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<?php
namespace Drupal\Core\Render\Element;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Render\Element;
use Drupal\Component\Utility\Number as NumberUtility;
/**
* Provides a form element for numeric input, with special numeric validation.
*
* Properties:
* - #default_value: A valid floating point number.
* - #min: Minimum value.
* - #max: Maximum value.
* - #step: Ensures that the number is an even multiple of step, offset by #min
* if specified. A #min of 1 and a #step of 2 would allow values of 1, 3, 5,
* etc.
* - #size: The size of the input element in characters.
*
* Usage example:
* @code
* $form['quantity'] = array(
* '#type' => 'number',
* '#title' => $this->t('Quantity'),
* );
* @endcode
*
* @see \Drupal\Core\Render\Element\Range
* @see \Drupal\Core\Render\Element\Textfield
*
* @FormElement("number")
*/
class Number extends FormElement {
/**
* {@inheritdoc}
*/
public function getInfo() {
$class = get_class($this);
return [
'#input' => TRUE,
'#step' => 1,
'#process' => [
[$class, 'processAjaxForm'],
],
'#element_validate' => [
[$class, 'validateNumber'],
],
'#pre_render' => [
[$class, 'preRenderNumber'],
],
'#theme' => 'input__number',
'#theme_wrappers' => ['form_element'],
];
}
/**
* Form element validation handler for #type 'number'.
*
* Note that #required is validated by _form_validate() already.
*/
public static function validateNumber(&$element, FormStateInterface $form_state, &$complete_form) {
$value = $element['#value'];
if ($value === '') {
return;
}
$name = empty($element['#title']) ? $element['#parents'][0] : $element['#title'];
// Ensure the input is numeric.
if (!is_numeric($value)) {
$form_state->setError($element, t('%name must be a number.', ['%name' => $name]));
return;
}
// Ensure that the input is greater than the #min property, if set.
if (isset($element['#min']) && $value < $element['#min']) {
$form_state->setError($element, t('%name must be higher than or equal to %min.', ['%name' => $name, '%min' => $element['#min']]));
}
// Ensure that the input is less than the #max property, if set.
if (isset($element['#max']) && $value > $element['#max']) {
$form_state->setError($element, t('%name must be lower than or equal to %max.', ['%name' => $name, '%max' => $element['#max']]));
}
if (isset($element['#step']) && strtolower($element['#step']) != 'any') {
// Check that the input is an allowed multiple of #step (offset by #min if
// #min is set).
$offset = isset($element['#min']) ? $element['#min'] : 0.0;
if (!NumberUtility::validStep($value, $element['#step'], $offset)) {
$form_state->setError($element, t('%name is not a valid number.', ['%name' => $name]));
}
}
}
/**
* Prepares a #type 'number' render element for input.html.twig.
*
* @param array $element
* An associative array containing the properties of the element.
* Properties used: #title, #value, #description, #min, #max, #placeholder,
* #required, #attributes, #step, #size.
*
* @return array
* The $element with prepared variables ready for input.html.twig.
*/
public static function preRenderNumber($element) {
$element['#attributes']['type'] = 'number';
Element::setAttributes($element, ['id', 'name', 'value', 'step', 'min', 'max', 'placeholder', 'size']);
static::setAttributes($element, ['form-number']);
return $element;
}
}