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- <?php
- 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);
- }
- }
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