public static function Range::valueCallback

public static Range::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/Range.php, line 70

Class

Range

Provides a slider for input of a number within a specific range.

Namespace

Drupal\Core\Render\Element

Code

public static function valueCallback(&$element, $input, FormStateInterface $form_state) {
  if ($input === '') {
    $offset = ($element['#max'] - $element['#min']) / 2;

    // Round to the step.
    if (strtolower($element['#step']) != 'any') {
      $steps = round($offset / $element['#step']);
      $offset = $element['#step'] * $steps;
    }

    return $element['#min'] + $offset;
  }
}