ajax_example.routing.yml - modules/ajax_example/ajax_example.routing.yml
File
-
modules/
ajax_example/ src/ Form/ Autotextfields.php, line 13
Namespace
Drupal\ajax_example\FormView source
class Autotextfields extends FormBase {
/**
* {@inheritdoc}
*/
public function getFormId() {
return 'ajax_example_autotextfields';
}
/**
* {@inheritdoc}
*
* This form has two checkboxes which the user can check in order to then
* reveal the first and/or last name text fields.
*
* We could perform this behavior with #states. We might not want to if, for
* instance, we wanted to require a name, but let the user choose whether
* to enter first or last or both.
*
* For all the requests this class gets, the buildForm() method will always be
* called. If an AJAX request comes in, the form state will be set to the
* state the user changed that caused the AJAX request. So if the user enabled
* one of our checkboxes, it will be checked in $form_state.
*/
public function buildForm(array $form, FormStateInterface $form_state) {
$form['description'] = [
'#type' => 'item',
'#markup' => $this->t('This form demonstrates changing the status of form elements through AJAX requests.'),
];
$form['ask_first_name'] = [
'#type' => 'checkbox',
'#title' => $this->t('Ask me my first name'),
'#ajax' => [
'callback' => '::textfieldsCallback',
'wrapper' => 'textfields-container',
'effect' => 'fade',
],
];
$form['ask_last_name'] = [
'#type' => 'checkbox',
'#title' => $this->t('Ask me my last name'),
'#ajax' => [
'callback' => '::textfieldsCallback',
'wrapper' => 'textfields-container',
'effect' => 'fade',
],
];
// Wrap textfields in a container. This container will be replaced through
// AJAX.
$form['textfields_container'] = [
'#type' => 'container',
'#attributes' => [
'id' => 'textfields-container',
],
];
$form['textfields_container']['textfields'] = [
'#type' => 'fieldset',
'#title' => $this->t("Generated text fields for first and last name"),
'#description' => $this->t('This is where we put automatically generated textfields'),
];
// This form is rebuilt on all requests, so whether or not the request comes
// from AJAX, we should rebuild everything based on the form state.
// Checkbox values are expressed as 1 or 0, so we have to be sure to compare
// type as well as value.
if ($form_state->getValue('ask_first_name', NULL) === 1) {
$form['textfields_container']['textfields']['first_name'] = [
'#type' => 'textfield',
'#title' => $this->t('First Name'),
'#required' => TRUE,
];
}
if ($form_state->getValue('ask_last_name', NULL) === 1) {
$form['textfields_container']['textfields']['last_name'] = [
'#type' => 'textfield',
'#title' => $this->t('Last Name'),
'#required' => TRUE,
];
}
$form['textfields_container']['submit'] = [
'#type' => 'submit',
'#value' => $this->t('Click Me'),
];
return $form;
}
/**
* {@inheritdoc}
*/
public function submitForm(array &$form, FormStateInterface $form_state) {
$this->messenger()
->addMessage($this->t('Submit handler: First name: @first_name Last name: @last_name', [
'@first_name' => $form_state->getValue('first_name', 'n/a'),
'@last_name' => $form_state->getValue('last_name', 'n/a'),
]));
}
/**
* Callback for ajax_example_autotextfields.
*
* Selects the piece of the form we want to use as replacement markup and
* returns it as a form (renderable array).
*/
public function textfieldsCallback($form, FormStateInterface $form_state) {
return $form['textfields_container'];
}
}
Members
Title Sort descending | Modifiers | Object type | Summary | Overriden Title | Overrides |
---|---|---|---|---|---|
Autotextfields::buildForm | public | function | This form has two checkboxes which the user can check in order to then reveal the first and/or last name text fields. |
Overrides FormInterface::buildForm | |
Autotextfields::getFormId | public | function | Returns a unique string identifying the form. | Overrides FormInterface::getFormId | |
Autotextfields::submitForm | public | function | Form submission handler. | Overrides FormInterface::submitForm | |
Autotextfields::textfieldsCallback | public | function | Callback for ajax_example_autotextfields. | ||
DependencySerializationTrait::$_entityStorages | protected | property | |||
DependencySerializationTrait::$_serviceIds | protected | property | |||
DependencySerializationTrait::__sleep | public | function | 1 | ||
DependencySerializationTrait::__wakeup | public | function | 2 | ||
FormBase::$configFactory | protected | property | The config factory. | 3 | |
FormBase::$requestStack | protected | property | The request stack. | 1 | |
FormBase::$routeMatch | protected | property | The route match. | ||
FormBase::config | protected | function | Retrieves a configuration object. | ||
FormBase::configFactory | protected | function | Gets the config factory for this form. | 3 | |
FormBase::container | private | function | Returns the service container. | ||
FormBase::create | public static | function | Instantiates a new instance of this class. | Overrides ContainerInjectionInterface::create | 105 |
FormBase::currentUser | protected | function | Gets the current user. | ||
FormBase::getRequest | protected | function | Gets the request object. | ||
FormBase::getRouteMatch | protected | function | Gets the route match. | ||
FormBase::logger | protected | function | Gets the logger for a specific channel. | ||
FormBase::redirect | protected | function | Returns a redirect response object for the specified route. | ||
FormBase::resetConfigFactory | public | function | Resets the configuration factory. | ||
FormBase::setConfigFactory | public | function | Sets the config factory for this form. | ||
FormBase::setRequestStack | public | function | Sets the request stack object to use. | ||
FormBase::validateForm | public | function | Form validation handler. | Overrides FormInterface::validateForm | 73 |
LoggerChannelTrait::$loggerFactory | protected | property | The logger channel factory service. | ||
LoggerChannelTrait::getLogger | protected | function | Gets the logger for a specific channel. | ||
LoggerChannelTrait::setLoggerFactory | public | function | Injects the logger channel factory. | ||
MessengerTrait::$messenger | protected | property | The messenger. | 17 | |
MessengerTrait::messenger | public | function | Gets the messenger. | 17 | |
MessengerTrait::setMessenger | public | function | Sets the messenger. | ||
RedirectDestinationTrait::$redirectDestination | protected | property | The redirect destination service. | 1 | |
RedirectDestinationTrait::getDestinationArray | protected | function | Prepares a 'destination' URL query parameter for use with \Drupal\Core\Url. | ||
RedirectDestinationTrait::getRedirectDestination | protected | function | Returns the redirect destination service. | ||
RedirectDestinationTrait::setRedirectDestination | public | function | Sets the redirect destination service. | ||
StringTranslationTrait::$stringTranslation | protected | property | The string translation service. | 3 | |
StringTranslationTrait::formatPlural | protected | function | Formats a string containing a count of items. | ||
StringTranslationTrait::getNumberOfPlurals | protected | function | Returns the number of plurals supported by a given language. | ||
StringTranslationTrait::getStringTranslation | protected | function | Gets the string translation service. | ||
StringTranslationTrait::setStringTranslation | public | function | Sets the string translation service to use. | 2 | |
StringTranslationTrait::t | protected | function | Translates a string to the current language or to a given language. |