function Radio::preRenderRadio

Prepares a #type 'radio' render element for input.html.twig.

Parameters

array $element: An associative array containing the properties of the element. Properties used: #required, #return_value, #value, #attributes, #title, #description. The #name property will be sanitized before output. This is currently done by initializing Drupal\Core\Template\Attribute with all the attributes.

Return value

array The $element with prepared variables ready for input.html.twig.

File

core/lib/Drupal/Core/Render/Element/Radio.php, line 53

Class

Radio

Provides a form element for a single radio button.

Namespace

Drupal\Core\Render\Element

Code

public static function preRenderRadio($element) {
    $element['#attributes']['type'] = 'radio';
    Element::setAttributes($element, [
        'id',
        'name',
        '#return_value' => 'value',
    ]);
    // To avoid auto-casting during '==' we convert $element['#value'] and
    // $element['#return_value'] to strings. It will prevent wrong true-checking
    // for both cases: 0 == 'string' and 'string' == 0, this will occur because
    // all numeric array values will be integers and all submitted values will
    // be strings. Array values are never valid for radios and are skipped. To
    // account for FALSE and empty string values in the #return_value, we will
    // consider any #value that evaluates to empty to be the same as any
    // #return_value that evaluates to empty.
    if (isset($element['#return_value']) && $element['#value'] !== FALSE && !is_array($element['#value']) && (empty($element['#value']) && empty($element['#return_value']) || (string) $element['#value'] === (string) $element['#return_value'])) {
        $element['#attributes']['checked'] = 'checked';
    }
    static::setAttributes($element, [
        'form-radio',
    ]);
    return $element;
}