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| <?php | |
| /** | |
| * @file | |
| * Contains \Drupal\Core\Template\AttributeBoolean. | |
| */ | |
| namespace Drupal\Core\Template; | |
| use Drupal\Component\Utility\Html; | |
| /** | |
| * A class that defines a type of boolean HTML attribute. | |
| * | |
| * Boolean HTML attributes are not attributes with values of TRUE/FALSE. | |
| * They are attributes that if they exist in the tag, they are TRUE. | |
| * Examples include selected, disabled, checked, readonly. | |
| * | |
| * To set a boolean attribute on the Attribute class, set it to TRUE. | |
| * @code | |
| * $attributes = new Attribute(); | |
| * $attributes['disabled'] = TRUE; | |
| * echo '<select' . $attributes . '/>'; | |
| * // produces <select disabled>; | |
| * $attributes['disabled'] = FALSE; | |
| * echo '<select' . $attributes . '/>'; | |
| * // produces <select>; | |
| * @endcode | |
| * | |
| * @see \Drupal\Core\Template\Attribute | |
| */ | |
| class AttributeBoolean extends AttributeValueBase { | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function render() { | |
| return $this->__toString(); | |
| } | |
| /** | |
| * Implements the magic __toString() method. | |
| */ | |
| public function __toString() { | |
| return $this->value === FALSE ? '' : Html::escape($this->name); | |
| } | |
| } |