class AttributeBoolean

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.

 $attributes = new Attribute();
 $attributes['disabled'] = TRUE;
 echo '<select' . $attributes . '/>';
 // produces <select disabled>;
 $attributes['disabled'] = FALSE;
 echo '<select' . $attributes . '/>';
 // produces <select>;

Hierarchy

• class \Drupal\Core\Template\AttributeValueBase
  • class \Drupal\Core\Template\AttributeBoolean

See also

\Drupal\Core\Template\Attribute

File

core/lib/Drupal/Core/Template/AttributeBoolean.php, line 27

Namespace

Drupal\Core\Template

Members

Name	Modifiers	Type	Description
AttributeBoolean::render	public	function	Returns a string representation of the attribute. Overrides AttributeValueBase::render
AttributeBoolean::__toString	public	function	Implements the magic __toString() method. Overrides AttributeValueBase::__toString
AttributeValueBase::$name	protected	property	The name of the value.
AttributeValueBase::$value	protected	property	The value itself.
AttributeValueBase::RENDER_EMPTY_ATTRIBUTE		constant	Renders '$name=""' if $value is an empty string.
AttributeValueBase::value	public	function	Returns the raw value.
AttributeValueBase::__construct	public	function	Constructs a \Drupal\Core\Template\AttributeValueBase object.