'select',
'#options' => ['one' => 'one', 'two' => 'two', 'three' => 'three', 'four' => 'four'],
];
$form['select'] = $base + [
'#title' => '#default_value one',
'#default_value' => 'one',
];
$form['select_required'] = $base + [
'#title' => '#default_value one, #required',
'#required' => TRUE,
'#default_value' => 'one',
];
$form['select_optional'] = $base + [
'#title' => '#default_value one, not #required',
'#required' => FALSE,
'#default_value' => 'one',
];
$form['empty_value'] = $base + [
'#title' => '#default_value one, #required, #empty_value 0',
'#required' => TRUE,
'#default_value' => 'one',
'#empty_value' => 0,
];
$form['empty_value_one'] = $base + [
'#title' => '#default_value = #empty_value, #required',
'#required' => TRUE,
'#default_value' => 'one',
'#empty_value' => 'one',
];
$form['no_default'] = $base + [
'#title' => 'No #default_value, #required',
'#required' => TRUE,
];
$form['no_default_optional'] = $base + [
'#title' => 'No #default_value, not #required',
'#required' => FALSE,
'#description' => 'Should result in "one" because it is not required and there is no #empty_value requested, so default browser behavior of preselecting first option is in effect.',
];
$form['no_default_optional_empty_value'] = $base + [
'#title' => 'No #default_value, not #required, #empty_value empty string',
'#empty_value' => '',
'#required' => FALSE,
'#description' => 'Should result in an empty string (due to #empty_value) because it is optional.',
];
$form['no_default_empty_option'] = $base + [
'#title' => 'No #default_value, #required, #empty_option',
'#required' => TRUE,
'#empty_option' => '- Choose -',
];
$form['no_default_empty_option_optional'] = $base + [
'#title' => 'No #default_value, not #required, #empty_option',
'#empty_option' => '- Dismiss -',
'#description' => 'Should result in an empty string (default of #empty_value) because it is optional.',
];
$form['no_default_empty_value'] = $base + [
'#title' => 'No #default_value, #required, #empty_value 0',
'#required' => TRUE,
'#empty_value' => 0,
'#description' => 'Should never result in 0.',
];
$form['no_default_empty_value_one'] = $base + [
'#title' => 'No #default_value, #required, #empty_value one',
'#required' => TRUE,
'#empty_value' => 'one',
'#description' => 'A mistakenly assigned #empty_value contained in #options should not be valid.',
];
$form['no_default_empty_value_optional'] = $base + [
'#title' => 'No #default_value, not #required, #empty_value 0',
'#required' => FALSE,
'#empty_value' => 0,
'#description' => 'Should result in 0 because it is optional.',
];
$form['multiple'] = $base + [
'#title' => '#multiple, #default_value two',
'#default_value' => ['two'],
'#multiple' => TRUE,
];
$form['multiple_no_default'] = $base + [
'#title' => '#multiple, no #default_value',
'#multiple' => TRUE,
];
$form['multiple_no_default_required'] = $base + [
'#title' => '#multiple, #required, no #default_value',
'#required' => TRUE,
'#multiple' => TRUE,
];
$form['opt_groups'] = [
'#type' => 'select',
'#options' => [
'optgroup_one' => ['one' => 'one', 'two' => 'two', 'three' => 'three', 'four' => 'four'],
'optgroup_two' => ['five' => 'five', 'six' => 'six'],
],
];
$form['submit'] = ['#type' => 'submit', '#value' => 'Submit'];
return $form;
}
/**
* {@inheritdoc}
*/
public function submitForm(array &$form, FormStateInterface $form_state) {
$form_state->setResponse(new JsonResponse($form_state->getValues()));
}
}