public static Select::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 $form_state: The current state of the form.
Return value
mixed The value to assign to the element.
Overrides FormElement::valueCallback
File
- core/lib/Drupal/Core/Render/Element/Select.php, line 139
Class
- Select
- Provides a form element for a drop-down menu or scrolling selection box.
Namespace
Drupal\Core\Render\Element
Code
public static function valueCallback(&$element, $input, FormStateInterface $form_state) {
if ($input !== FALSE) {
if (isset($element['#multiple']) && $element['#multiple']) {
// If an enabled multi-select submits NULL, it means all items are
// unselected. A disabled multi-select always submits NULL, and the
// default value should be used.
if (empty($element['#disabled'])) {
return (is_array($input)) ? array_combine($input, $input) : array();
}
else {
return (isset($element['#default_value']) && is_array($element['#default_value'])) ? $element['#default_value'] : array();
}
}
// Non-multiple select elements may have an empty option prepended to them
// (see \Drupal\Core\Render\Element\Select::processSelect()). When this
// occurs, usually #empty_value is an empty string, but some forms set
// #empty_value to integer 0 or some other non-string constant. PHP
// receives all submitted form input as strings, but if the empty option
// is selected, set the value to match the empty value exactly.
elseif (isset($element['#empty_value']) && $input === (string) $element['#empty_value']) {
return $element['#empty_value'];
}
else {
return $input;
}
}
}
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