public static Radios::valueCallback(&$element, $input, FormStateInterface $form_state)
Determines how user input is mapped to an element's #value property.
Parameters
array $element: An associative array containing the properties of the element.
mixed $input: The incoming input to populate the form element. If this is FALSE, the element's default value should be returned.
\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form.
Return value
mixed The value to assign to the element.
Overrides FormElement::valueCallback
File
- core/lib/Drupal/Core/Render/Element/Radios.php, line 93
Class
- Radios
- Provides a form element for a set of radio buttons.
Namespace
Drupal\Core\Render\Element
Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | public static function valueCallback(&$element, $input, FormStateInterface $form_state) { if ($input !== FALSE) { // When there's user input (including NULL), return it as the value. // However, if NULL is submitted, FormBuilder::handleInputElement() will // apply the default value, and we want that validated against #options // unless it's empty. (An empty #default_value, such as NULL or FALSE, can // be used to indicate that no radio button is selected by default.) if (!isset($input) && !empty($element['#default_value'])) { $element['#needs_validation'] = TRUE; } return $input; } else { // For default value handling, simply return #default_value. Additionally, // for a NULL default value, set #has_garbage_value to prevent // FormBuilder::handleInputElement() converting the NULL to an empty // string, so that code can distinguish between nothing selected and the // selection of a radio button whose value is an empty string. $value = isset($element['#default_value']) ? $element['#default_value'] : NULL; if (!isset($value)) { $element['#has_garbage_value'] = TRUE; } return $value; }} |
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