public function AjaxAddMore::buildForm in Examples for Developers 3.x
Same name and namespace in other branches
- 8 form_api_example/src/Form/AjaxAddMore.php \Drupal\form_api_example\Form\AjaxAddMore::buildForm()
Form with 'add more' and 'remove' buttons.
This example shows a button to "add more" - add another textfield, and the corresponding "remove" button.
Overrides FormInterface::buildForm
File
- modules/
form_api_example/ src/ Form/ AjaxAddMore.php, line 24
Class
- AjaxAddMore
- Implements the ajax demo form controller.
Namespace
Drupal\form_api_example\FormCode
public function buildForm(array $form, FormStateInterface $form_state) {
$form['description'] = [
'#type' => 'item',
'#markup' => $this
->t('This example shows an add-more and a remove-last button.'),
];
// Gather the number of names in the form already.
$num_names = $form_state
->get('num_names');
// We have to ensure that there is at least one name field.
if ($num_names === NULL) {
$name_field = $form_state
->set('num_names', 1);
$num_names = 1;
}
$form['#tree'] = TRUE;
$form['names_fieldset'] = [
'#type' => 'fieldset',
'#title' => $this
->t('People coming to picnic'),
'#prefix' => '<div id="names-fieldset-wrapper">',
'#suffix' => '</div>',
];
for ($i = 0; $i < $num_names; $i++) {
$form['names_fieldset']['name'][$i] = [
'#type' => 'textfield',
'#title' => $this
->t('Name'),
];
}
$form['names_fieldset']['actions'] = [
'#type' => 'actions',
];
$form['names_fieldset']['actions']['add_name'] = [
'#type' => 'submit',
'#value' => $this
->t('Add one more'),
'#submit' => [
'::addOne',
],
'#ajax' => [
'callback' => '::addmoreCallback',
'wrapper' => 'names-fieldset-wrapper',
],
];
// If there is more than one name, add the remove button.
if ($num_names > 1) {
$form['names_fieldset']['actions']['remove_name'] = [
'#type' => 'submit',
'#value' => $this
->t('Remove one'),
'#submit' => [
'::removeCallback',
],
'#ajax' => [
'callback' => '::addmoreCallback',
'wrapper' => 'names-fieldset-wrapper',
],
];
}
$form['actions']['submit'] = [
'#type' => 'submit',
'#value' => $this
->t('Submit'),
];
return $form;
}